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C# SqlHelper

發(fā)布日期:2022/8/31 作者: 瀏覽:1317
using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
using System.Configuration;
using WinDPAPI;
using System.Text;


//如果要獲取連接數(shù)據(jù)連接對象或字符串的話,先要修改SQLHelper類中GetConnSting() 方法中的ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;才能調(diào)用。
namespace DAL
{
    /// <summary> 
    /// SqlServer數(shù)據(jù)訪問幫助類 
    /// </summary> 
    public sealed class SqlHelper
    {
        #region 私有構(gòu)造函數(shù)和方法

        private SqlHelper() { }

        /// <summary> 
        /// 將SqlParameter參數(shù)數(shù)組(參數(shù)值)分配給SqlCommand命令. 
        /// 這個(gè)方法將給任何一個(gè)參數(shù)分配DBNull.Value; 
        /// 該操作將阻止默認(rèn)值的使用. 
        /// </summary> 
        /// <param name="command">命令名</param> 
        /// <param name="commandParameters">SqlParameters數(shù)組</param> 
        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
        {
            if (command == null) throw new ArgumentNullException("command");
            if (commandParameters != null)
            {
                foreach (SqlParameter p in commandParameters)
                {
                    if (p != null)
                    {
                        // 檢查未分配值的輸出參數(shù),將其分配以DBNull.Value. 
                        if ((p.Direction == ParameterDirection.InputOutput || p.Direction == ParameterDirection.Input) &&
                            (p.Value == null))
                        {
                            p.Value = DBNull.Value;
                        }
                        command.Parameters.Add(p);
                    }
                }
            }
        }

        /// <summary> 
        /// 將DataRow類型的列值分配到SqlParameter參數(shù)數(shù)組. 
        /// </summary> 
        /// <param name="commandParameters">要分配值的SqlParameter參數(shù)數(shù)組</param> 
        /// <param name="dataRow">將要分配給存儲過程參數(shù)的DataRow</param> 
        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
        {
            if ((commandParameters == null) || (dataRow == null))
            {
                return;
            }

            int i = 0;
            // 設(shè)置參數(shù)值 
            foreach (SqlParameter commandParameter in commandParameters)
            {
                // 創(chuàng)建參數(shù)名稱,如果不存在,只拋出一個(gè)異常. 
                if (commandParameter.ParameterName == null ||
                    commandParameter.ParameterName.Length <= 1)
                    throw new Exception(
                        string.Format("請?zhí)峁﹨?shù){0}一個(gè)有效的名稱{1}.", i, commandParameter.ParameterName));
                // 從dataRow的表中獲取為參數(shù)數(shù)組中數(shù)組名稱的列的索引. 
                // 如果存在和參數(shù)名稱相同的列,則將列值賦給當(dāng)前名稱的參數(shù). 
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                i++;
            }
        }

        /// <summary> 
        /// 將一個(gè)對象數(shù)組分配給SqlParameter參數(shù)數(shù)組. 
        /// </summary> 
        /// <param name="commandParameters">要分配值的SqlParameter參數(shù)數(shù)組</param> 
        /// <param name="parameterValues">將要分配給存儲過程參數(shù)的對象數(shù)組</param> 
        private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
            {
                return;
            }

            // 確保對象數(shù)組個(gè)數(shù)與參數(shù)個(gè)數(shù)匹配,如果不匹配,拋出一個(gè)異常. 
            if (commandParameters.Length != parameterValues.Length)
            {
                throw new ArgumentException("參數(shù)值個(gè)數(shù)與參數(shù)不匹配.");
            }

            // 給參數(shù)賦值 
            for (int i = 0, j = commandParameters.Length; i < j; i++)
            {
                // If the current array value derives from IDbDataParameter, then assign its Value property 
                if (parameterValues[i] is IDbDataParameter)
                {
                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
                    if (paramInstance.Value == null)
                    {
                        commandParameters[i].Value = DBNull.Value;
                    }
                    else
                    {
                        commandParameters[i].Value = paramInstance.Value;
                    }
                }
                else if (parameterValues[i] == null)
                {
                    commandParameters[i].Value = DBNull.Value;
                }
                else
                {
                    commandParameters[i].Value = parameterValues[i];
                }
            }
        }

        /// <summary> 
        /// 預(yù)處理用戶提供的命令,數(shù)據(jù)庫連接/事務(wù)/命令類型/參數(shù) 
        /// </summary> 
        /// <param name="command">要處理的SqlCommand</param> 
        /// <param name="connection">數(shù)據(jù)庫連接</param> 
        /// <param name="transaction">一個(gè)有效的事務(wù)或者是null值</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param> 
        /// <param name="commandText">存儲過程名或都T-SQL命令文本</param> 
        /// <param name="commandParameters">和命令相關(guān)聯(lián)的SqlParameter參數(shù)數(shù)組,如果沒有參數(shù)為'null'</param> 
        /// <param name="mustCloseConnection"><c>true</c> 如果連接是打開的,則為true,其它情況下為false.</param> 
        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
        {
            if (command == null) throw new ArgumentNullException("command");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            // If the provided connection is not open, we will open it 
            if (connection.State != ConnectionState.Open)
            {
                mustCloseConnection = true;
                connection.Open();
            }
            else
            {
                mustCloseConnection = false;
            }

            // 給命令分配一個(gè)數(shù)據(jù)庫連接. 
            command.Connection = connection;

            // 設(shè)置命令文本(存儲過程名或SQL語句) 
            command.CommandText = commandText;

            // 分配事務(wù) 
            if (transaction != null)
            {
                if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
                command.Transaction = transaction;
            }

            // 設(shè)置命令類型. 
            command.CommandType = commandType;

            // 分配命令參數(shù) 
            if (commandParameters != null)
            {
                AttachParameters(command, commandParameters);
            }
            return;
        }

        #endregion 私有構(gòu)造函數(shù)和方法結(jié)束

        #region 數(shù)據(jù)庫連接
        /// <summary> 
        /// 一個(gè)有效的數(shù)據(jù)庫連接字符串 
        /// </summary> 
        /// <returns></returns> 
        public static string GetConnSting()
        {
            DataProtector dp = new DataProtector(DataProtector.Store.USE_MACHINE_STORE);
            byte[] dataToDecrypt = Convert.FromBase64String(ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString);
            // Optional entropy parameter is null.
            // If entropy was used within the Encrypt method, the same entropy parameter
            // must be supplied here
            return Encoding.UTF8.GetString(dp.Decrypt(dataToDecrypt, null));
            //return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString;
        }
        /// <summary> 
        /// 一個(gè)有效的數(shù)據(jù)庫連接對象 
        /// </summary> 
        /// <returns></returns> 
        public static SqlConnection GetConnection()
        {
            SqlConnection Connection = new SqlConnection(SqlHelper.GetConnSting());
            return Connection;
        }
        #endregion

        #region ExecuteNonQuery命令

        /// <summary> 
        /// 執(zhí)行指定連接字符串,類型的SqlCommand. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders"); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param> 
        /// <param name="commandText">存儲過程名稱或SQL語句</param> 
        /// <returns>返回命令影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定連接字符串,類型的SqlCommand.如果沒有提供參數(shù),不返回結(jié)果. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本, 其它.)</param> 
        /// <param name="commandText">存儲過程名稱或SQL語句</param> 
        /// <param name="commandParameters">SqlParameter參數(shù)數(shù)組</param> 
        /// <returns>返回命令影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接字符串的存儲過程,將對象數(shù)組的值賦給存儲過程參數(shù), 
        /// 此方法需要在參數(shù)緩存方法中探索參數(shù)并生成參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 這個(gè)方法沒有提供訪問輸出參數(shù)和返回值. 
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串/param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配到存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回受影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果存在參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從探索存儲過程參數(shù)(加載到緩存)并分配給存儲過程參數(shù)數(shù)組. 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)情況下 
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param> 
        /// <param name="commandText">T存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // Finally, execute the command 
            int retval = cmd.ExecuteNonQuery();

            // 清除參數(shù),以便再次使用. 
            cmd.Parameters.Clear();
            if (mustCloseConnection)
                connection.Close();
            return retval;
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,將對象數(shù)組的值賦給存儲過程參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù) 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程分配參數(shù)值 
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行帶事務(wù)的SqlCommand. 
        /// </summary> 
        /// <remarks> 
        /// 示例.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回影響的行數(shù)/returns> 
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行帶事務(wù)的SqlCommand(指定參數(shù)). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型(存儲過程,命令文本或其它.)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執(zhí)行 
            int retval = cmd.ExecuteNonQuery();

            // 清除參數(shù)集,以便再次使用. 
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary> 
        /// 執(zhí)行帶事務(wù)的SqlCommand(指定參數(shù)值). 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回受影響的行數(shù)</returns> 
        public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteNonQuery方法結(jié)束

        #region ExecuteDataset方法

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例: 
        ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamters參數(shù)數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

            // 創(chuàng)建并打開數(shù)據(jù)庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調(diào)用指定數(shù)據(jù)庫連接字符串重載方法. 
                return ExecuteDataset(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,直接提供參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值. 
        /// 示例: 
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中檢索存儲過程參數(shù) 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數(shù)分配值 
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,指定存儲過程參數(shù),返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // 創(chuàng)建SqlDataAdapter和DataSet. 
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();

                // 填充DataSet. 
                da.Fill(ds);

                cmd.Parameters.Clear();

                if (mustCloseConnection)
                    connection.Close();

                return ds;
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,指定參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸入?yún)?shù)和返回值. 
        /// 示例.:  
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 比緩存中加載存儲過程參數(shù) 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數(shù)分配值 
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定事務(wù)的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定事務(wù)的命令,指定參數(shù),返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 創(chuàng)建 DataAdapter & DataSet 
            using (SqlDataAdapter da = new SqlDataAdapter(cmd))
            {
                DataSet ds = new DataSet();
                da.Fill(ds);
                cmd.Parameters.Clear();
                return ds;
            }
        }

        /// <summary> 
        /// 執(zhí)行指定事務(wù)的命令,指定參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸入?yún)?shù)和返回值. 
        /// 示例.:  
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">事務(wù)</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù) 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數(shù)分配值 
                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteDataset數(shù)據(jù)集命令結(jié)束

        #region ExecuteReader 數(shù)據(jù)閱讀器

        /// <summary> 
        /// 枚舉,標(biāo)識數(shù)據(jù)庫連接是由SqlHelper提供還是由調(diào)用者提供 
        /// </summary> 
        private enum SqlConnectionOwnership
        {
            /// <summary>由SqlHelper提供連接</summary> 
            Internal,
            /// <summary>由調(diào)用者提供連接</summary> 
            External
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的數(shù)據(jù)閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 如果是SqlHelper打開連接,當(dāng)連接關(guān)閉DataReader也將關(guān)閉. 
        /// 如果是調(diào)用都打開連接,DataReader由調(diào)用都管理. 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="transaction">一個(gè)有效的事務(wù),或者為 'null'</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParameters參數(shù)數(shù)組,如果沒有參數(shù)則為'null'</param> 
        /// <param name="connectionOwnership">標(biāo)識數(shù)據(jù)庫連接對象是由調(diào)用者提供還是由SqlHelper提供</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            bool mustCloseConnection = false;
            // 創(chuàng)建命令 
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // 創(chuàng)建數(shù)據(jù)閱讀器 
                SqlDataReader dataReader;

                if (connectionOwnership == SqlConnectionOwnership.External)
                {
                    dataReader = cmd.ExecuteReader();
                }
                else
                {
                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
                }

                // 清除參數(shù),以便再次使用.. 
                // HACK: There is a problem here, the output parameter values are fletched 
                // when the reader is closed, so if the parameters are detached from the command 
                // then the SqlReader can磘 set its values. 
                // When this happen, the parameters can磘 be used again in other command. 
                bool canClear = true;
                foreach (SqlParameter commandParameter in cmd.Parameters)
                {
                    if (commandParameter.Direction != ParameterDirection.Input)
                        canClear = false;
                }

                if (canClear)
                {
                    cmd.Parameters.Clear();
                }

                return dataReader;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的數(shù)據(jù)閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
        {
            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的數(shù)據(jù)閱讀器,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組(new SqlParameter("@prodid", 24))</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            SqlConnection connection = null;
            try
            {
                connection = new SqlConnection(connectionString);
                connection.Open();

                return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch
            {
                // If we fail to return the SqlDatReader, we need to close the connection ourselves 
                if (connection != null) connection.Close();
                throw;
            }

        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的數(shù)據(jù)閱讀器,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的數(shù)據(jù)閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名或T-SQL語句</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// [調(diào)用者方式]執(zhí)行指定數(shù)據(jù)庫連接對象的數(shù)據(jù)閱讀器,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandParameters">SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary> 
        /// [調(diào)用者方式]執(zhí)行指定數(shù)據(jù)庫連接對象的數(shù)據(jù)閱讀器,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">T存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// [調(diào)用者方式]執(zhí)行指定數(shù)據(jù)庫事務(wù)的數(shù)據(jù)閱讀器,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// [調(diào)用者方式]執(zhí)行指定數(shù)據(jù)庫事務(wù)的數(shù)據(jù)閱讀器,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

        /// <summary> 
        /// [調(diào)用者方式]執(zhí)行指定數(shù)據(jù)庫事務(wù)的數(shù)據(jù)閱讀器,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteReader數(shù)據(jù)閱讀器

        #region ExecuteScalar 返回結(jié)果集中的第一行第一列

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount"); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            // 執(zhí)行參數(shù)為空的方法 
            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,指定參數(shù),返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            // 創(chuàng)建并打開數(shù)據(jù)庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調(diào)用指定數(shù)據(jù)庫連接字符串重載方法. 
                return ExecuteScalar(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,指定參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
        {
            // 執(zhí)行參數(shù)為空的方法 
            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,指定參數(shù),返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand cmd = new SqlCommand();

            bool mustCloseConnection = false;
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執(zhí)行SqlCommand命令,并返回結(jié)果. 
            object retval = cmd.ExecuteScalar();

            // 清除參數(shù),以便再次使用. 
            cmd.Parameters.Clear();

            if (mustCloseConnection)
                connection.Close();

            return retval;
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,指定參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount"); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            // 執(zhí)行參數(shù)為空的方法 
            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,指定參數(shù),返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執(zhí)行SqlCommand命令,并返回結(jié)果. 
            object retval = cmd.ExecuteScalar();

            // 清除參數(shù),以便再次使用. 
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,指定參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // PPull the parameters for this stored procedure from the parameter cache () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteScalar

        #region ExecuteXmlReader XML閱讀器
        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
        {
            // 執(zhí)行參數(shù)為空的方法 
            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");

            bool mustCloseConnection = false;
            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            try
            {
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

                // 執(zhí)行命令 
                XmlReader retval = cmd.ExecuteXmlReader();

                // 清除參數(shù),以便再次使用. 
                cmd.Parameters.Clear();

                return retval;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱 using "FOR XML AUTO"</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            // 執(zhí)行參數(shù)為空的方法 
            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句 using "FOR XML AUTO"</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand cmd = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執(zhí)行命令 
            XmlReader retval = cmd.ExecuteXmlReader();

            // 清除參數(shù),以便再次使用. 
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的SqlCommand命令,并產(chǎn)生一個(gè)XmlReader對象做為結(jié)果集返回,指定參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet.</returns> 
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteXmlReader 閱讀器結(jié)束

        #region FillDataset 填充數(shù)據(jù)集
        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.)</param> 
        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // 創(chuàng)建并打開數(shù)據(jù)庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調(diào)用指定數(shù)據(jù)庫連接字符串重載方法. 
                FillDataset(connection, commandType, commandText, dataSet, tableNames);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集.指定命令參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        public static void FillDataset(string connectionString, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // 創(chuàng)建并打開數(shù)據(jù)庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調(diào)用指定數(shù)據(jù)庫連接字符串重載方法. 
                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接字符串的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,指定存儲過程參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24); 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param>    
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        public static void FillDataset(string connectionString, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            // 創(chuàng)建并打開數(shù)據(jù)庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                // 調(diào)用指定數(shù)據(jù)庫連接字符串重載方法. 
                FillDataset(connection, spName, dataSet, tableNames, parameterValues);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param>    
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames)
        {
            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        public static void FillDataset(SqlConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫連接對象的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,指定存儲過程參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        public static void FillDataset(SqlConnection connection, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText,
            DataSet dataSet, string[] tableNames)
        {
            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,指定參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        public static void FillDataset(SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary> 
        /// 執(zhí)行指定數(shù)據(jù)庫事務(wù)的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,指定存儲過程參數(shù)值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數(shù)和返回值參數(shù). 
        /// 
        /// 示例:  
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        /// <param name="parameterValues">分配給存儲過程輸入?yún)?shù)的對象數(shù)組</param> 
        public static void FillDataset(SqlTransaction transaction, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (dataSet == null) throw new ArgumentNullException("dataSet");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果有參數(shù)值 
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 給存儲過程參數(shù)賦值 
                AssignParameterValues(commandParameters, parameterValues);

                // 調(diào)用重載方法 
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
            {
                // 沒有參數(shù)值 
                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
            }
        }

        /// <summary> 
        /// [私有方法][內(nèi)部調(diào)用]執(zhí)行指定數(shù)據(jù)庫連接對象/事務(wù)的命令,映射數(shù)據(jù)表并填充數(shù)據(jù)集,DataSet/TableNames/SqlParameters. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù)</param> 
        /// <param name="commandType">命令類型 (存儲過程,命令文本或其它)</param> 
        /// <param name="commandText">存儲過程名稱或T-SQL語句</param> 
        /// <param name="dataSet">要填充結(jié)果集的DataSet實(shí)例</param> 
        /// <param name="tableNames">表映射的數(shù)據(jù)表數(shù)組 
        /// 用戶定義的表名 (可有是實(shí)際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數(shù)數(shù)組</param> 
        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params SqlParameter[] commandParameters)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (dataSet == null) throw new ArgumentNullException("dataSet");

            // 創(chuàng)建SqlCommand命令,并進(jìn)行預(yù)處理 
            SqlCommand command = new SqlCommand();
            bool mustCloseConnection = false;
            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執(zhí)行命令 
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
            {

                // 追加表映射 
                if (tableNames != null && tableNames.Length > 0)
                {
                    string tableName = "Table";
                    for (int index = 0; index < tableNames.Length; index++)
                    {
                        if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                        tableName += (index + 1).ToString();
                    }
                }

                // 填充數(shù)據(jù)集使用默認(rèn)表名稱 
                dataAdapter.Fill(dataSet);

                // 清除參數(shù),以便再次使用. 
                command.Parameters.Clear();
            }

            if (mustCloseConnection)
                connection.Close();
        }
        #endregion

        #region UpdateDataset 更新數(shù)據(jù)集
        /// <summary> 
        /// 執(zhí)行數(shù)據(jù)集更新到數(shù)據(jù)庫,指定inserted, updated, or deleted命令. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order"); 
        /// </remarks> 
        /// <param name="insertCommand">[追加記錄]一個(gè)有效的T-SQL語句或存儲過程</param> 
        /// <param name="deleteCommand">[刪除記錄]一個(gè)有效的T-SQL語句或存儲過程</param> 
        /// <param name="updateCommand">[更新記錄]一個(gè)有效的T-SQL語句或存儲過程</param> 
        /// <param name="dataSet">要更新到數(shù)據(jù)庫的DataSet</param> 
        /// <param name="tableName">要更新到數(shù)據(jù)庫的DataTable</param> 
        public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
        {
            if (insertCommand == null) throw new ArgumentNullException("insertCommand");
            if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
            if (updateCommand == null) throw new ArgumentNullException("updateCommand");
            if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

            // 創(chuàng)建SqlDataAdapter,當(dāng)操作完成后釋放. 
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
            {
                // 設(shè)置數(shù)據(jù)適配器命令 
                dataAdapter.UpdateCommand = updateCommand;
                dataAdapter.InsertCommand = insertCommand;
                dataAdapter.DeleteCommand = deleteCommand;

                // 更新數(shù)據(jù)集改變到數(shù)據(jù)庫 
                dataAdapter.Update(dataSet, tableName);

                // 提交所有改變到數(shù)據(jù)集. 
                dataSet.AcceptChanges();
            }
        }
        #endregion

        #region CreateCommand 創(chuàng)建一條SqlCommand命令
        /// <summary> 
        /// 創(chuàng)建SqlCommand命令,指定數(shù)據(jù)庫連接對象,存儲過程名和參數(shù). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName"); 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="sourceColumns">源表的列名稱數(shù)組</param> 
        /// <returns>返回SqlCommand命令</returns> 
        public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 創(chuàng)建命令 
            SqlCommand cmd = new SqlCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;

            // 如果有參數(shù)值 
            if ((sourceColumns != null) && (sourceColumns.Length > 0))
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 將源表的列到映射到DataSet命令中. 
                for (int index = 0; index < sourceColumns.Length; index++)
                    commandParameters[index].SourceColumn = sourceColumns[index];

                // Attach the discovered parameters to the SqlCommand object 
                AttachParameters(cmd, commandParameters);
            }

            return cmd;
        }
        #endregion

        #region ExecuteNonQueryTypedParams 類型化參數(shù)(DataRow)
        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接字符串的存儲過程,使用DataRow做為參數(shù)值,返回受影響的行數(shù). 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接對象的存儲過程,使用DataRow做為參數(shù)值,返回受影響的行數(shù). 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫事物的存儲過程,使用DataRow做為參數(shù)值,返回受影響的行數(shù). 
        /// </summary> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù) object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回影響的行數(shù)</returns> 
        public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // Sf the row has values, the store procedure parameters must be initialized 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteDatasetTypedParams 類型化參數(shù)(DataRow)
        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接字符串的存儲過程,使用DataRow做為參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet.</returns> 
        public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            //如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接對象的存儲過程,使用DataRow做為參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet.</returns> 
        /// 
        public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫事務(wù)的存儲過程,使用DataRow做為參數(shù)值,返回DataSet. 
        /// </summary> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù) object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回一個(gè)包含結(jié)果集的DataSet.</returns> 
        public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion

        #region ExecuteReaderTypedParams 類型化參數(shù)(DataRow)
        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接字符串的存儲過程,使用DataRow做為參數(shù)值,返回DataReader. 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }


        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接對象的存儲過程,使用DataRow做為參數(shù)值,返回DataReader. 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫事物的存儲過程,使用DataRow做為參數(shù)值,返回DataReader. 
        /// </summary> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù) object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回包含結(jié)果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteScalarTypedParams 類型化參數(shù)(DataRow)
        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接字符串的存儲過程,使用DataRow做為參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接對象的存儲過程,使用DataRow做為參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫事務(wù)的存儲過程,使用DataRow做為參數(shù)值,返回結(jié)果集中的第一行第一列. 
        /// </summary> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù) object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回結(jié)果集中的第一行第一列</returns> 
        public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion

        #region ExecuteXmlReaderTypedParams 類型化參數(shù)(DataRow)
        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫連接對象的存儲過程,使用DataRow做為參數(shù)值,返回XmlReader類型的結(jié)果集. 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
            }
        }

        /// <summary> 
        /// 執(zhí)行指定連接數(shù)據(jù)庫事務(wù)的存儲過程,使用DataRow做為參數(shù)值,返回XmlReader類型的結(jié)果集. 
        /// </summary> 
        /// <param name="transaction">一個(gè)有效的連接事務(wù) object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數(shù)值</param> 
        /// <returns>返回XmlReader結(jié)果集對象.</returns> 
        public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null) throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            // 如果row有值,存儲過程必須初始化. 
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // 從緩存中加載存儲過程參數(shù),如果緩存中不存在則從數(shù)據(jù)庫中檢索參數(shù)信息并加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數(shù)值 
                AssignParameterValues(commandParameters, dataRow);

                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            else
            {
                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
            }
        }
        #endregion


        #region 執(zhí)行事務(wù)日志

        ///// <summary>
        ///// 執(zhí)行多條SQL語句,實(shí)現(xiàn)數(shù)據(jù)庫事務(wù)。
        ///// </summary>
        ///// <param name="SQLStringList">多條SQL語句</param>  
        //public static bool ExecuteSqlTran(string[] SQLStringList)
        //{
        //    SqlCommand cmd = new SqlCommand();
        //    SqlConnection Connection = new SqlConnection(GetConnSting());
        //    cmd.Connection = Connection;
        //    SqlTransaction tx = Connection.BeginTransaction();
        //    cmd.Transaction = tx;
        //    try
        //    {
        //        for (int n = 0; n < SQLStringList.Length; n++)
        //        {
        //            string strsql = SQLStringList[n].ToString();
        //            if (strsql.Trim().Length > 1)
        //            {
        //                cmd.CommandText = strsql;
        //                cmd.ExecuteNonQuery();
        //            }
        //        }
        //        tx.Commit();
        //        return true;
        //    }
        //    catch (System.Data.SqlClient.SqlException E)
        //    {
        //        tx.Rollback();
        //        throw new Exception(E.Message);
        //    }
        //}
        #endregion
    }

    /// <summary> 
    /// SqlHelperParameterCache提供緩存存儲過程參數(shù),并能夠在運(yùn)行時(shí)從存儲過程中探索參數(shù). 
    /// </summary> 
    public sealed class SqlHelperParameterCache
    {
        #region 私有方法,字段,構(gòu)造函數(shù)
        // 私有構(gòu)造函數(shù),妨止類被實(shí)例化. 
        private SqlHelperParameterCache() { }

        // 這個(gè)方法要注意 
        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

        /// <summary> 
        /// 探索運(yùn)行時(shí)的存儲過程,返回SqlParameter參數(shù)數(shù)組. 
        /// 初始化參數(shù)值為 DBNull.Value. 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數(shù)</param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            SqlCommand cmd = new SqlCommand(spName, connection);
            cmd.CommandType = CommandType.StoredProcedure;

            connection.Open();
            // 檢索cmd指定的存儲過程的參數(shù)信息,并填充到cmd的Parameters參數(shù)集中. 
            SqlCommandBuilder.DeriveParameters(cmd);
            connection.Close();
            // 如果不包含返回值參數(shù),將參數(shù)集中的每一個(gè)參數(shù)刪除. 
            if (!includeReturnValueParameter)
            {
                cmd.Parameters.RemoveAt(0);
            }

            // 創(chuàng)建參數(shù)數(shù)組 
            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];
            // 將cmd的Parameters參數(shù)集復(fù)制到discoveredParameters數(shù)組. 
            cmd.Parameters.CopyTo(discoveredParameters, 0);

            // 初始化參數(shù)值為 DBNull.Value. 
            foreach (SqlParameter discoveredParameter in discoveredParameters)
            {
                discoveredParameter.Value = DBNull.Value;
            }
            return discoveredParameters;
        }

        /// <summary> 
        /// SqlParameter參數(shù)數(shù)組的深層拷貝. 
        /// </summary> 
        /// <param name="originalParameters">原始參數(shù)數(shù)組</param> 
        /// <returns>返回一個(gè)同樣的參數(shù)數(shù)組</returns> 
        private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
        {
            SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

            for (int i = 0, j = originalParameters.Length; i < j; i++)
            {
                clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
            }

            return clonedParameters;
        }

        #endregion 私有方法,字段,構(gòu)造函數(shù)結(jié)束

        #region 緩存方法

        /// <summary> 
        /// 追加參數(shù)數(shù)組到緩存. 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符串</param> 
        /// <param name="commandText">存儲過程名或SQL語句</param> 
        /// <param name="commandParameters">要緩存的參數(shù)數(shù)組</param> 
        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            string hashKey = connectionString + ":" + commandText;

            paramCache[hashKey] = commandParameters;
        }

        /// <summary> 
        /// 從緩存中獲取參數(shù)數(shù)組. 
        /// </summary> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符</param> 
        /// <param name="commandText">存儲過程名或SQL語句</param> 
        /// <returns>參數(shù)數(shù)組</returns> 
        public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

            string hashKey = connectionString + ":" + commandText;

            SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
            if (cachedParameters == null)
            {
                return null;
            }
            else
            {
                return CloneParameters(cachedParameters);
            }
        }

        #endregion 緩存方法結(jié)束

        #region 檢索指定的存儲過程的參數(shù)集

        /// <summary> 
        /// 返回指定的存儲過程的參數(shù)集 
        /// </summary> 
        /// <remarks> 
        /// 這個(gè)方法將查詢數(shù)據(jù)庫,并將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
        {
            return GetSpParameterSet(connectionString, spName, false);
        }

        /// <summary> 
        /// 返回指定的存儲過程的參數(shù)集 
        /// </summary> 
        /// <remarks> 
        /// 這個(gè)方法將查詢數(shù)據(jù)庫,并將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connectionString">一個(gè)有效的數(shù)據(jù)庫連接字符.</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數(shù)</param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
            }
        }

        /// <summary> 
        /// [內(nèi)部]返回指定的存儲過程的參數(shù)集(使用連接對象). 
        /// </summary> 
        /// <remarks> 
        /// 這個(gè)方法將查詢數(shù)據(jù)庫,并將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接字符</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
        {
            return GetSpParameterSet(connection, spName, false);
        }

        /// <summary> 
        /// [內(nèi)部]返回指定的存儲過程的參數(shù)集(使用連接對象) 
        /// </summary> 
        /// <remarks> 
        /// 這個(gè)方法將查詢數(shù)據(jù)庫,并將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter"> 
        /// 是否包含返回值參數(shù) 
        /// </param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
            {
                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
            }
        }

        /// <summary> 
        /// [私有]返回指定的存儲過程的參數(shù)集(使用連接對象) 
        /// </summary> 
        /// <param name="connection">一個(gè)有效的數(shù)據(jù)庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數(shù)</param> 
        /// <returns>返回SqlParameter參數(shù)數(shù)組</returns> 
        private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
        {
            if (connection == null) throw new ArgumentNullException("connection");
            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");

            SqlParameter[] cachedParameters;

            cachedParameters = paramCache[hashKey] as SqlParameter[];
            if (cachedParameters == null)
            {
                SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                paramCache[hashKey] = spParameters;
                cachedParameters = spParameters;
            }

            return CloneParameters(cachedParameters);
        }

        #endregion 參數(shù)集檢索結(jié)束

    }
}


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