oledbhelper.cs

.net数据库操作类源码.分别有ms sql server , oracle , ole db , Npg的数据

		/// <summary>
		/// Execute a stored procedure via an OleDbCommand (that returns no resultset) against the specified OleDbConnection 
		/// 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 OleDbConnection</param>
		/// <param name="spName">the name of the stored prcedure</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(OleDbConnection connection, string spName, params object[] parameterValues)
		{
			//if we got 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)
				OleDbParameter[] commandParameters = OleDbHelperParameterCache.GetSpParameterSet(connection.ConnectionString, spName);

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

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

		/// <summary>
		/// Execute an OleDbCommand (that returns no resultset and takes no parameters) against the provided OleDbTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
		/// </remarks>
		/// <param name="transaction">a valid OleDbTransaction</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param>  
		/// <returns>an int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(OleDbTransaction transaction, CommandType commandType, string commandText)
		{
			//pass through the call providing null for the set of OleDbParameters
			return ExecuteNonQuery(transaction, commandType, commandText, (OleDbParameter[])null);
		}

		/// <summary>
		/// Execute an OleDbCommand (that returns no resultset) against the specified OleDbTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">a valid OleDbTransaction</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param>  
		/// <param name="commandParameters">an array of OleDbParamters used to execute the command</param>
		/// <returns>an int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(OleDbTransaction transaction, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
		{
			//create a command and prepare it for execution
			OleDbCommand cmd = new OleDbCommand();
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
			
			//finally, execute the command.
			return cmd.ExecuteNonQuery();
		}

		/// <summary>
		/// Execute a stored procedure via an OleDbCommand (that returns no resultset) against the specified 
		/// OleDbTransaction 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 OleDbTransaction</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(OleDbTransaction transaction, string spName, params object[] parameterValues)
		{
			//if we got 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 & populet the cache)
				OleDbParameter[] commandParameters = OleDbHelperParameterCache.GetSpParameterSet(transaction.Connection.ConnectionString, spName);

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

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

		#endregion ExecuteNonQuery

		#region ExecuteDataSet

		/// <summary>
		/// Execute an OleDbCommand (that returns a resultset and takes no parameters) against the database specified in 
		/// the connection string. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connectionString">a valid connection string for an OleDbConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param>  
		/// <returns>a dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
		{
			//pass through the call providing null for the set of OleDbParameters
			return ExecuteDataset(connectionString, commandType, commandText, (OleDbParameter[])null);
		}

		/// <summary>
		/// Execute an OleDbCommand (that returns a resultset) against the database specified in the connection string 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">a valid connection string for an OleDbConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param> 
		/// <param name="commandParameters">an array of OleDbParamters used to execute the command</param>
		/// <returns>a dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
		{
			//create & open an OleDbConnection, and dispose of it after we are done.
			using (OleDbConnection cn = new OleDbConnection(connectionString))
			{
				cn.Open();

				//call the overload that takes a connection in place of the connection string
				return ExecuteDataset(cn, commandType, commandText, commandParameters);
			}
		}

		/// <summary>
		/// Execute a stored procedure via an OleDbCommand (that returns a resultset) against the database specified in 
		/// the conneciton string 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.:  
		///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connectionString">a valid connection string for an OleDbConnection</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>a dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
		{
			//if we got 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 & populet the cache)
				OleDbParameter[] commandParameters = OleDbHelperParameterCache.GetSpParameterSet(connectionString, spName);

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

				//call the overload that takes an array of OleDbParameters
				return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
				//otherwise we can just call the SP without params
			else 
			{
				return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute an OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connection">a valid OleDbConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param>
		/// <returns>a dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText)
		{
			//pass through the call providing null for the set of OleDbParameters
			return ExecuteDataset(connection, commandType, commandText, (OleDbParameter[])null);
		}
		
		/// <summary>
		/// Execute an OleDbCommand (that returns a resultset) against the specified OleDbConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">a valid OleDbConnection</param>
		/// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">the stored procedure name or PL/SQL command</param> 
		/// <param name="commandParameters">an array of OleDbParamters used to execute the command</param>
		/// <returns>a dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(OleDbConnection connection, CommandType commandType, string commandText, params OleDbParameter[] commandParameters)
		{
			//create a command and prepare it for execution
			OleDbCommand cmd = new OleDbCommand();
			PrepareCommand(cmd, connection, (OleDbTransaction)null, commandType, commandText, commandParameters);
			
			//create the DataAdapter & DataSet
			OleDbDataAdapter da = new OleDbDataAdapter(cmd);
			DataSet ds = new DataSet();

			//fill the DataSet using default values for DataTable names, etc.
			da.Fill(ds);
			
			//return the dataset
			return ds;						
		}
		
		/// <summary>
		/// Execute a stored procedure via an OleDbCommand (that returns a resultset) against the specified OleDbConnection 
		/// 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.:  
		///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">a valid OleDbConnection</param>
		/// <param name="spName">the name of the stored prcedure</param>
		/// <param name="parameterValues">an array of objects to be assigned as the input values of the stored procedure</param>