Question

请你帮我完成我的触发器。到目前为止我得到了什么：

CREATE TRIGGER [dbo].[atbl_Sales_OrdersLines_ITrigGG]
ON [dbo].[atbl_Sales_OrdersLines]
FOR INSERT
AS 
BEGIN

DECLARE @ID INT = (SELECT ProductID
FROM INSERTED)

DECLARE @OrderedQ INT = (SELECT SUM(Amount)
FROM atbl_Sales_OrdersLines
WHERE ProductID = @ID)

DECLARE @CurrentQ INT = (SELECT Quantity 
FROM atbl_Sales_Products
WHERE ProductID = @ID)

DECLARE @PossibleQ INT = (SELECT Amount
FROM INSERTED
WHERE ProductID = @ID)

IF (@CurrentQ - @OrderedQ >= @PossibleQ)

ELSE

END

我需要完成代码。无法弄清楚该怎么做。如果满足条件，我需要 - 触发器允许插入。如果是，则触发器将停止插入/或回滚，并提示数量不足的消息。

此外，如果insert是具有不同产品ID的多行，此代码是否有效？

感谢。

Answer 1

这样的事可能有用。此触发器检查插入中的产品，汇总已订购的总数（现在和过去），如果其中任何一个超过可用数量，则回滚整个事务。每当编写触发器时，您都希望避免任何假设，即插入/更新/删除单行，并避免使用游标。您只想使用基于基本集的操作。

    CREATE TRIGGER [dbo].[atbl_Sales_OrdersLines_ITrigGG]
    ON [dbo].[atbl_Sales_OrdersLines]
    FOR INSERT
    AS 
    BEGIN
        IF (exists (select 1 from (
            select x.ProductId, totalOrdersQty, ISNULL(asp.Quantity, 0) PossibleQty from (
                select i.ProductId, sum(aso.Amount) totalOrdersQty 
                from (select distinct ProductId from inserted) i
                join atbl_Sales_OrdersLines aso on aso.ProductId = i.ProductId
                group by productId) x
            left join atbl_Sales_Product asp on asp.ProductId = x.ProductId
            ) x
            where PossibleQty < totalOrdersQty))
        BEGIN    
            RAISERROR ('Quantity is not sufficient' ,10,1)
            ROLLBACK TRANSACTION
        END
    END

我仍然认为这是一个可怕的想法。

Answer 2

试试这个，

CREATE TRIGGER [dbo].[atbl_Sales_OrdersLines_ITrigGG]
ON [dbo].[atbl_Sales_OrdersLines]
INSTEAD OF INSERT --FOR INSERT
AS 
BEGIN

DECLARE @ID INT = (SELECT ProductID
FROM INSERTED)

DECLARE @OrderedQ INT = (SELECT SUM(Amount)
FROM atbl_Sales_OrdersLines
WHERE ProductID = @ID)

DECLARE @CurrentQ INT = (SELECT Quantity 
FROM atbl_Sales_Products
WHERE ProductID = @ID)

DECLARE @PossibleQ INT = (SELECT Amount
FROM INSERTED
WHERE ProductID = @ID)

IF (@CurrentQ - @OrderedQ >= @PossibleQ)
BEGIN
        INSERT INTO YOURTABLE (COLUMN1, COLUMN2, COLUMN3, ..)
         SELECT COLUMN1, COLUMN2, COLUMN3, ..  
         FROM inserted
END
ELSE
BEGIN
    RAISERROR ('Quantity is not sufficient' ,10,1)
      ROLLBACK TRANSACTION

END

SQL插入触发条件语句和多行

2 个答案: