[英]inserting from a table to another table and activeting trigger
INSERT INTO SaleItem (ProdId, SaleQuantity)
SELECT ProdId, BasketProdQuantity FROM Basket;
CREATE TRIGGER TRG_Stock_Decrease
ON SaleItem
AFTER INSERT
AS
DECLARE @ProdId INT
DECLARE @SaleQuantity INT
SELECT @ProdId=ProdId,@SaleQuantity=SaleQuantity FROM inserted
UPDATE Product SET ProdStockQuantity=ProdStockQuantity-@SaleQuantity WHERE ProdId=@ProdId
UPDATE Product SET ProdNoOfSold =ProdNoOfSold+@SaleQuantity WHERE ProdId=@ProdId
DELETE FROM Basket Where ProdId = @ProdId
當我將數據從Basket插入SaleItem時,它運行良好,但觸發僅適用於插入的第一個id。 如何讓它適用於所有ID?
編輯! 我改變了我的觸發器,我覺得它有點工作。
CREATE TRIGGER TRG_Stock_Decrease
ON SaleItem
AFTER INSERT
AS
BEGIN
UPDATE Product SET ProdStockQuantity = ProdStockQuantity - (Select SaleQuantity From inserted Where Product.ProdId = inserted.ProdId ) Where Product.ProdId IN (Select ProdId From inserted)
UPDATE Product SET ProdNoOfSold =ProdNoOfSold + (Select SaleQuantity From inserted Where Product.ProdId = inserted.ProdId ) Where Product.ProdId IN (Select ProdId From inserted)
DELETE FROM Basket WHERE Basket.ProdId IN (Select ProdId From inserted)
END
那是對的嗎?
不需要每行或嵌套選擇,只需插入內部連接:)
CREATE TRIGGER TRG_Stock_Decrease
ON SaleItem
AFTER INSERT
AS
UPDATE P
SET ProdStockQuantity=ProdStockQuantity-i.SaleQuantity,
ProdNoOfSold =ProdNoOfSold+i.SaleQuantity
FROM Product P
INNER JOIN inserted i
ON P.ProdId=i.ProdId
DELETE B
FROM Basket B
INNER JOIN inserted i
ON i.ProdId = B.ProdId
添加FOR EACH ROW
DROP TRIGGER `TRG_Stock_Decrease`;
DELIMITER //
CREATE TRIGGER TRG_Stock_Decrease
AFTER INSERT ON `TABLE` FOR EACH ROW
BEGIN
DECLARE @ProdId INT;
DECLARE @SaleQuantity INT;
SELECT @ProdId=ProdId,@SaleQuantity=SaleQuantity FROM inserted;
UPDATE Product SET ProdStockQuantity=ProdStockQuantity-@SaleQuantity WHERE ProdId=@ProdId;
UPDATE Product SET ProdNoOfSold =ProdNoOfSold+@SaleQuantity WHERE ProdId=@ProdId;
DELETE FROM Basket Where ProdId = @ProdId;
END; //
DELIMITER ;
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