Question

如果由于外键约束违规而无法成功执行删除语句，是否有办法在SQL Server中中止存储过程？默认情况下，该过程似乎忽略该错误并继续下一个语句。

但是，对于其他类型的错误（例如，从不存在的表中删除），过程将中止。

示例程序：

SET ANSI_NULLS ON
SET QUOTED_IDENTIFIER ON
GO
CREATE PROCEDURE  [dbo].[TestSP]
AS
BEGIN
    SET NOCOUNT ON;

    print 'BEFORE';

    DELETE FROM ExistingWithConstraints;
    print 'AFTER DELETE ExistingWithConstraints';

    DELETE FROM NonExisting;
    print 'AFTER DELETE NonExisting';
END

生成输出（请注意，上面的最后一条消息不打印）：

BEFORE
<snip constraint violation error message>
AFTER DELETE ExistingWithConstraints    
<snip invalid object name error message>

Answer 1

使用交易和正确的错误处理

CREATE PROCEDURE  [dbo].[TestSP]
AS
SET XACT_ABORT, NOCOUNT ON
DECLARE @starttrancount int

BEGIN TRY
    SELECT @starttrancount = @@TRANCOUNT

    IF @starttrancount = 0
        BEGIN TRANSACTION

    DELETE FROM ExistingWithConstraints;
    DELETE FROM NonExisting;

    IF @starttrancount = 0 
        COMMIT TRANSACTION
END TRY
BEGIN CATCH
    IF XACT_STATE() <> 0 AND @starttrancount = 0 
        ROLLBACK TRANSACTION
    RAISERROR [rethrow caught error using @ErrorNumber, @ErrorMessage, etc]
END CATCH
GO

这是基于我的回答：Nested stored procedures containing TRY CATCH ROLLBACK pattern?

Answer 2

执行继续允许您检查@@ ERROR标准变量是否存在问题。一种更现代的方法，虽然它使用2005年添加到SQL的TRY..CATCH块：

http://msdn.microsoft.com/en-us/library/ms179296.aspx

中止外键约束违规的存储过程

2 个答案: