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

namespace hkszyy
{
?/// <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 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并生成參數.
??/// </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)并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,并進行預處理
???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并加載到緩存中. ()
????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" );

???// 創建并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" );
???// 創建并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并加載到緩存中. ()
????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,并進行預處理
???SqlCommand cmd = new SqlCommand();

???bool mustCloseConnection = false;
???PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
???????????????
???// 執行SqlCommand命令,并返回結果.
???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" );

????// 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,并進行預處理
???SqlCommand cmd = new SqlCommand();
???bool mustCloseConnection = false;
???PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
???????????????
???// 執行SqlCommand命令,并返回結果.
???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,并產生一個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,并產生一個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,并進行預處理
???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,并產生一個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" );

????// 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,并產生一個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,并產生一個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,并進行預處理
???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,并產生一個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" );

????// 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,映射數據表并填充數據集.
??/// </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" );
???????????
???// 創建并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,映射數據表并填充數據集.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" );
???// 創建并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,映射數據表并填充數據集,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" );
???// 創建并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,映射數據表并填充數據集.
??/// </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,映射數據表并填充數據集,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,映射數據表并填充數據集,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" );

????// 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,映射數據表并填充數據集.
??/// </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,映射數據表并填充數據集,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,映射數據表并填充數據集,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" );

????// 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,映射數據表并填充數據集,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,并進行預處理
???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并加載到緩存中. ()
????SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

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

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

???return cmd;
??}
??#endregion

??#region ExecuteNonQueryTypedParams 類型化參數(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并加載到緩存中. ()
????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" );

??/// <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并加載到緩存中. ()
????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" );

??/// <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" );

??/// <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" );

??#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并加載到緩存中. ()
????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并加載到緩存中. ()
????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" );

??#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并加載到緩存中. ()
????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" );

??/// <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" );

??#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" );

??/// <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" );

?/// <summary>
?/// SqlHelperParameterCache提供緩存存儲過程參數,并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,并填充到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,并將信息存儲到緩存.
??/// </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,并將信息存儲到緩存.
??/// </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,并將信息存儲到緩存.
??/// </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,并將信息存儲到緩存.
??/// </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

?}
}

SqlHelper(帶詳細中文注釋)

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