1
我写了下面的存储过程:为什么在这个select语句中没有设置变量?
ALTER PROCEDURE [dbo].[sp_Accounts_ValidateLogin]
@EmailAddress varchar(255),
@Password varchar(20)
AS
DECLARE @UserID int
SELECT @UserID = UserID
FROM Accounts_Users
WHERE EmailAddress = @EmailAddress and Password = @Password
IF @UserID != NULL
RETURN @UserID
ELSE
RETURN -1
当执行这个程序就说明,
No rows affected.
(0 row(s) returned)
@RETURN_VALUE = -1
但每当我重写SELECT
语句,
SELECT UserID
FROM Accounts_Users
WHERE EmailAddress = @EmailAddress and Password = @Password
结果是:
UserID
---------------------------------------------------------------------------------------
3
No rows affected.
(1 row(s) returned)
@RETURN_VALUE = -1
我的问题是为什么变量@UserID
是没有设置里面的第一选择声明?