Question

CREATE USER IF NOT EXISTS ...

创建一个没有问题的新用户。现有用户返回该错误，但文档读取CREATE USER for MySQL > 5.7.6支持该错误。

MySQL版本

Ver 14.14 Distrib 5.7.11, for osx10.9 (x86_64) using  EditLine wrapper

样品

<root:none> CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar';
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CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar'
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Query OK, 0 rows affected (0.00 sec)

<root:none> CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar';
--------------
CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar'
--------------

ERROR 1396 (HY000): Operation CREATE USER failed for 'foo'@'localhost'

建议？

Answer 1

如果您使用CREATE USER IF NOT EXISTS子句并且用户确实存在，则

IDENTIFIED BY会引发错误。如果您不使用IDENTIFIED BY子句，它不会抛出错误并按预期工作。

mysql> CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar';
Query OK, 0 rows affected (0.01 sec)

mysql> CREATE USER IF NOT EXISTS 'foo'@'localhost' IDENTIFIED BY 'bar';
ERROR 1396 (HY000): Operation CREATE USER failed for 'foo'@'localhost'

mysql> CREATE USER IF NOT EXISTS 'foo'@'localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)

从5.7.8开始，您可以在使用CREATE USER IF NOT EXISTS子句调用DROP USER IF EXISTS之前使用CREATE USER，而不是使用IDENTIFIED BY。

mysql> DROP USER 'foo'@'localhost';
Query OK, 0 rows affected (0.00 sec)

mysql> DROP USER 'foo'@'localhost';
ERROR 1396 (HY000): Operation DROP USER failed for 'foo'@'localhost'

mysql> DROP USER IF EXISTS 'foo'@'localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)

另一个选项是先创建用户，然后在创建用户后设置密码。

mysql> CREATE USER IF NOT EXISTS 'foo'@'localhost';
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE USER IF NOT EXISTS 'foo'@'localhost';
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> SET PASSWORD FOR 'foo'@'localhost' = 'bar';
Query OK, 0 rows affected (0.01 sec)

Answer 2

尝试执行FLUSH特权。

FLUSH PRIVILEGES;
GRANT ALL ON *.* TO 'foo'@'localhost';

您可以查看链接。它可能对你有帮助

link

MySQL - 创建用户，如果不是存在

2 个答案: