mysql user表沒有了的解決辦法：1、在“[mysqld]”中添加“skip-grant-tables”；2、編輯my.cnf配置文件，添加“sql_mode=NO_ENGINE_SUBSTITUTION”；3、重啟mysql服務。
本文操作環境：Windows7系統，mysql5.5版，Dell G3電腦。
mysql user表沒有了怎么辦？
mysql 忘記密碼，重置密碼，mysql.user表為空的解決辦法：
一、用戶表有用戶，直接修改密碼
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
修改mysql配置文件my.cnf：
vim /etc/my.cnf
在[mysqld]中添加
skip-grant-tables
重啟mysql服務，用空密碼直接登錄，查詢用戶表，有結果則按如下步驟修改，結果為空直接最后的解決辦法
mysql> select Host,User,authentication_string from mysql.user; +-----------+---------------+-------------------------------------------+ | Host | User | authentication_string | +-----------+---------------+-------------------------------------------+ | localhost | root | *6A7A490FB9DC8C33C2B025A91737077A7E9CC5E5 | | localhost | mysql.session | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | localhost | mysql.sys | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | % | root | *6A7A490FB9DC8C33C2B025A91737077A7E9CC5E5 | +-----------+---------------+-------------------------------------------+ 4 rows in set (0.00 sec)
修改對應用戶的密碼
# 重置密碼為 123456 mysql> update mysql.user set authentication_string=password('123456') where user='root' Query OK, 2 rows affected, 1 warning (0.00 sec) Rows matched: 2 Changed: 2 Warnings: 1 # 刷新權限，使配置生效 mysql> FLUSH PRIVILEGES; Query OK, 0 rows affected (0.00 sec) # 退出 mysql> quit Bye
取消或注釋掉my.cnf配置文件添加的選項 skip-grant-tables ，重啟mysql服務，搞定收工。
二、用戶表沒有數據，則需要插入用戶數據
mysql> select Host,User,authentication_string from mysql.user; Empty set (0.00 sec) # 退出登陸 mysql> exit Bye
編輯my.cnf配置文件，添加或修改下面兩項（我這沒有sql_mode項）：
sql_mode=NO_ENGINE_SUBSTITUTION skip-grant-tables
- 停止mysql服務，啟動數據庫的安全模式：mysqld_safe &
- 使用root 空密碼連接數據庫： mysql -uroot -p
插入root用戶數據
mysql> insert into mysql.user(Host,User,authentication_string) values("%","root",password("123456")); Query OK, 1 row affected, 4 warnings (0.00 sec)
再次查詢mysql.user表，會報錯
mysql> select Host,User,authentication_string from mysql.user; ERROR 1194 (HY000): Table 'user' is marked as crashed and should be repaired
需要修復mysql.user表
mysql> REPAIR TABLE mysql.user; +------------+--------+----------+-------------------------------------------------+ | Table | Op | Msg_type | Msg_text | +------------+--------+----------+-------------------------------------------------+ | mysql.user | repair | info | Wrong bytesec: 113-108- 95 at 396; Skipped | | mysql.user | repair | info | Found block that points outside data file at 32 | | mysql.user | repair | info | Found block that points outside data file at 36 | | mysql.user | repair | info | Found block that points outside data file at 40 | | mysql.user | repair | info | Found block that points outside data file at 44 | | mysql.user | repair | info | Found block that points outside data file at 48 | | mysql.user | repair | info | Found block that points outside data file at 52 | | mysql.user | repair | info | Found block that points outside data file at 56 | | mysql.user | repair | info | Found block that points outside data file at 60 | | mysql.user | repair | warning | Number of rows changed from 4 to 3 | | mysql.user | repair | status | OK | +------------+--------+----------+-------------------------------------------------+ 11 rows in set (0.64 sec) # 再次查詢user表 mysql> select Host,User,authentication_string from mysql.user; +-----------+---------------+-------------------------------------------+ | Host | User | authentication_string | +-----------+---------------+-------------------------------------------+ | localhost | mysql.session | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | localhost | mysql.sys | *THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE | | % | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 | +-----------+---------------+-------------------------------------------+ 3 rows in set (0.00 sec)
修改root用戶的權限：
update mysql.user set `Select_priv` = 'Y', `Insert_priv` = 'Y', `Update_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', `Alter_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', `Event_priv` = 'Y', `Trigger_priv` = 'Y', `Create_tablespace_priv` = 'Y' where user='root'; # 更新權限 mysql> flush privileges; Query OK, 0 rows affected (0.00 sec) # 退出登陸 mysql> exit Bye
- 退出mysql，將my.cnf配置文件的修改恢復
- 結束mysqld_safe 進程：pkill mysql
-
啟動mysql服務: systemctl start mysql
問題解決！
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