我正在做一堆CRUD操作並創建CUD合併storedprocs。我的存儲過程是這樣的爲什麼WHEN MATCHED'不能在MERGE語句的'UPDATE'子句中出現多次?
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;
當我去執行這個我得到這個完整的錯誤
消息10714,級別15,狀態1,過程usp_AdministrationHistoryMerge,36號線 類型的動作'WHEN MATCHED'不能在MERGE語句的'UPDATE'子句中出現多次。
我環顧四周,發現了一些方法來解決這個問題,但是我發現這個錯誤並不適合解決這個問題,而不是刪除,我需要將記錄的IsActive更新爲0.
此外,在我的搜索沒有人真正解釋爲什麼這個錯誤被拋出,是的,我知道它很明顯,因爲錯誤是在那裏,但爲什麼這是不允許發生?基於這種情況,有沒有關於如何做到這一點的想法?或者當@Action爲0時,我應該有這個合併調用另一個storedproc?
您是否確信要使用MERGE? https://www.mssqltips.com/sqlservertip/3074/use-caution-with-sql-servers-merge-statement/ –
它在[MERGE文檔](https://msdn.microsoft.com /en-us/library/bb510625.aspx):* MERGE語句最多可以有兩個WHEN MATCHED子句。 * **和** *如果有兩個WHEN MATCHED子句,則必須指定一個UPDATE動作,並且必須指定一個DELETE動作。* –
@AaronBertrand,使用MERGE不是我的選擇,我使用CASE或IF語句的數字會是更好的選擇......好的文章的方式 – Chris