mysql - 如何用MySQL准备语句写 "create user ?"

Question

我试过:

SET @user = 'foo@localhost';
SET @pass = 'bar';
SET @sql = 'CREATE USER ? IDENTIFIED BY ?';
PREPARE stmt FROM $sql;

我得到错误

ERROR 1064 (42000): 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 '? IDENTIFIED BY ?'

我也尝试了多种变体如何定义变量，但仍然没有任何运气。

SET @user = "'foo'@'localhost'";
SET @sql = 'CREATE USER ? IDENTIFIED BY ?';

甚至

SET @user = 'foo';
SET @host = 'localhost';
SET @sql = 'CREATE USER ?@? IDENTIFIED BY ?';

两年多前已经问过非常相似的问题，但仍然没有有用的答案:( Create User with MySQLi Prepared Statement

Answer 1

这是我设法创建用户的唯一方法，不幸的是它没有为用户变量使用占位符:

SET @user := 'foo';
SET @host := 'localhost';
SET @pass := 'bar';
SET @sql := CONCAT("CREATE USER ", QUOTE(@user), "@", QUOTE(@host), " IDENTIFIED BY ", QUOTE(@pass));
PREPARE stmt FROM @sql;
EXECUTE stmt;

附言{创建 |重命名 |从 MySQL 5.1.12 开始应该支持 DROP} USER 语句