MySQL Stored Procedure to create user

Question

I am trying to create a stored procedure to create user in mysql server 5.6.21 but it throws the following error:

Error Code: 1445. Not allowed to set autocommit from a stored function or trigger.

the code below:

CREATE PROCEDURE `add_User`(IN p_Name VARCHAR(45), IN p_Passw VARCHAR(200))
BEGIN

    DECLARE flag_exist TINYINT(1) DEFAULT 0;

    SELECT COUNT(*)
    INTO flag_exist 
    FROM
        `mysql`.`USER`
    WHERE
        `mysql`.`USER`.`User` = p_Name;

    IF flag_exist = 0 THEN 
        CREATE USER p_Name;
        GRANT ALL PRIVILEGES ON *.* TO p_Name;
        SET PASSWORD FOR p_Name = PASSWORD (p_Passw);
        FLUSH PRIVILEGES;

        /* NO FOUNT
            INSERT INTO user VALUES
            ('localhost',p_Name,PASSWORD(p_Passw),'Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y');
        */
    END IF;

END

Answer 1

Maybe this will give you some ideas:

DELIMITER $$

DROP PROCEDURE IF EXISTS `add_User`$$

CREATE PROCEDURE `add_User`(IN `p_Name` VARCHAR(45), IN `p_Passw` VARCHAR(200))
BEGIN
    DECLARE `_HOST` CHAR(14) DEFAULT '@\'localhost\'';
    SET `p_Name` := CONCAT('\'', REPLACE(TRIM(`p_Name`), CHAR(39), CONCAT(CHAR(92), CHAR(39))), '\''),
    `p_Passw` := CONCAT('\'', REPLACE(`p_Passw`, CHAR(39), CONCAT(CHAR(92), CHAR(39))), '\'');
    SET @`sql` := CONCAT('CREATE USER ', `p_Name`, `_HOST`, ' IDENTIFIED BY ', `p_Passw`);
    PREPARE `stmt` FROM @`sql`;
    EXECUTE `stmt`;
    SET @`sql` := CONCAT('GRANT ALL PRIVILEGES ON *.* TO ', `p_Name`, `_HOST`);
    PREPARE `stmt` FROM @`sql`;
    EXECUTE `stmt`;
    DEALLOCATE PREPARE `stmt`;
    FLUSH PRIVILEGES;
END$$

DELIMITER ;