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MYSQL 无root用户或root用户被删除解决方法

注：先改变文件my.ini mysqld下加入skip-grant-tables

Microsoft Windows [版本 10.0.14393]

C:\WINDOWS\system32>cd C:\Program Files\MySQL\MySQL Server 5.7\bin

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root -p

Enter password: ******

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.12-log MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use mysql

Database changed

mysql> UPDATE user SET authentication_string=PASSWORD('111111') where USER='root';

Query OK, 0 rows affected, 1 warning (0.00 sec)

Rows matched: 0 Changed: 0 Warnings: 1

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> select * from user;

+-----------+-----------+-------------+-------------+-------------+-------------+-------------+-----------+-------------+---------------+--------------+-----------+------------+-----------------+------------+------------+--------------+------------+-----------------------+------------------+--------------+-----------------+------------------+------------------+----------------+---------------------+--------------------+------------------+------------+--------------+------------------------+----------+------------+-------------+--------------+---------------+-------------+-----------------+----------------------+-----------------------+-------------------------------------------+------------------+-----------------------+-------------------+----------------+

| localhost | mysql.sys | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | N | | | | | 0 | 0 | 0 | 0 | mysql_native_password | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | N | 2016-04-20 00:15:15 | NULL | Y |

1 row in set (0.00 sec)

mysql> quit;

Bye

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root -p

Enter password: ******

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.12-log MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use mysql;

Database changed

mysql> update user set password=PASSWORD("111111") where user="root";

ERROR 1054 (42S22): Unknown column 'password' in 'field list'

mysql> update user set authentication_string=PASSWORD("111111") where user="root";

Query OK, 0 rows affected, 1 warning (0.00 sec)

Rows matched: 0 Changed: 0 Warnings: 1

mysql> select count(*) from user;

+----------+

| count(*) |

+----------+

| 1 |

+----------+

1 row in set (0.00 sec)

mysql> select * from user where user="root";

Empty set (0.00 sec)

mysql> select user from user ;

+-----------+

| user |

+-----------+

| mysql.sys |

+-----------+

1 row in set (0.00 sec)

mysql> insert into user set user='root',ssl_cipher='',x509_issuer='',x509_subject='';

Query OK, 1 row affected (0.00 sec)

mysql> update user set Host='localhost',select_priv='y', insert_priv='y',update_priv='y',Alter_priv='y',delete_priv='y',create_priv='y',drop_priv='y',reload_priv='y',shutdown_priv='y',Process_priv='y',file_priv='y',grant_priv='y',References_priv='y',index_priv='y',show_db_priv='y',super_priv='y',create_tmp_table_priv='y',Lock_tables_priv='y',execute_priv='y',repl_slave_priv='y',repl_client_priv='y',create_view_priv='y',show_view_priv='y',create_routine_priv='y',alter_routine_priv='y',create_user_priv='y' where user='root';

Query OK, 1 row affected (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 0

mysql> quit;

Bye

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -uroot -p

Enter password:

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 3

Server version: 5.7.12-log MySQL Community Server (GPL)

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> update user set authtication_string=PASSWORD("111111") where user="root";

ERROR 1046 (3D000): No database selected

mysql> user mysql;

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 'user mysql' at line 1

mysql> use mysql;

Database changed

mysql> update user set authtication_string=PASSWORD("111111") where user="root";

ERROR 1054 (42S22): Unknown column 'authtication_string' in 'field list'

mysql> update user set authentication_string=PASSWORD("111111") where user="root";

Query OK, 1 row affected, 1 warning (0.00 sec)

Rows matched: 1 Changed: 1 Warnings: 1

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

mysql> quit;

Bye

C:\Program Files\MySQL\MySQL Server 5.7\bin>mysql -u root -p