Question

CREATE TABLE [dbo].[OrderDetails](
    [OrderID] [int] NOT NULL,
    [ProductID] [int] NOT NULL,
    [UnitPrice] [int] NOT NULL,
    [Quantity] [tinyint] NULL,
    [Discount] [int] NULL,
    [IsActive] [bit] NULL,
    [IsDeleted] [bit] NULL
) ON [PRIMARY]

我想创建一个功能，检查插入的数量是否大于库存数量，然后阻止用户执行。

Answer 1

GO

SET QUOTED_IDENTIFIER ON; GO

在dbo.OrderDetails上创建TRIGGER dbo.PreventQtyInsert 插入后如开始 DECLARE @returnQuantity INT， @Quantity INT， @ProductID INT， @GetQuantityFromProductsTable INT;

    SELECT @returnQuantity = dbo.ReturnUnitsInStock ( @Quantity , @ProductID ) ;

    IF @returnQuantity = 0
        BEGIN
            RAISERROR ( 'This vendor''s credit rating is too low to accept new purchase orders.' , 16 , 1 ) ;
            ROLLBACK TRANSACTION;
            RETURN;
        END;
    ELSE
        BEGIN

            SET @GetQuantityFromProductsTable = ( SELECT UnitsInStock FROM Products WHERE ProductID = @ProductID ) ;
            UPDATE OrderDetails SET Quantity = @GetQuantityFromProductsTable - @Quantity
            WHERE ProductID = @ProductID;


        END;

END;

GO

创建一个功能以检查插入的数量是否大于库存数量

1 个答案: