將PostgreSQL觸發器移植到SQL Server 2008中

Question

我必須移植一個PostgreSQL觸發器，但由於我沒有太多經驗，所以我不知道如何更改某些部分。原觸發是：

CREATE TRIGGER aerolinea_tr 
AFTER UPDATE 
ON public.aerolinea FOR EACH ROW 
EXECUTE PROCEDURE public."actualizaWarehoseTemplate"(); 

DECLARE 
    mviews RECORD; 
BEGIN 
    IF (TG_OP = 'UPDATE') THEN 
    FOR mviews IN SELECT DISTINCT template.idtemplate 
        FROM template 
        INNER JOIN vueloaerolinea ON (template.idvueloaerolinea = vueloaerolinea.idvueloaerolinea) 
        WHERE vueloaerolinea.codigolinea = old.codigolinea 
    LOOP 
     UPDATE detalletemplate SET idwarehose = new.idwarehouse WHERE detalletemplate.idtemplate = mviews.idtemplate; 
    END LOOP; 
    END IF; 
    RETURN old; 
END; 

而我所做的是：

CREATE TRIGGER aerolinea_tr 
ON aerolinea 
AFTER UPDATE 
AS 
BEGIN 
    -- if no row affected, the trigger ends. 
    IF @@ROWCOUNT = 0 
    BEGIN 
    RETURN; 
    END; 

    IF EXISTS(SELECT * FROM inserted) 
    BEGIN 
    IF EXISTS(SELECT * FROM deleted) 
    BEGIN 
     --Update code goes here. 
    END 
    END 
END; 

但我找不到一個相當於記錄SQL Server的，我不知道該怎麼做的那部分。

Answer 1

看起來您需要使用cursor。你可以嘗試這樣的事情 - 它不是完整的，因爲我不知道aerolinea表的表模式，但儘管如此，應該讓你在正確的方向前進：

DECLARE @idtemplate INT //Assuming this is an int 
DECLARE @mviews CURSOR 
DECLARE @newidwarehouse INT 

SELECT @newidwarehouse = idwarehouse FROM INSERTED 

SET @mviews = CURSOR FOR 
SELECT DISTINCT template.idtemplate 
FROM template 
    INNER JOIN vueloaerolinea ON (template.idvueloaerolinea = vueloaerolinea.idvueloaerolinea) 
    INNER JOIN DELETED ON DELETED.codigolinea = vueloaerolinea.codigolinea 

OPEN @mviews 
FETCH NEXT 
FROM @mviews INTO @idtemplate 
WHILE @@FETCH_STATUS = 0 
BEGIN 
    UPDATE detalletemplate 
    SET idwarehose = @newidwarehouse 
    WHERE detalletemplate.idtemplate = @idtemplate 
FETCH NEXT 
FROM @mviews INTO @idtemplate 
END 
CLOSE @mviews 
DEALLOCATE @mviews 

順便說一句，你不檢查更新時需要檢查插入和刪除。你可以檢查刪除：

IF EXISTS (SELECT * FROM DELETED)