Question

我在SQL Server数据库中有一个表E-mail，Mobile Number，AuthCode，UserID。

当我添加新用户时，AuthCode列应填充如下值：

UserID+Mobile Number.

像这样：如果新用户的移动设备号为05518602015，用户ID（自动递增）为2，则AuthCode列应自动填充205518602015。

我该怎么做？我是SQL Server新手

已解决：使用触发器。

Answer 1

您可以将triggers用于此目的：

CREATE TRIGGER triggername  
ON dbo.YourTableName
AFTER INSERT, UPDATE   
AS
BEGIN
    UPDATE Y
    SET AuthCode = CAST(i.UserID AS NVARCHAR(10)) + CAST(i.[Mobile Number] AS NVARCHAR(20))
    FROM YourTableName Y
    INNER JOIN inserted i ON Y.someID = i.someID
END

在插入的行上插入/更新操作后，它将更新您需要的列。

Answer 2

简单的计算列怎么样？

CREATE TABLE #Test (
        UserID INT IDENTITY(1,1),
        Email NVARCHAR(50), 
        MobileNumber NVARCHAR(100), 
        AuthCode AS CAST(UserID AS NVARCHAR(10)) + MobileNumber
        )


INSERT INTO #Test(Email, MobileNumber) VALUES (N'blah@somewhere.com', N'0123456790')

SELECT * FROM #Test

UserID      Email                 MobileNumber     AuthCode
----------- --------------------- ---------------- ----------------
1           blah@somewhere.com    0123456790       10123456790

(1 row(s) affected)

Answer 3

UPDATE dbo.City 
SET Auth = CONCAT(CONVERT(VARCHAR(10), CityId), CityName)

以上查询将根据您的需要设置数据，您可以使用条件更新特定数据

Answer 4

您必须分两步完成，首先添加用户，然后更新AuthCode，

CREATE TABLE #Users (
        UserID INT IDENTITY(1,1),
        Email VARCHAR(100), 
        MobileNumber VARCHAR(20), 
        AuthCode VARCHAR(50)
        )

DECLARE @NewUserID      INT,
        @Email          VARCHAR(100),
        @MobileNumber   VARCHAR(20),
        @AuthCode       VARCHAR(50)

SELECT  @Email = 'usertestmail@gmail.com'
        ,@MobileNumber = '05518602015'

-- Add new user
INSERT INTO #Users(Email, MobileNumber)
VALUES (@Email, @MobileNumber)

SET @NewUserID = SCOPE_IDENTITY()  -- this will give the Identity of the newly added row

SET @AuthCode = CAST(@NewUserID AS VARCHAR(20)) + @MobileNumber

--SELECT @AuthCode

-- update the Auth code
UPDATE u
SET AuthCode = @AuthCode
FROM #Users u
WHERE u.UserID = @NewUserID

SELECT * FROM #Users

输出

UserID      Email                     MobileNumber   AuthCode     
----------- ------------------------- -------------- -------------
1           usertestmail@gmail.com    05518602015    105518602015

SQL自动创建一个值列

4 个答案:

输出