mysql root權限修改、恢復

原文地址：http://blog.csdn.net/kaly3845/article/details/8808529

當root權限失去某些權限後，如何恢復這個權限？

    1.  可以進入數據庫，但無update權限：

操作過程：在WINDOWS的DOS窗口下，進入MYSQL安裝目錄的BIN目錄，
                    運行mysqld-nt --skip-grant-tables，當前窗口將會停止。
                    另外打開一個命令行窗口，執行mysql 如果提示沒有這個命令，先進入MYSQL的安裝位置下BIN目錄再運行mysql 
                     >use mysql 
                     >update user set Update_priv ='Y' where user = 'root';                    

                    如果root 沒有所有數據的權限

                    更新的MYSQL.USER表的所有字段中爲Ｎ的爲Ｙ就可以了。

                    update user set Select_priv ='Y' where user = 'root';

                    update user set Insert_priv ='Y' where user = 'root';
                    update user set Update_priv ='Y' where user = 'root';
                    update user set Delete_priv ='Y' where user = 'root';
                    update user set Create_priv ='Y' where user = 'root';
                    update user set Drop_priv ='Y' where user = 'root';
                    update user set Reload_priv ='Y' where user = 'root';
                    update user set Shutdown_priv ='Y' where user = 'root';
                    update user set Process_priv ='Y' where user = 'root';
                    update user set File_priv ='Y' where user = 'root';
                    update user set Grant_priv ='Y' where user = 'root';
                    update user set References_priv ='Y' where user = 'root';
                    update user set Index_priv ='Y' where user = 'root';

                    update user set Alter_priv ='Y' where user = 'root';
                    update user set Show_db_priv ='Y' where user = 'root';
                    update user set Super_priv ='Y' where user = 'root';
                    update user set Create_tmp_table_priv ='Y' where user = 'root';
                    update user set Lock_tables_priv ='Y' where user = 'root';
                    update user set Execute_priv ='Y' where user = 'root';
                    update user set Repl_slave_priv ='Y' where user = 'root';
                    update user set Repl_client_priv ='Y' where user = 'root';
                    update user set Create_view_priv ='Y' where user = 'root';
                    update user set Show_view_priv ='Y' where user = 'root';
                    update user set Create_routine_priv ='Y' where user = 'root';
                    update user set Alter_routine_priv ='Y' where user = 'root';

                    update user set Create_user_priv ='Y' where user = 'root';
                    update user set Event_priv ='Y' where user = 'root';
                    update user set Trigger_priv ='Y' where user = 'root';

 

                    權限問題最後要保證“mysql.user”表中 host爲“localhost”和“%”都有root的所有權限。

         host列是指定登錄的ip，比如說 user=root host=192.168.1.1 ，這裏的意思就是說，root用戶只能通過 192.168.1.1的客戶端去訪問，而%則是個通配符， 如果host=192.168.1.%，那麼就表示 只要是 ip爲host=192.168.1.前綴的客戶端都可以連接，那麼host=%的話則表示所有ip都有權去連接，這也就是爲什麼在開啓遠程連接的時候，大部分人都直接把host改成%的緣故，因爲省事

 

   2. 忘記密碼，無法連接數據庫：

解決辦法：

                      同樣的，利用命令行，跳過mysql的服務認證

                      >cd  ../bin           //進入Mysql路徑下的bin目錄中

                      >mysqld-nt --skip-grant-tables  //讓mysql服務跳過認證運行,保持這個窗口不關閉 

                     （|>bin/safe_mysqld --skip-grant-tables &  //Linux下）

 

                        >mysql -uroot         //另打開一個shell,執行Mysql

                        >use   mysql          //切換數據庫爲mysql

                        >update user set password=password("new_pass") where user="root";  //更新用戶密碼

                        >flush privileges;    //更新Mysql權限表

                        >exit                 //退出Mysql

                        >exit                 //關閉shell