【SQLSERVER】 存储过程
2016-07-25 18:07
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ALTER PROC SP_SinoAirNumberGet @ShipmentNumber NVARCHAR(50) AS BEGIN DECLARE @ColoaderShipmentNumber NVARCHAR(50),@ShipmentCode NVARCHAR(50),@errorMessage NVARCHAR(200) SET @ColoaderShipmentNumber = '' --check agent shipment SELECT @ShipmentCode = ShipmentCode FROM Shipment s with (nolock) INNER JOIN Customer c ON s.CustomerCode = c.CustomerCode AND FranchiseCodeRelate IS NULL WHERE ShipmentNumber = @ShipmentNumber --check gateway shipment IF @ShipmentCode IS NULL OR @ShipmentCode = '' BEGIN SELECT @ShipmentCode = ShipmentCode FROM Shipment s with (nolock) INNER JOIN Customer c ON s.CustomerCode = c.CustomerCode AND FranchiseCodeRelate IS NOT NULL WHERE ShipmentNumber = @ShipmentNumber END IF @ShipmentCode IS NULL OR @ShipmentCode = '' BEGIN RAISERROR('错误的提单号码!',16,1) RETURN END SELECT @ColoaderShipmentNumber = SinoAirNumber FROM SinoAirNumber with (nolock) WHERE ShipmentCode = @ShipmentCode IF @ColoaderShipmentNumber IS NOT NULL AND @ColoaderShipmentNumber != '' BEGIN SELECT @ColoaderShipmentNumber AS SinoAirNumber RETURN END SET @ColoaderShipmentNumber = '' IF @ColoaderShipmentNumber IS NULL OR @ColoaderShipmentNumber = '' BEGIN SELECT Top 1 @ColoaderShipmentNumber = SinoAirNumber FROM SinoAirNumber with (nolock) WHERE SinoAirNumberStatus != 'Y' OR SinoAirNumberStatus IS NULL ORDER BY SinoAirNumber ASC END IF (EXISTS (SELECT 1 FROM SinoAirNumber WHERE SinoAirNumber = @ColoaderShipmentNumber AND (SinoAirNumberStatus != 'Y' OR SinoAirNumberStatus IS NULL))) OR (EXISTS (SELECT 1 FROM SinoAirNumber WHERE SinoAirNumber = @ShipmentNumber AND SinoAirNumberStatus = 'Y' )) BEGIN BEGIN TRANSACTION BEGIN TRY UPDATE SinoAirNumber SET SinoAirNumberStatus = 'Y',ShipmentCode = @ShipmentCode WHERE SinoAirNumber = @ColoaderShipmentNumber UPDATE Shipment SET ShipmentNumber = @ColoaderShipmentNumber,ColoaderNumber=@ShipmentNumber WHERE ShipmentCode = @ShipmentCode INSERT INTO ShipmentExtraInfo (ShipmentCode,ShipmentNumber) VALUES (@ShipmentCode,@ColoaderShipmentNumber) COMMIT END TRY BEGIN CATCH ROLLBACK SET @errorMessage = ERROR_MESSAGE() RAISERROR(@errorMessage,16,1) END CATCH END ELSE BEGIN SELECT Top 1 @ColoaderShipmentNumber = SinoAirNumber FROM SinoAirNumber with (nolock) WHERE SinoAirNumberStatus != 'Y' OR SinoAirNumberStatus IS NULL ORDER BY SinoAirNumber ASC END IF @ColoaderShipmentNumber IS NULL OR @ColoaderShipmentNumber = '' BEGIN RAISERROR('Number pool has empty',16,1) RETURN END SELECT @ColoaderShipmentNumber AS SinoAirNumber END
(1).创建存储过程的语句:
CREATE PROC SP_TestName
@Parameter Type(length)
AS
BEGIN
...
END
(2).x修改存储过程:
ALTER....
(3).DECLARE关键字,声明参数(全局变量)
(4).SET语句,为参数赋值,或初始化参数
(5).SELECT @ShipmentCode = ShipmentCode FROM Shipment s with (nolock)
INNER JOIN Customer c ON s.CustomerCode = c.CustomerCode AND FranchiseCodeRelate IS NULL
WHERE ShipmentNumber = @ShipmentNumber
INNER JOIN : 内连接
with(NOLOCK):指定允许脏读。在sqlserver中,当一个事物访问某张表时,该表出于lock状态,另一事物必须等待该事物结束之后,才能访问当前表。脏读的意思是:
允许当前一事物在另一事物访问某表时,读取当前表的数据,注意只允许读取,不允许其他数据库操作。这样会造成一定数据上的错误。适用于报表。
(6).EXISTS:判断当前查询是否存在一列或多于一列,返回true或false。当当前查询无列即无数据返回时,EXISTS返回false,当数据返回时,EXISTS返回true。
(7).事物(TRANSACTION):当存在两条或两条以上的增删改(注意查询不算)语句时,应开启事务,若发生错误,rellback,并使用try catch将错误信息返回。
格式:
BEGIN TRANSACTION
BEGIN TRY
....
COMMIT
END TRY
BEGIN CATCH
ROLLBACK
SET @errorMessage = ERROR_MESSAGE()
RAISERROR(@errorMessage,16,1) errorMessage:需要在前面变量中声明。
END CATCH
(8).RAISERROR:错误处理
RAISERROR(“errorMessage”,16,1) 16:代表错误级别 1:不知道0.0
(9).RETURN: 结束存储过程。
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