我正在做一堆CRUD操作并创建CUD合并storedprocs。我的存储过程是这样的为什么WHEN MATCHED'不能在MERGE语句的'UPDATE'子句中出现多次?
CREATE PROCEDURE usp_AdministrationHistoryMerge
@AdministrationHistoryID int out,
@AdministratorID int,
@DateCreated datetime,
@CreatedBy nvarchar(50),
@ModifiedBy nvarchar(50),
@Action int
AS
SET NOCOUNT OFF
SET TRANSACTION ISOLATION LEVEL READ COMMITTED
DECLARE @ERROR_SEVERITY int,
@MESSAGE varchar(1000),
@ERROR_NUMBER int,
@ERROR_PROCEDURE nvarchar(200),
@ERROR_LINE int,
@ERROR_MESSAGE nvarchar(4000),
@IsActive bit,
@DateModified datetime;
begin try
if @Action = 1
begin
set @IsActive = 1
set @AdministrationHistoryID = SCOPE_IDENTITY()
end
merge [AdministrationHistory] as target
using (select @AdministratorID, @DateCreated, @CreatedBy, @DateModified, @ModifiedBy, @IsActive)
as source (AdministratorID, DateCreated, CreatedBy, DateModified, ModifiedBy, IsActive)
on (target.AdministrationHistoryID = source.AdministrationHistoryID)
when matched and @Action = -1 then
update
set IsActive = 0
when matched and @Action = 0 then
update
set ModifiedBy = @ModifiedBy,
DateModified = GETDATE()
when matched and @Action = 1 then
insert
(AdministratorID, DateCreated, CreatedBy, IsActive)
values
(@AdministratorID, @DateCreated, @CreatedBy, @IsActive);
end try
BEGIN CATCH
SET @ERROR_SEVERITY = ISNULL(ERROR_SEVERITY(),'');
SET @ERROR_NUMBER = ISNULL(ERROR_NUMBER(),'');
SET @ERROR_PROCEDURE = ISNULL(ERROR_PROCEDURE(),'');
SET @ERROR_LINE = ISNULL(ERROR_LINE(),'');
SET @ERROR_MESSAGE = ISNULL(ERROR_MESSAGE(),'');
-- Test if the transaction is uncommittable.
IF (XACT_STATE()) = -1
BEGIN
--PRINT N'The transaction is in an uncommittable state. Rolling back transaction.'
ROLLBACK TRANSACTION;
END;
-- Test if the transaction is active and valid.
IF (XACT_STATE()) = 1
BEGIN
--PRINT N'The transaction is committable. Committing transaction.'
COMMIT TRANSACTION;
END;
SET @MESSAGE = 'Error Occured in Stored Procedure ' + cast(@ERROR_PROCEDURE as varchar(200)) +
'; Line Number ' + cast(@ERROR_LINE as varchar) +
'; Message: [' + cast(@ERROR_NUMBER as varchar) + '] - '
+ cast(@ERROR_MESSAGE as varchar(255))
RAISERROR(@MESSAGE, @ERROR_SEVERITY, 1);
END CATCH;
当我去执行这个我得到这个完整的错误
消息10714,级别15,状态1,过程usp_AdministrationHistoryMerge,36号线 类型的动作'WHEN MATCHED'不能在MERGE语句的'UPDATE'子句中出现多次。
我环顾四周,发现了一些方法来解决这个问题,但是我发现这个错误并不适合解决这个问题,而不是删除,我需要将记录的IsActive更新为0.
此外,在我的搜索没有人真正解释为什么这个错误被抛出,是的,我知道它很明显,因为错误是在那里,但为什么这是不允许发生?基于这种情况,有没有关于如何做到这一点的想法?或者当@Action为0时,我应该有这个合并调用另一个storedproc?
您是否确信要使用MERGE? https://www.mssqltips.com/sqlservertip/3074/use-caution-with-sql-servers-merge-statement/ –
它在[MERGE文档](https://msdn.microsoft.com /en-us/library/bb510625.aspx):* MERGE语句最多可以有两个WHEN MATCHED子句。 * **和** *如果有两个WHEN MATCHED子句,则必须指定一个UPDATE动作,并且必须指定一个DELETE动作。* –
@AaronBertrand,使用MERGE不是我的选择,我使用CASE或IF语句的数字会是更好的选择......好的文章的方式 – Chris