微軟SQLHelper.cs類 中文版

using System; 
using System.Data; 
using System.Xml; 
using System.Data.SqlClient; 
using System.Collections; 
using System.Configuration;

namespace BookDAL 
{ 
    /// <summary> 
    /// SqlServer數據訪問幫助類 
    /// </summary> 
    public sealed class SqlHelper 
    { 
        #region 私有構造函數和方法

        private SqlHelper() { }

        /// <summary> 
        /// 將SqlParameter參數數組(參數值)分配給SqlCommand命令. 
        /// 這個方法將給任何一個參數分配DBNull.Value; 
        /// 該操作將阻止默認值的使用. 
        /// </summary> 
        /// <param name="command">命令名</param> 
        /// <param name="commandParameters">SqlParameters數組</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,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參數數組. 
        /// </summary> 
        /// <param name="commandParameters">要分配值的SqlParameter參數數組</param> 
        /// <param name="dataRow">將要分配給存儲過程參數的DataRow</param> 
        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow) 
        { 
            if ((commandParameters == null) || (dataRow == null)) 
            { 
                return; 
            }

            int i = 0; 
            // 設置參數值 
            foreach (SqlParameter commandParameter in commandParameters) 
            { 
                // 創建參數名稱,如果不存在,只拋出一個異常. 
                if (commandParameter.ParameterName == null || 
                    commandParameter.ParameterName.Length <= 1) 
                    throw new Exception( 
                        string.Format("請提供參數{0}一個有效的名稱{1}.", i, commandParameter.ParameterName)); 
                // 從dataRow的表中獲取為參數數組中數組名稱的列的索引. 
                // 如果存在和參數名稱相同的列,則將列值賦給當前名稱的參數. 
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1) 
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)]; 
                i++; 
            } 
        }

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

            // 確保對象數組個數與參數個數匹配,如果不匹配,拋出一個異常. 
            if (commandParameters.Length != parameterValues.Length) 
            { 
                throw new ArgumentException("參數值個數與參數不匹配."); 
            }

            // 給參數賦值 
            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> 
        /// 預處理用戶提供的命令,數據庫連接/事務/命令類型/參數 
        /// </summary> 
        /// <param name="command">要處理的SqlCommand</param> 
        /// <param name="connection">數據庫連接</param> 
        /// <param name="transaction">一個有效的事務或者是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">和命令相關聯的SqlParameter參數數組,如果沒有參數為'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; 
            }

            // 給命令分配一個數據庫連接. 
            command.Connection = connection;

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

            // 分配事務 
            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; 
            }

            // 設置命令類型. 
            command.CommandType = commandType;

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

        #endregion 私有構造函數和方法結束

        #region 數據庫連接 
        /// <summary> 
        /// 一個有效的數據庫連接字符串 
        /// </summary> 
        /// <returns></returns> 
        public static string GetConnSting() 
        { 
            return ConfigurationManager.ConnectionStrings["ConStr"].ConnectionString; 
        } 
        /// <summary> 
        /// 一個有效的數據庫連接對象 
        /// </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">一個有效的數據庫連接字符串</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</returns> 
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText) 
        { 
            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定連接字符串,類型的SqlCommand.如果沒有提供參數,不返回結果. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</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參數數組</param> 
        /// <returns>返回命令影響的行數</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> 
        /// 執行指定連接字符串的存儲過程,將對象數組的值賦給存儲過程參數, 
        /// 此方法需要在參數緩存方法中探索參數並生成參數. 
        /// </summary> 
        /// <remarks> 
        /// 這個方法沒有提供訪問輸出參數和返回值. 
        /// 示例:  
        ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串/param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配到存儲過程輸入參數的對象數組</param> 
        /// <returns>返回受影響的行數</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");

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

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

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

        /// <summary> 
        /// 執行指定數據庫連接對象的命令 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders"); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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</returns> 
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText) 
        { 
            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回影響的行數</returns> 
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters) 
        { 
            if (connection == null) throw new ArgumentNullException("connection");

            // 創建SqlCommand命令,並進行預處理 
            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,以便再次使用. 
            cmd.Parameters.Clear(); 
            if (mustCloseConnection) 
                connection.Close(); 
            return retval; 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,將對象數組的值賦給存儲過程參數. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回影響的行數</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");

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

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

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

        /// <summary> 
        /// 執行帶事務的SqlCommand. 
        /// </summary> 
        /// <remarks> 
        /// 示例.:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個有效的數據庫連接對象</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/returns> 
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText) 
        { 
            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行帶事務的SqlCommand(指定參數). 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回影響的行數</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");

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

            // 執行 
            int retval = cmd.ExecuteNonQuery();

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

        /// <summary> 
        /// 執行帶事務的SqlCommand(指定參數值). 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值 
        /// 示例:  
        ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回受影響的行數</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");

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

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

                // 調用重載方法 
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName); 
            } 
        }

        #endregion ExecuteNonQuery方法結束

        #region ExecuteDataset方法

        /// <summary> 
        /// 執行指定數據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">一個有效的數據庫連接字符串</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>返回一個包含結果集的DataSet</returns> 
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText) 
        { 
            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據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">一個有效的數據庫連接字符串</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參數數組</param> 
        /// <returns>返回一個包含結果集的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");

            // 創建並打開數據庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString)) 
            { 
                connection.Open();

                // 調用指定數據庫連接字符串重載方法. 
                return ExecuteDataset(connection, commandType, commandText, commandParameters); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,直接提供參數值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值. 
        /// 示例: 
        ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回一個包含結果集的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 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

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

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

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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>返回一個包含結果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText) 
        { 
            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,指定存儲過程參數,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回一個包含結果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters) 
        { 
            if (connection == null) throw new ArgumentNullException("connection");

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

            // 創建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> 
        /// 執行指定數據庫連接對象的命令,指定參數值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸入參數和返回值. 
        /// 示例.:  
        ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回一個包含結果集的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 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

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

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

        /// <summary> 
        /// 執行指定事務的命令,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">事務</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>返回一個包含結果集的DataSet</returns> 
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText) 
        { 
            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定事務的命令,指定參數,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">事務</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參數數組</param> 
        /// <returns>返回一個包含結果集的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");

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

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

        /// <summary> 
        /// 執行指定事務的命令,指定參數值,返回DataSet. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸入參數和返回值. 
        /// 示例.:  
        ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">事務</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回一個包含結果集的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 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

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

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

        #endregion ExecuteDataset數據集命令結束

        #region ExecuteReader 數據閱讀器

        /// <summary> 
        /// 枚舉,標識數據庫連接是由SqlHelper提供還是由調用者提供 
        /// </summary> 
        private enum SqlConnectionOwnership 
        { 
            /// <summary>由SqlHelper提供連接</summary> 
            Internal, 
            /// <summary>由調用者提供連接</summary> 
            External 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的數據閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 如果是SqlHelper打開連接,當連接關閉DataReader也將關閉. 
        /// 如果是調用都打開連接,DataReader由調用都管理. 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="transaction">一個有效的事務,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參數數組,如果沒有參數則為'null'</param> 
        /// <param name="connectionOwnership">標識數據庫連接對象是由調用者提供還是由SqlHelper提供</param> 
        /// <returns>返回包含結果集的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; 
            // 創建命令 
            SqlCommand cmd = new SqlCommand(); 
            try 
            { 
                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

                // 創建數據閱讀器 
                SqlDataReader dataReader;

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

                // 清除參數,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> 
        /// 執行指定數據庫連接字符串的數據閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</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>返回包含結果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText) 
        { 
            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的數據閱讀器,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</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參數數組(new SqlParameter("@prodid", 24))</param> 
        /// <returns>返回包含結果集的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> 
        /// 執行指定數據庫連接字符串的數據閱讀器,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回包含結果集的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> 
        /// 執行指定數據庫連接對象的數據閱讀器. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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>返回包含結果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText) 
        { 
            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// [調用者方式]執行指定數據庫連接對象的數據閱讀器,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回包含結果集的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> 
        /// [調用者方式]執行指定數據庫連接對象的數據閱讀器,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">T存儲過程名</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回包含結果集的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> 
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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>返回包含結果集的SqlDataReader</returns> 
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText) 
        { 
            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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參數數組</param> 
        /// <returns>返回包含結果集的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> 
        /// [調用者方式]執行指定數據庫事務的數據閱讀器,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回包含結果集的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 
            { 
                // 沒有參數值 
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName); 
            } 
        }

        #endregion ExecuteReader數據閱讀器

        #region ExecuteScalar 返回結果集中的第一行第一列

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,返回結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">一個有效的數據庫連接字符串</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>返回結果集中的第一行第一列</returns> 
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText) 
        { 
            // 執行參數為空的方法 
            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,指定參數,返回結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">一個有效的數據庫連接字符串</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參數數組</param> 
        /// <returns>返回結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"); 
            // 創建並打開數據庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString)) 
            { 
                connection.Open();

                // 調用指定數據庫連接字符串重載方法. 
                return ExecuteScalar(connection, commandType, commandText, commandParameters); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,指定參數值,返回結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和返回值參數. 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回結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");

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

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

                // 調用重載方法 
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,返回結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">一個有效的數據庫連接對象</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>返回結果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText) 
        { 
            // 執行參數為空的方法 
            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,指定參數,返回結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">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回結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");

            // 創建SqlCommand命令,並進行預處理 
            SqlCommand cmd = new SqlCommand();

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

            // 執行SqlCommand命令,並返回結果. 
            object retval = cmd.ExecuteScalar();

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

            if (mustCloseConnection) 
                connection.Close();

            return retval; 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,指定參數值,返回結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和返回值參數. 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回結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");

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

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

                // 調用重載方法 
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫事務的命令,返回結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">一個有效的連接事務</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>返回結果集中的第一行第一列</returns> 
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText) 
        { 
            // 執行參數為空的方法 
            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫事務的命令,指定參數,返回結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">一個有效的連接事務</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參數數組</param> 
        /// <returns>返回結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");

            // 創建SqlCommand命令,並進行預處理 
            SqlCommand cmd = new SqlCommand(); 
            bool mustCloseConnection = false; 
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行SqlCommand命令,並返回結果. 
            object retval = cmd.ExecuteScalar();

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

        /// <summary> 
        /// 執行指定數據庫事務的命令,指定參數值,返回結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和返回值參數. 
        /// 
        /// 示例:  
        ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回結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);

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

                // 調用重載方法 
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName); 
            } 
        }

        #endregion ExecuteScalar

        #region ExecuteXmlReader XML閱讀器 
        /// <summary> 
        /// 執行指定數據庫連接對象的SqlCommand命令,並產生一個XmlReader對象做為結果集返回. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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結果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText) 
        { 
            // 執行參數為空的方法 
            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的SqlCommand命令,並產生一個XmlReader對象做為結果集返回,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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參數數組</param> 
        /// <returns>返回XmlReader結果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters) 
        { 
            if (connection == null) throw new ArgumentNullException("connection");

            bool mustCloseConnection = false; 
            // 創建SqlCommand命令,並進行預處理 
            SqlCommand cmd = new SqlCommand(); 
            try 
            { 
                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);

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

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

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

        /// <summary> 
        /// 執行指定數據庫連接對象的SqlCommand命令,並產生一個XmlReader對象做為結果集返回,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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參數的對象數組</param> 
        /// <returns>返回XmlReader結果集對象.</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");

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

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

                // 調用重載方法 
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫事務的SqlCommand命令,並產生一個XmlReader對象做為結果集返回. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders"); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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結果集對象.</returns> 
        public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText) 
        { 
            // 執行參數為空的方法 
            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null); 
        }

        /// <summary> 
        /// 執行指定數據庫事務的SqlCommand命令,並產生一個XmlReader對象做為結果集返回,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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參數數組</param> 
        /// <returns>返回XmlReader結果集對象.</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");

            // 創建SqlCommand命令,並進行預處理 
            SqlCommand cmd = new SqlCommand(); 
            bool mustCloseConnection = false; 
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

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

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

        /// <summary> 
        /// 執行指定數據庫事務的SqlCommand命令,並產生一個XmlReader對象做為結果集返回,指定參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</param> 
        /// <returns>返回一個包含結果集的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");

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

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

                // 調用重載方法 
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters); 
            } 
            else 
            { 
                // 沒有參數值 
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName); 
            } 
        }

        #endregion ExecuteXmlReader 閱讀器結束

        #region FillDataset 填充數據集 
        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.)</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");

            // 創建並打開數據庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString)) 
            { 
                connection.Open();

                // 調用指定數據庫連接字符串重載方法. 
                FillDataset(connection, commandType, commandText, dataSet, tableNames); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集.指定命令參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</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參數數組</param> 
        /// <param name="dataSet">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </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"); 
            // 創建並打開數據庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString)) 
            { 
                connection.Open();

                // 調用指定數據庫連接字符串重載方法. 
                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接字符串的命令,映射數據表並填充數據集,指定存儲過程參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24); 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param>    
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</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"); 
            // 創建並打開數據庫連接對象,操作完成釋放對象. 
            using (SqlConnection connection = new SqlConnection(connectionString)) 
            { 
                connection.Open();

                // 調用指定數據庫連接字符串重載方法. 
                FillDataset(connection, spName, dataSet, tableNames, parameterValues); 
            } 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param>    
        public static void FillDataset(SqlConnection connection, CommandType commandType, 
            string commandText, DataSet dataSet, string[] tableNames) 
        { 
            FillDataset(connection, commandType, commandText, dataSet, tableNames, null); 
        }

        /// <summary> 
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</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> 
        /// 執行指定數據庫連接對象的命令,映射數據表並填充數據集,指定存儲過程參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</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");

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

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

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

        /// <summary> 
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        public static void FillDataset(SqlTransaction transaction, CommandType commandType, 
            string commandText, 
            DataSet dataSet, string[] tableNames) 
        { 
            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null); 
        }

        /// <summary> 
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集,指定參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24)); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</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> 
        /// 執行指定數據庫事務的命令,映射數據表並填充數據集,指定存儲過程參數值. 
        /// </summary> 
        /// <remarks> 
        /// 此方法不提供訪問存儲過程輸出參數和返回值參數. 
        /// 
        /// 示例:  
        ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36); 
        /// </remarks> 
        /// <param name="transaction">一個有效的連接事務</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataSet">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        /// <param name="parameterValues">分配給存儲過程輸入參數的對象數組</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");

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

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

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

        /// <summary> 
        /// [私有方法][內部調用]執行指定數據庫連接對象/事務的命令,映射數據表並填充數據集,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">一個有效的數據庫連接對象</param> 
        /// <param name="transaction">一個有效的連接事務</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">要填充結果集的DataSet實例</param> 
        /// <param name="tableNames">表映射的數據表數組 
        /// 用戶定義的表名 (可有是實際的表名.) 
        /// </param> 
        /// <param name="commandParameters">分配給命令的SqlParamter參數數組</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");

            // 創建SqlCommand命令,並進行預處理 
            SqlCommand command = new SqlCommand(); 
            bool mustCloseConnection = false; 
            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

            // 執行命令 
            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(); 
                    } 
                }

                // 填充數據集使用默認表名稱 
                dataAdapter.Fill(dataSet);

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

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

        #region UpdateDataset 更新數據集 
        /// <summary> 
        /// 執行數據集更新到數據庫,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]一個有效的T-SQL語句或存儲過程</param> 
        /// <param name="deleteCommand">[刪除記錄]一個有效的T-SQL語句或存儲過程</param> 
        /// <param name="updateCommand">[更新記錄]一個有效的T-SQL語句或存儲過程</param> 
        /// <param name="dataSet">要更新到數據庫的DataSet</param> 
        /// <param name="tableName">要更新到數據庫的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");

            // 創建SqlDataAdapter,當操作完成后釋放. 
            using (SqlDataAdapter dataAdapter = new SqlDataAdapter()) 
            { 
                // 設置數據適配器命令 
                dataAdapter.UpdateCommand = updateCommand; 
                dataAdapter.InsertCommand = insertCommand; 
                dataAdapter.DeleteCommand = deleteCommand;

                // 更新數據集改變到數據庫 
                dataAdapter.Update(dataSet, tableName);

                // 提交所有改變到數據集. 
                dataSet.AcceptChanges(); 
            } 
        } 
        #endregion

        #region CreateCommand 創建一條SqlCommand命令 
        /// <summary> 
        /// 創建SqlCommand命令,指定數據庫連接對象,存儲過程名和參數. 
        /// </summary> 
        /// <remarks> 
        /// 示例:  
        ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName"); 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</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");

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

            // 如果有參數值 
            if ((sourceColumns != null) && (sourceColumns.Length > 0)) 
            { 
                // 從緩存中加載存儲過程參數,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                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(DataRow) 
        /// <summary> 
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做為參數值,返回受影響的行數. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回影響的行數</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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做為參數值,返回受影響的行數. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回影響的行數</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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫事物的存儲過程,使用DataRow做為參數值,返回受影響的行數. 
        /// </summary> 
        /// <param name="transaction">一個有效的連接事務 object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回影響的行數</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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值 
                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(DataRow) 
        /// <summary> 
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做為參數值,返回DataSet. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回一個包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做為參數值,返回DataSet. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回一個包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做為參數值,返回DataSet. 
        /// </summary> 
        /// <param name="transaction">一個有效的連接事務 object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回一個包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值 
                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(DataRow) 
        /// <summary> 
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做為參數值,返回DataReader. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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


        /// <summary> 
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做為參數值,返回DataReader. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫事物的存儲過程,使用DataRow做為參數值,返回DataReader. 
        /// </summary> 
        /// <param name="transaction">一個有效的連接事務 object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回包含結果集的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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值 
                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(DataRow) 
        /// <summary> 
        /// 執行指定連接數據庫連接字符串的存儲過程,使用DataRow做為參數值,返回結果集中的第一行第一列. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回結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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做為參數值,返回結果集中的第一行第一列. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回結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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做為參數值,返回結果集中的第一行第一列. 
        /// </summary> 
        /// <param name="transaction">一個有效的連接事務 object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回結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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值 
                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(DataRow) 
        /// <summary> 
        /// 執行指定連接數據庫連接對象的存儲過程,使用DataRow做為參數值,返回XmlReader類型的結果集. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回XmlReader結果集對象.</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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

        /// <summary> 
        /// 執行指定連接數據庫事務的存儲過程,使用DataRow做為參數值,返回XmlReader類型的結果集. 
        /// </summary> 
        /// <param name="transaction">一個有效的連接事務 object</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="dataRow">使用DataRow作為參數值</param> 
        /// <returns>返回XmlReader結果集對象.</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,如果緩存中不存在則從數據庫中檢索參數信息並加載到緩存中. () 
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

                // 分配參數值 
                AssignParameterValues(commandParameters, dataRow);

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

    }

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

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

        /// <summary> 
        /// 探索運行時的存儲過程,返回SqlParameter參數數組. 
        /// 初始化參數值為 DBNull.Value. 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接</param> 
        /// <param name="spName">存儲過程名稱</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param> 
        /// <returns>返回SqlParameter參數數組</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信息,並填充到cmd的Parameters參數集中. 
            SqlCommandBuilder.DeriveParameters(cmd); 
            connection.Close(); 
            // 如果不包含返回值參數,將參數集中的每一個參數刪除. 
            if (!includeReturnValueParameter) 
            { 
                cmd.Parameters.RemoveAt(0); 
            }

            // 創建參數數組 
            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count]; 
            // 將cmd的Parameters參數集復制到discoveredParameters數組. 
            cmd.Parameters.CopyTo(discoveredParameters, 0);

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

        /// <summary> 
        /// SqlParameter參數數組的深層拷貝. 
        /// </summary> 
        /// <param name="originalParameters">原始參數數組</param> 
        /// <returns>返回一個同樣的參數數組</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,構造函數結束

        #region 緩存方法

        /// <summary> 
        /// 追加參數數組到緩存. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符串</param> 
        /// <param name="commandText">存儲過程名或SQL語句</param> 
        /// <param name="commandParameters">要緩存的參數數組</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> 
        /// 從緩存中獲取參數數組. 
        /// </summary> 
        /// <param name="connectionString">一個有效的數據庫連接字符</param> 
        /// <param name="commandText">存儲過程名或SQL語句</param> 
        /// <returns>參數數組</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 緩存方法結束

        #region 檢索指定的存儲過程的參數集

        /// <summary> 
        /// 返回指定的存儲過程的參數集 
        /// </summary> 
        /// <remarks> 
        /// 這個方法將查詢數據庫,並將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <returns>返回SqlParameter參數數組</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集 
        /// </summary> 
        /// <remarks> 
        /// 這個方法將查詢數據庫,並將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connectionString">一個有效的數據庫連接字符.</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param> 
        /// <returns>返回SqlParameter參數數組</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> 
        /// [內部]返回指定的存儲過程的參數集(使用連接對象). 
        /// </summary> 
        /// <remarks> 
        /// 這個方法將查詢數據庫,並將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接字符</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <returns>返回SqlParameter參數數組</returns> 
        internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName) 
        { 
            return GetSpParameterSet(connection, spName, false); 
        }

        /// <summary> 
        /// [內部]返回指定的存儲過程的參數集(使用連接對象) 
        /// </summary> 
        /// <remarks> 
        /// 這個方法將查詢數據庫,並將信息存儲到緩存. 
        /// </remarks> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter"> 
        /// 是否包含返回值參數 
        /// </param> 
        /// <returns>返回SqlParameter參數數組</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集(使用連接對象) 
        /// </summary> 
        /// <param name="connection">一個有效的數據庫連接對象</param> 
        /// <param name="spName">存儲過程名</param> 
        /// <param name="includeReturnValueParameter">是否包含返回值參數</param> 
        /// <returns>返回SqlParameter參數數組</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 參數集檢索結束

    } 
}

如果要獲取連接數據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;才能調用。