mysql创建用户(如果不存在)

问题描述：

我有一个查询来检查mysql用户列表以创建新用户.

I have a query to check mysql users list for create new user.

IF (SELECT EXISTS(SELECT 1 FROM `mysql`.`user` WHERE `user` = '{{ title }}')) = 0 THEN
    CREATE USER '{{ title }}'@'localhost' IDENTIFIED BY '{{ password }}'
END IF;

但是我得到这个错误:

ERROR 1064 (42000) at line 3: 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 'IF (SELECT EXISTS(SELECT 1 FROM `mysql`.`user` WHERE `user` = 'cms_localhost')) = 0 ' at line 1

答

在5.7.6及更高版本中，您应该能够使用

In 5.7.6 and above, you should be able to use CREATE USER

CREATE USER IF NOT EXISTS 'user'@'localhost' IDENTIFIED BY 'password';

请注意，5.7.6方法实际上并未授予任何权限.

Note that the 5.7.6 method doesn't actually grant any permissions.

如果您使用的不是具有此功能的版本(低于5.7.6)，则可以执行以下操作:

If you aren't using a version which has this capability (something below 5.7.6), you can do the following:

GRANT ALL ON `database`.* TO 'user'@'localhost' IDENTIFIED BY 'password';

这将创建一个不存在的用户

This will create the user if it doesn't exist

请注意，如果您使用的是MySQL 8，则GRANT ALL方法将不会创建用户.

Note, if you are on MySQL 8, the GRANT ALL method will not create a user.

mysql创建用户(如果不存在)

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