如何在触发器内调用函数？

Question

@temp变量有什么问题？

display: block

Answer 1

使用select调用标量函数

正确的方法是

select @temp = dbo.getNumOfReviews2(BillingEmail) 
from dbo.Orders 
where OrderID=@OrderID

注意：不建议在触发器内写入大逻辑。触发器应该简单快速，否则DML操作会很慢。此外，您使用了CURSOR，应该不惜一切代价避免使用;WITH cte AS (SELECT c1.orderid FROM dbo.[contains] c1 INNER JOIN inserted i1 ON i1.orderid = c1.orderid GROUP BY orderid HAVING Count(*) > 5 OR Sum(quantity) > 5 OR @temp > 5) UPDATE C SET [savings%] = [savings%] + 0.05 FROM [contains] C INNER JOIN inserted I ON I.orderid = C.orderid AND I.productid = C.productid AND I.size = C.size AND EXISTS (SELECT 1 FROM cte c1 WHERE c1.orderid = c.orderid) 。使用基于SET的方法重写代码。

以下是基于SET的方法代码

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Answer 2

CREATE OR REPLACE COVID19VMS_VACCINESHOT_T1

BEFORE INSERT OR UPDATE ON VACCINENEXTSHOTDATE 

FOR EACH ROW 

BEGIN 

IF :NEW.VACCINESHOTDATE := 1

:NEW.VACCINEXTSHOTDATE := to_date(VACCINESHOTDATE +28)

END IF; 

IF :NEW.VACCINESHOTDATE :=2

:NEW.VACCINENEXTSHOTDATE IS NULL

END IF

END