95.更改MySQL的root用户密码,MySQL基本操作的常用命令

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[root@sdwaqw ~]# mysqladmin -uroot password '123456'                  //在实际生产环境中请勿设置如此简单的密码　　Warning: Using a password on the command line interface can be insecure.
　　[root@sdwaqw ~]# mysqladmin -uroot password '123456'
　　Warning: Using a password on the command line interface can be insecure.
　　[root@sdwaqw ~]# mysql -uroot     //设置好密码之后，再次使用之前的登录密令就报错了
　　ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
　　[root@sdwaqw ~]# mysql -uroot -p123456     //输入密码后再登录，-p选项后面直接跟密码，不能有空格
　　Warning: Using a password on the command line interface can be insecure.
　　Welcome to the MySQL monitor.  Commands end with ; or \g.

　　Your MySQL connection>　　Server version: 5.6.36 MySQL Community Server (GPL)
　　Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
　　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> quit
　　Bye
　　[root@sdwaqw ~]# mysql -uroot -p     //-p后面不加密码，以交互的形式输入密码
　　Enter password:
　　Welcome to the MySQL monitor.  Commands end with ; or \g.

　　Your MySQL connection>　　Server version: 5.6.36 MySQL Community Server (GPL)
　　Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
　　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> exit
　　Bye
　　[root@sdwaqw ~]# mysqladmin -uroot -p123456 password 'sdwaqw'   //修改密码
　　Warning: Using a password on the command line interface can be insecure.
　　[root@sdwaqw ~]# mysql -uroot -psdwaqw     //使用新密码登录
　　Warning: Using a password on the command line interface can be insecure.
　　Welcome to the MySQL monitor.  Commands end with ; or \g.

　　Your MySQL connection>　　Server version: 5.6.36 MySQL Community Server (GPL)
　　Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
　　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>
　　4、忘记root密码时的操作
　　[root@sdwaqw ~]# vim /etc/my.cnf
　　# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html# *** DO NOT EDIT THIS FILE. It's a template which will be copied to the# *** default location during install, and will be replaced if you# *** upgrade to a newer version of MySQL.
　　[mysqld]
　　skip-grant                                     //在[mysqld]下加入该字段
　　[root@sdwaqw ~]# /etc/init.d/mysqld restart      //重启mysql
　　Shutting down MySQL.. SUCCESS!
　　Starting MySQL. SUCCESS!
　　[root@sdwaqw ~]# mysql -uroot              //现在就无需密码了
　　Welcome to the MySQL monitor.  Commands end with ; or \g.

　　Your MySQL connection>　　Server version: 5.6.36 MySQL Community Server (GPL)
　　Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
　　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;                        //切换数据库
　　Reading table information for completion of table and column names
　　You can turn off this feature to get a quicker startup with -A
　　Database changed
　　mysql> update user set password=password('sdwaqw123456') where user='root';            //更新密码
　　Query OK, 4 rows affected (0.00 sec)
　　Rows matched: 4  Changed: 4  Warnings: 0
　　mysql> exit
　　Bye
　　[root@sdwaqw ~]# vim /etc/my.cnf    //删除skip-grant字段
　　[root@sdwaqw ~]# /etc/init.d/mysqld restart   //重启
　　Shutting down MySQL.. SUCCESS!
　　Starting MySQL. SUCCESS!
　　[root@sdwaqw ~]# mysql -uroot    //无法登陆了
　　ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
　　[root@sdwaqw ~]# mysql -uroot -psdwaqw123456    //使用新密码登录
　　Warning: Using a password on the command line interface can be insecure.
　　Welcome to the MySQL monitor.  Commands end with ; or \g.

　　Your MySQL connection>　　Server version: 5.6.36 MySQL Community Server (GPL)
　　Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
　　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> exit
　　Bye