Question

以下是存储过程，其中iam传递DriverID = 0并且DrivarCode = DD1和DriverName = Ram。执行控制将失败。控制即将到来 IF（（@DriverName！= NULL）和（（@DriverCode！= NULL）），之后失败.DriverName和DriverCode包含值。但仍然会失败。这可能是什么原因

Create Procedure InsertUpdateM
(
    @DriverID int,
    @DriverCode varchar(50),
    @DriverName varchar(50),
    @Msg varchar(50) output
)

AS
BEGIN
IF @DriverID=0
    BEGIN
        SELECT DriverName,DriverCode FROM DriverM WHERE DriverName=@DriverName and DriverCode=@DriverCode
        IF(@@RowCount>0) GOTO Fails
            IF ((@DriverName!=NULL) and ((@DriverCode!=NULL))
                BEGIN
                    INSERT INTO DriverM(DriverCode,DriverName) values(@DriverCode,@DriverName)
                END
    END
ELSE
    BEGIN
        SELECT DriverName,DriverCode FROM DriverM WHERE DriverName=@DriverName and DriverCode=@DriverCode
        IF(@@RowCount>0) GOTO Fails
            IF ((@DriverName!=NULL) and ((@DriverCode!=NULL)
                BEGIN
                    UPDATE DriverM SET DriverCode=@DriverCode,DriverName=@DriverName WHERE DriverID=@DriverID
                END
    END
END

Fails
    SET @Msg='Failed'

Answer 1

我甚至不确定这段代码是如何解析的。在存储过程结束后，您有“失败”，并且它不以冒号结束。你想要更像这样的东西：

ELSE
    BEGIN -- Begin 1
        SELECT DriverName,DriverCode FROM DriverM WHERE DriverName=@DriverName and DriverCode=@DriverCode
        IF(@@RowCount>0) GOTO Fails
            IF ((@DriverName!=NULL) and ((@DriverCode!=NULL)
                BEGIN -- Begin 2
                    UPDATE DriverM SET DriverCode=@DriverCode,DriverName=@DriverName WHERE DriverID=@DriverID
                END  -- End of 2
    END -- End of 1

GOTO Succeeds
Fails:
    SET @Msg='Failed'
Succeeds:
END -- End of SP

Answer 2

您可以使用以下代码来实现它。

Driverid:
    IF EXISTS(your query to check)
    BEGIN
        GOTO Driverid
    END

在SQL Server 2005中使用IF THEN和GOTO

2 个答案: