我写了一个存储过程来返回一个计数.但我得到了一个空值.任何人都可以告诉我存储过程中的问题在哪里.
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[ValidateUser]
@UserName varchar(50),@Password varchar(50),@Num_of_User int output
AS
BEGIN
SET NOCOUNT ON;
SELECT @Num_of_user =COUNT(*)
FROM login
WHERE username = @UserName
AND pw = @Password
RETURN
END
解决方法
您将值设置为变量@num_of_user.在查询后添加select @num_of_user
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go
ALTER PROCEDURE [dbo].[ValidateUser]
@UserName varchar(50),@Num_of_User int output
AS
BEGIN
SET NOCOUNT ON;
SELECT @Num_of_user =COUNT(*)
FROM login
WHERE username=@UserName AND pw=@Password
SELECT @Num_of_user
return
END
