MySQL - 使用存儲過程設置用戶密碼

Question

我想使用MySQL中的存儲過程更改用戶的密碼。

下面是創建代碼：

CREATE SCHEMA `try` ; 
USE try; 
CREATE TABLE `users` (
`username` VARCHAR(100) NOT NULL, 
`password` VARCHAR(100) NOT NULL, 
PRIMARY KEY(`username`)); 

insert into users values('Admin','pass'); 

create user 'usertry'@'localhost' identified by 'pass'; 
grant select on try.* to 'usertry'@'localhost'; 
grant insert on try.* to 'usertry'@'localhost'; 
grant update on try.* to 'usertry'@'localhost'; 
grant delete on try.* to 'usertry'@'localhost'; 

直到這裏，一切都很好。 然後我創建了一個存儲過程來更改表「用戶」。

DELIMITER $$ 
CREATE PROCEDURE `changeusers` (
IN user VARCHAR(255), 
IN pass VARCHAR(255), 
IN newuser VARCHAR(255), 
IN newpass VARCHAR(255), 
OUT result bool) 
BEGIN 
if(user= Binary (Select username from users limit 1) 
and pass= Binary (Select password from users limit 1)) 
    then 
     delete from users where username=user; 
     insert into users values(newuser,newpass); 
     set result=true; 
    else 
     set result=false; 
end if; 
select result; 
END $$ DELIMITER ; 

當我調用存儲過程時，它工作正常。

call changeusers('Admin','pass','Admin','new',@result); 

call changeusers('Admin','pass','Admin','new',@result) 1 row(s) returned 0.141 sec/0.000 sec 

然後我試圖改變存儲過程來設置用戶的密碼相同的用戶表中的密碼。

DELIMITER $$ 
CREATE PROCEDURE `changeusers` (
IN user VARCHAR(255), 
IN pass VARCHAR(255), 
IN newuser VARCHAR(255), 
IN newpass VARCHAR(255), 
OUT result bool) 
BEGIN 
if(user= Binary (Select username from users limit 1) 
and pass= Binary (Select password from users limit 1)) 
    then 
     delete from users where username=user; 
     insert into users values(newuser,newpass); 

     /*The added line*/ 
     set password for 'usertry'@'localhost' = newpass; 
     /*The added line*/ 

     set result=true; 
    else 
     set result=false; 
end if; 
select result; 
END $$ DELIMITER ; 

但是當我運行新的腳本我得到這個：

Error Code: 1064. You have an error in your SQL syntax; 
    check the manual that corresponds to your MySQL server version 
    for the right syntax to use near 
     'newpass; 
      set result=true;   
     else    
      set result=false;' 
    at line 13 0.000 sec 

我會apreciate任何sugestions。 謝謝。

編輯

感謝@Barmar。我能夠做我想做的事。 這是新的存儲過程。

DELIMITER $$ 
CREATE PROCEDURE `changeusers` (
IN user VARCHAR(255), 
IN pass VARCHAR(255), 
IN newuser VARCHAR(255), 
IN newpass VARCHAR(255), 
OUT result bool) 
BEGIN 
if(user= Binary (Select username from users limit 1) 
and pass= Binary (Select password from users limit 1)) 
    then 
     delete from users where username=user; 
     insert into users values(newuser,newpass); 

     /*The added line*/ 
     set @stm = CONCAT("set password for 'usertry'@'localhost' = ",newpass); 
     prepare stmt from @stm; 
     execute stmt; 
     deallocate prepare stmt; 
     /*The added line*/ 

     set result=true; 
    else 
     set result=false; 
end if; 
select result; 
END $$ DELIMITER ; 

非常感謝您的幫助。

Answer 1

我不認爲SET PASSWORD允許密碼是一個變量，它必須是一個文本（或文字參數PASSWORD()通話所以，你需要使用一個事先準備好的聲明：

PREPARE @stmt FROM CONCAT("SET PASSWORD FOR 'usertry'@'localhost' = '", newpass, "'"); 
EXECUTE @stmt;