Question

我在显示错误消息方面遇到了一些问题，这就是我写的内容：

     DELIMITER go
        Create procedure getusers(
         IN iEmailAddress varchar(30),
             IN iPassword varchar(30))

        BEGIN
        DECLARE EXIT HANDLER FOR SQLEXCEPTION
    -- this one is for checking the empty email address and it suppose to 
    -- display an error message.
        Select EmailAddress from users
        where not exists( select EmailAddress
        from users where EmailAddress=iEmailAddress
         SIGNAL SQLSTATE VALUE '99999'
              SET MESSAGE_TEXT = 'Email Address does not exists';
        )

        End
        BEGIN
        DECLARE EXIT HANDLER FOR SQLEXCEPTION
-- this one is for checking the empty password and it suppose to 
    -- display an error message.
        Select Password from users
        where not exists( select Password
        from users where Password=iPassword
         SIGNAL SQLSTATE VALUE '99999'
              SET MESSAGE_TEXT = 'Password does not exists';
        )

        End


        BEGIN
        Select EmailAddress, Password,Salt,RoleID,UserID from users
        where EmailAddress = iEmailAddress and PASSWORD = iPassword;
        End
        go
        DELIMITER ;

我收到一条错误消息：

MySQL说：文档 1064 - 您的SQL语法出错;检查与您的MySQL服务器版本对应的手册，以便在'SIGNAL SQLSTATE VALUE'999999'附近使用正确的语法 SET MESSAGE_TEXT ='电子邮件地址不在第10行“

我已将该链接用于参考：http://dev.mysql.com/doc/refman/5.7/en/signal.html

Answer 1

我解决了问题，解决方案是：

> DELIMITER go Create procedure getusers(  IN iEmailAddress varchar(30),
> IN iPassword varchar(30)) BEGIN declare checkemailcount int; declare
> checkpasswordcount int;
> 
> select count(emailaddress) into checkemailcount from users where
> emailaddress = iEmailaddress;
> 
> select count(Password) into checkpasswordcount from users where
> Password = iPassword;
> 
> --check if emailaddress  not exists
> 
> If(checkemailcount!=1) then SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT =
> 'Email address is not found';
> 
> --check if password not exists
> 
> Elseif (checkpasswordcount!=1) then SIGNAL SQLSTATE '45000' SET
> MESSAGE_TEXT = 'Invalid Password'; else
> 
>   select emailaddress,password,salt,UserID from users    where
> emailaddress=iEmailaddress and password = iPassword;
> 
> 
> End if; End go DELIMITER ;

存储过程中的mysql错误消息

1 个答案: