分享程序员开发的那些事...
更新时间：2022-09-27 22:21:43
当初次安装完mysql后，可以免口令直接登陆mysql。
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[root@plinuxos ~]# /usr/local/mysql/bin/mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
更改口令
1、更改PATH，增加MySQL路径
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[root@plinuxos ~]# export PATH=$PATH:/usr/local/mysql/bin/
[root@plinuxos ~]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 2
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
这样，可以直接通过mysql命令登陆，而不再需要写绝对路径。如果要想永久生效，必须要添加到profile配置中。
2、设置密码
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[root@plinuxos ~]# mysqladmin -uroot password '123456'
Warning: Using a password on the command line interface can be insecure.
[root@plinuxos ~]# mysql -uroot
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@plinuxos ~]# mysql -uroot -p123456
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 id is 5
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
3、修改密码
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[root@plinuxos ~]# mysqladmin -uroot -p123456 password 'abcdefg'
Warning: Using a password on the command line interface can be insecure.
[root@plinuxos ~]# mysql -uroot -pabcdefg
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 id is 7
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
4、忘记密码时，重置密码
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[root@plinuxos ~]# vi /etc/my.cnf
[mysqld]skip-grant ##新增该行，跳过授权
......[root@plinuxos ~]# /etc/init.d/mysqld restart
Shutting down MySQL.. SUCCESS! Starting MySQL. SUCCESS! [root@plinuxos ~]# mysql -uroot
Welcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql;Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -ADatabase changedmysql> update user set password=password('88888888') where user='root';
Query OK, 4 rows affected (0.01 sec)Rows matched: 4 Changed: 4 Warnings: 0mysql> select password from user where user='root';
+-------------------------------------------+| password |+-------------------------------------------+| *CB4AD0A70FCCF86E95DB2214F209ACB191DB847B || *CB4AD0A70FCCF86E95DB2214F209ACB191DB847B || *CB4AD0A70FCCF86E95DB2214F209ACB191DB847B || *CB4AD0A70FCCF86E95DB2214F209ACB191DB847B |+-------------------------------------------+4 rows in set (0.00 sec)
mysql> exit;
Bye[root@plinuxos ~]# mysql -uroot -p88888888
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 id is 2
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
连接MySQL
1、远程连接MySQL数据库
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[root@plinuxos ~]# mysql -uroot -p88888888
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 id is 3
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> exit;
Bye[root@plinuxos ~]# mysql -uroot -p88888888 -h127.0.0.1 -P3306
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 id is 4
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
2、使用socket连接数据库
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[root@plinuxos ~]# mysql -uroot -p88888888 -S/tmp/mysql.sock
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 id is 5
Server version: 5.6.35 MySQL Community Server (GPL)Copyright (c) 2000, 2016, 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 respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> |
3、数据库外快速执行命令
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[root@plinuxos ~]# mysql -uroot -p88888888 -e "show databases"
Warning: Using a password on the command line interface can be insecure.
+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |
+--------------------+ |
常用命令
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mysql> show databases; ##显示数据库
mysql> use mysql; ##切换数据库
mysql> show tables; ##显示表
mysql> desc columns_priv; ##查看columns_priv表
mysql> show create table columns_priv\G; ##查看columns_priv的创建语句
mysql> select user(); ##查看当前登陆用户
mysql> select database(); ##查看当前数据库
mysql> create database db1; ##创建数据库db1
mysql> use db1;create table t1(`id` int(4),`name` char(40)); ##创建数据库和表
mysql> drop table t1; ##删除表
mysql> select version(); ##查看mysql版本
mysql> show status; ##查看数据库状态
mysql> show variables; ##查看参数
mysql> show variables like 'max_connect%'; ##模糊查询参数
mysql> set global max_connect_errors=1000;##修改参数的值，若要永久生效，在/etc/my.cnf配置
mysql> show processlist; ##查看队列
mysql> show full processlist; ##查看完整的队列信息
本文转自Grodd51CTO博客，原文链接：http://blog.51cto.com/juispan/1958191，如需转载请自行联系原作者
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