sqlhelper.cs

C#数据库类。

		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{	
			if( connection == null ) throw new ArgumentNullException( "connection" );

			// Create a command and prepare it for execution
			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();
    		
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			if( mustCloseConnection )
				connection.Close();
			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An int representing the number of rows affected by the command</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" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An int representing the number of rows affected by the command</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" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Finally, execute the command
			int retval = cmd.ExecuteNonQuery();
    			
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An int representing the number of rows affected by the command</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" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
			}
		}



        #endregion ExecuteNonQuery

		#region ExecuteNonQueryReturnValue
		/// <summary>
		/// 执行一个 Sql 命令，返回指定 Output 参数的值
		/// </summary>
		/// <param name="connectionString">a valid connection string for a SqlConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or T-SQL command</param>
		/// <param name="outParamName">返回参数的名称</param>
		/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
		/// <returns>返回参数值</returns>
		public static object ExecuteNonQueryReturnValue(string connectionString, CommandType commandType, string commandText,string outParamName, params SqlParameter[] commandParameters) 
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();
				return ExecuteNonQueryReturnValue(connection,commandType,commandText,outParamName,commandParameters);
			}		
		}

		/// <summary>
		/// 执行一个 Sql 命令，返回指定 Output 参数的值
		/// </summary>
		/// <param name="connection">SqlConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or T-SQL command</param>
		/// <param name="outParamName">返回参数的名称</param>
		/// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
		/// <returns>返回参数值</returns>
		public static object ExecuteNonQueryReturnValue(SqlConnection connection, CommandType commandType, string commandText,string outParamName, params SqlParameter[] commandParameters)
		{
			using (SqlCommand cmd = new SqlCommand())
			{
				bool mustCloseConnection = false;
				PrepareCommand(cmd, connection, null, commandType, commandText, commandParameters, out mustCloseConnection );

				if(!cmd.Parameters.Contains(outParamName))
				{
					throw new ArgumentException ("SqlCommand 不包含此参数 " + outParamName);
				}
				
				//增加输入输出参数的支持
				//updated by liangguangming

				if(cmd.Parameters[outParamName].Direction != ParameterDirection.Output && cmd.Parameters[outParamName].Direction != ParameterDirection.InputOutput)
				{
					throw new ArgumentException ("参数 " + outParamName + " 不是输出参数");
				}

				int val = cmd.ExecuteNonQuery();

				object returnValue = cmd.Parameters [outParamName].Value;

				cmd.Parameters.Clear();
				if( mustCloseConnection )
				{
					connection.Close();
				}
				return returnValue;
			}
		}
		/// <summary>
		/// 执行一个 存储过程 命令，返回指定 Output 参数的值
		/// </summary>
		/// <param name="connectionString">a valid connection string for a SqlConnection</param>
		/// <param name="spName">the stored procedure name</param>
		/// <param name="outParamName">返回参数的名称</param>
		/// <param name="parameterValues">an array of SqlParamters used to execute the command</param>
		/// <returns>返回参数值</returns>
		public static object ExecuteNonQueryReturnValue(string connectionString, string spName, string outParamName, 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 ExecuteNonQueryReturnValue(connectionString, CommandType.StoredProcedure, spName, outParamName, commandParameters);
			}
			else 
			{
				return ExecuteNonQueryReturnValue(connectionString, CommandType.StoredProcedure, spName, outParamName, (SqlParameter[])null);
			}
		}
		/// <summary>
		/// 执行一个 存储过程 命令，返回指定 Output 参数的值
		/// </summary>
		/// <param name="connection">SqlConnection</param>
		/// <param name="spName">the stored procedure name or T-SQL command</param>
		/// <param name="outParamName">返回参数的名称</param>
		/// <param name="parameterValues">an array of SqlParamters used to execute the command</param>
		/// <returns>返回参数值</returns>
		public static object ExecuteNonQueryReturnValue(SqlConnection connection, string spName, string outParamName, params object[] parameterValues)
		{
			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 ExecuteNonQueryReturnValue(connection, CommandType.StoredProcedure, spName, outParamName, commandParameters);
			}
			else