二十四节课预习

Posted 2021-01-09 linuxzhang

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13.1 设置更改root密码
13.2 连接mysql
13.3 mysql常用命令
13.4 mysql用户管理
13.5 常用sql语句
13.6 mysql数据库备份恢复
使用xtrabackup备份innodb引擎的数据库 innobackupex 备份 Xtrabackup 增量备份 http://zhangguangzhi.top/2017/08/23/innobackex%E5%B7%A5%E5%85%B7%E5%A4%87%E4%BB%BDmysql%E6%95%B0%E6%8D%AE/#%E4%B8%89%E3%80%81%E5%BC%80%E5%A7%8B%E6%81%A2%E5%A4%8Dmysql
相关视频
链接：http://pan.baidu.com/s/1miFpS9M 密码：86dx
链接：http://pan.baidu.com/s/1o7GXBBW 密码：ue2f

扩展
mysql5.7 root密码更改 http://www.apelearn.com/bbs/thread-7289-1-1.html
myisam 和innodb引擎对比 http://www.pureweber.com/article/myisam-vs-innodb/
mysql 配置详解： http://blog.linuxeye.com/379.html
mysql调优： http://www.aminglinux.com/bbs/thread-5758-1-1.html
同学分享的亲身mysql调优经历： http://www.apelearn.com/bbs/thread-11281-1-1.html
SQL语句教程 http://www.runoob.com/sql/sql-tutorial.html
什么是事务？事务的特性有哪些？ http://blog.csdn.net/yenange/article/details/7556094

根据binlog恢复指定时间段的数据 https://blog.csdn.net/lilongsy/article/details/74726002
mysql字符集调整 http://xjsunjie.blog.51cto.com/999372/1355013

技术分享图片

root 是MySQL的超级管理员用户和Linux系统的root管理员类似

同时也要区分这个root和系统的用户不是一个用户，当然也可以创建普通用户连接MySQL

默认root 的MySQL用户密码是空的，所以我们为了安全需要设置一个密码

先看MySQL有没有启动，如果没启动先启动起来

[[email protected] src]# ps aux |grep mysql

[[email protected] mysql]# /etc/init.d/mysqld start

Starting MySQL SUCCESS!

开始启动时候我报了个错

Starting MySQL. ERROR! The server quit without updating PID file (/data/mysql/linux-001.pid).

我就看配置文件和启动文件最终

[[email protected] mysql]# vi /etc/init.d/mysqld

mysqld_pid_file_path=/data/mysql/

定义后就可以正常启动了

[[email protected] mysql]# ls /usr/local/mysql/bin/mysql

/usr/local/mysql/bin/mysql

[[email protected] mysql]# echo $PATH

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin

要想让他加到环境变量

export PATH=/usr/local/mysql/bin:$PATH

[[email protected] mysql]# mysql -uroot

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

Your MySQL connection id is 1

Server version: 5.6.39 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>

给root用户设密码

[[email protected] mysql]# mysqladmin -uroot password ‘123456‘

Warning: Using a password on the command line interface can be insecure.

重启

[[email protected] mysql]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL... SUCCESS!

[[email protected] mysql]# mysql -uroot 不加密码阻止进入了

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

[[email protected] mysql]# mysql -uroot -p 加-p输入密码

Enter password:

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

Your MySQL connection id is 2

Server version: 5.6.39 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>

有的时候需要更改已知的mysql密码

[[email protected] mysql]# mysqladmin -uroot -p‘123456‘ password ‘Aa123456‘

Warning: Using a password on the command line interface can be insecure.

[[email protected] mysql]# mysql -uroot -p 要输入新的密码Aa123456

Enter password:

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

Your MySQL connection id is 4

Server version: 5.6.39 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.

在mysql的使用过程中也可能会碰到mysql密码被遗忘的情况

[[email protected] mysql]# vim /etc/my.cnf

[mysqld]

skip-grant-tables

[[email protected] mysql]# /etc/init.d/mysqld restart 重启

Shutting down MySQL.. SUCCESS!

Starting MySQL.. SUCCESS!

[[email protected] mysql]# mysql -uroot 不用密码也可以登录

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

Your MySQL connection id is 1

Server version: 5.6.39 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的用户密码存在mysql数据库的user表中

mysql> show databases;

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

| Database |

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

| information_schema |

| mysql |

| performance_schema |

| test |

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

4 rows in set (0.01 sec)

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 -A

Database changed

mysql> desc user;

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

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

| Host | char(60) | NO | PRI | | |

| User | char(16) | NO | PRI | | |

| Select_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Insert_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Update_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Delete_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Drop_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Reload_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Shutdown_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Process_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| File_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Grant_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| References_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Index_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_db_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Super_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_tmp_table_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Lock_tables_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Execute_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_slave_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_client_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_user_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Event_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Trigger_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_tablespace_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| max_questions | int(11) unsigned | NO | | 0 | |

| max_updates | int(11) unsigned | NO | | 0 | |

| max_connections | int(11) unsigned | NO | | 0 | |

| max_user_connections | int(11) unsigned | NO | | 0 | |

| password_expired | enum(‘N‘,‘Y‘) | NO | | N | |

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

43 rows in set (0.00 sec)

mysql> select user,password from user where user=‘root‘;

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

| user | password |

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

| root | *4A488726AE5A0B0F0DB967998EE12D87F25C9610 |

| root | |

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

4 rows in set (0.01 sec)

mysql> update user set password=password(‘123456‘) where user=‘root‘; //更新密码为123456

Query OK, 4 rows affected (0.00 sec)

Rows matched: 4 Changed: 4 Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.00 sec)

mysql> exit

Bye

//删除my.conf中的skip-grant

[[email protected] mysql]# vim /etc/my.cnf

[[email protected] mysql]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL.. SUCCESS!

[[email protected] mysql]# mysql -uroot

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

[[email protected] mysql]# mysql -uroot -p

Enter password:

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

Your MySQL connection id is 2

Server version: 5.6.39 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>

mysql -uroot -p123456

mysql -uroot -p123456 -h127.0.0.1 -P3306

mysql -uroot -p123456 -S/tmp/mysql.sock

mysql -uroot -p123456 -e “show databases”

mysql主要有4种连接方式

1.mysql -uroot -p123456

[[email protected] mysql]# mysql -uroot -p‘123456‘

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: 5.6.39 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> quit

Bye

2.mysql -uroot -p123456 -h127.0.0.1 -P3306

//ip和端口连接方式

[[email protected] mysql]# netstat -ntlup | grep :3306

tcp6 0 0 :::3306 :::* LISTEN 13870/mysqld

[[email protected] mysql]# mysql -uroot -p‘123456‘ -h 127.0.0.1 -P 3306

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 8

Server version: 5.6.39 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> quit

Bye

3.mysql -uroot -p123456 -S/tmp/mysql.sock

//socket方式，其实与第一种是一样的 [[email protected] mysql]# ps aux | grep mysql | grep socket

mysql 13870 0.1 44.6 1302936 450260 pts/1 Sl 14:36 0:08 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=mysql.err --pid-file=/data/mysql/mysql.pid --socket=/tmp/mysql.sock

[[email protected] mysql]# mysql -uroot -p‘123456‘ -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 9

Server version: 5.6.39 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> quit

Bye

4.mysql -uroot -p123456 -e sql_command

//这种方式可以直接在命令行上执行sql查询，可以用在bash脚本的编写中

[[email protected] mysql]# mysql -uroot -p‘123456‘ -e ‘select user,password from mysql.user‘

Warning: Using a password on the command line interface can be insecure.

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

| user | password |

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

| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| | |

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

查询库 show databases;

切换库 use mysql;

查看库里的表 show tables;

查看表里的字段 desc tb_name;

查看建表语句 show create table tb_nameG;

查看当前用户 select user();

查看当前使用的数据库 select databsase();

创建库 create database db1;

创建表 use db1; create table t1(`id` int(4), `name` char(40));

查看当前数据库版本 select version();

查看数据库状态 show status;

查看各参数 show variables; show variables like ‘max_connect%‘;

修改参数 set global max_connect_errors=1000;

查看队列 show processlist; show full processlist;

[[email protected] mysql]# mysql -uroot -p‘123456‘

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 11

Server version: 5.6.39 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> show databases;

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

| Database |

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

| information_schema |

| mysql |

| performance_schema |

| test |

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

4 rows in set (0.01 sec)

mysql> use mysql //切换库，切换库结尾可以不带;号

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

查看数据库的表

mysql> show tables;

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

| Tables_in_mysql |

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

| columns_priv |

| db |

| event |

| func |

| general_log |

| help_category |

| help_keyword |

| help_relation |

| help_topic |

| innodb_index_stats |

| innodb_table_stats |

| ndb_binlog_index |

| plugin |

| proc |

| procs_priv |

| proxies_priv |

| servers |

| slave_master_info |

| slave_relay_log_info |

| slave_worker_info |

| slow_log |

| tables_priv |

| time_zone |

| time_zone_leap_second |

| time_zone_name |

| time_zone_transition |

| time_zone_transition_type |

| user |

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

28 rows in set (0.00 sec)

查看表的结构

mysql> desc user;

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

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

| Host | char(60) | NO | PRI | | |

| User | char(16) | NO | PRI | | |

| Select_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Insert_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Update_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Delete_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Drop_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Reload_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Shutdown_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Process_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| File_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Grant_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| References_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Index_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_db_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Super_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_tmp_table_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Lock_tables_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Execute_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_slave_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Repl_client_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Show_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Alter_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_user_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Event_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Trigger_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| Create_tablespace_priv | enum(‘N‘,‘Y‘) | NO | | N | |

| max_questions | int(11) unsigned | NO | | 0 | |

| max_updates | int(11) unsigned | NO | | 0 | |

| max_connections | int(11) unsigned | NO | | 0 | |

| max_user_connections | int(11) unsigned | NO | | 0 | |

| password_expired | enum(‘N‘,‘Y‘) | NO | | N | |

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

43 rows in set (0.01 sec)

创建数据库

mysql> create database dbtest;

Query OK, 1 row affected (0.00 sec)

创建在数据库中创建表

//注意是反引号一定记得是反引号

mysql> create table tb1(`id` int(4),`name` char(40));

Query OK, 0 rows affected (0.03 sec)

查看建表语句

// G代表横向显示 //如需建表时设定字符集，可以在create table语句后加上‘ENGINE=InnoDB DEFAULT CHARSET=utf8’，utf-8替换为相应的字符集

mysql> show create table tb1G

*************************** 1. row ***************************

Table: tb1

Create Table: CREATE TABLE `tb1` (

`id` int(4) DEFAULT NULL,

`name` char(40) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=latin1

1 row in set (0.00 sec)

查看当前用户

mysql> select user();

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

| user() |

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

| [email protected] |

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

1 row in set (0.00 sec)

查看当前数据库

Database changed mysql> select database(); +------------+ | database() | +------------+ | mysql | +------------+ 1 row in set (0.01 sec)

查看数据库版本

mysql> select version(); +-----------+ | version() | +-----------+ | 5.6.36 | +-----------+ 1 row in set (0.00 sec)

查看数据库状态

mysql> show status;

查看数据库参数

mysql> show variablesG

查看具体的数据库参数

//%号和like结合使用，%是通配符

mysql> show variables like ‘max_connect%‘;

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

| Variable_name | Value |

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

| max_connect_errors | 100 |

| max_connections | 151 |

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

2 rows in set (0.00 sec)

临时设定参数

//退出后重启mysql服务，参数失效 mysql> quit Bye

[[email protected] mysql]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

[[email protected] mysql]# mysql -uroot -p‘123456‘

Warning: Using a password on the command line interface can be insecure.

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

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

mysql> show variables like ‘max_connect%‘;

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

| Variable_name | Value |

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

| max_connect_errors | 100 |

| max_connections | 151 |

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

2 rows in set (0.00 sec)

永久修改参数值

[email protected] mysql]# vim /etc/my.cnf

//在[mysqld]下添加相应的参数 max_connect_errors=1000

[[email protected] mysql]# /etc/init.d/mysqld restart

[[email protected] mysql]# mysql -uroot -p‘123456‘

mysql> show variables like ‘max_connect%‘;

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

| Variable_name | Value |

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

| max_connect_errors | 1000 |

| max_connections | 151 |

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

2 rows in set (0.00 sec)

grant all on *.* to ‘user1‘ identified by ‘passwd‘;

grant SELECT,UPDATE,INSERT on db1.* to ‘user2‘@‘192.168.133.1‘ identified by ‘passwd‘;

grant all on db1.* to ‘user3‘@‘%‘ identified by ‘passwd‘;

show grants;

show grants for [email protected];

mysql安装完以后默认只有一个root管理用户，最高权限。不利于安全管理。需要根据需要创建不同用户。

//创建用户并授予全部权限

[[email protected] mysql]# mysql -uroot -p‘123456‘

mysql> grant all on *.* to ‘user01‘ identified by ‘123456‘;

Query OK, 0 rows affected (0.00 sec)

[[email protected] mysql]# mysql -uuser01 -p

Enter password:

ERROR 1045 (28000): Access denied for user ‘user01‘@‘localhost‘ (using password: YES)

//系统中存在空帐户导致，删除多余空帐户

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 -A

Database changed

mysql> select User,Password from user;

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

| User | Password |

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

| root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

| | |

| user1 | *59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0 |

| user2 | *59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0 |

| user3 | *59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0 |

| user01 | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |

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

10 rows in set (0.00 sec)

mysql> delete from user where user=‘‘;

Query OK, 2 rows affected (0.00 sec)

//该句一定要执行 mysql> FLUSH PRIVILEGES; mysql> exit

[[email protected] mysql]# mysql -u user01 -p

Enter password:

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

Your MySQL connection id is 15

Server version: 5.6.39 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.

//授予部分权限 //授予user08用户mysql数据库，user表查询，更新和插入的权限

[[email protected] mysql]# mysql -uroot -p‘123456‘

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 16

Server version: 5.6.39 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> grant SELECT,UPDATE,INSERT on mysql.user to ‘user08‘ identified by ‘123456‘;

Query OK, 0 rows affected (0.01 sec)

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 -A

Database changed

mysql> show database;

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 ‘database‘ at line 1

mysql> show databases;

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

| Database |

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

| information_schema |

| dbtest |

| mysql |

| performance_schema |

| test |

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

5 rows in set (0.00 sec)

//因为对user表有权限，其他表都看不到

mysql> show tables;

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

| Tables_in_mysql |

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

| columns_priv |

| db |

| event |

| func |

| general_log |

| help_category |

| help_keyword |

| help_relation |

| help_topic |

| innodb_index_stats |

| innodb_table_stats |

| ndb_binlog_index |

| plugin |

| proc |

| procs_priv |

| proxies_priv |

| servers |

| slave_master_info |

| slave_relay_log_info |

| slave_worker_info |

| slow_log |

| tables_priv |

| tb1 |

| time_zone |

| time_zone_leap_second |

| time_zone_name |

| time_zone_transition |

| time_zone_transition_type |

| user |

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

29 rows in set (0.00 sec)

//限制可以从哪个ip登录访问 //@后的部分可以指定可以访问的来源，%表示任意地址 //注意@前后的引号

mysql> grant all on *.* to ‘user09‘@‘127.0.0.1‘ identified by ‘123456‘;

Query OK, 0 rows affected (0.00 sec)

mysql> exit

Bye

[[email protected] mysql]# mysql -uuser09 -p -h127.0.0.1

Enter password:

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

Your MySQL connection id is 17

Server version: 5.6.39 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> quit

Bye

[[email protected] mysql]# mysql -uuser09 -p -hlocalhost

Enter password:

ERROR 1045 (28000): Access denied for user ‘user09‘@‘localhost‘ (using password: YES)

[[email protected] mysql]# mysql -uuser09 -h192.168.76.135

ERROR 1045 (28000): Access denied for user ‘user09‘@‘192.168.76.135‘ (using password: NO)

[[email protected] mysql]# mysql -uroot -p‘123456‘

mysql> show grants for [email protected];

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

| Grants for [email protected] |

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

| GRANT ALL PRIVILEGES ON *.* TO ‘user09‘@‘127.0.0.1‘ IDENTIFIED BY PASSWORD ‘*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9‘ |

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

1 row in set (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON *.* TO ‘user09‘@‘%‘ IDENTIFIED BY PASSWORD ‘*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9‘;

Query OK, 0 rows affected (0.00 sec)

mysql>

[[email protected] mysql]# mysql -uuser09 -p123456 -h127.0.0.1

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 22

Server version: 5.6.39 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>

[[email protected] mysql]# mysql -uuser09 -p123456 -hlocalhost;

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 23

Server version: 5.6.39 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>

[[email protected] mysql]# mysql -uuser09 -p123456 -h192.168.76.135

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 24

Server version: 5.6.39 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> show grants;

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

| Grants for [email protected]% |

select count(*) from mysql.user;

select * from mysql.db;

select db from mysql.db;

select db,user from mysql.db;

select * from mysql.db where host like ‘192.168.%‘;

insert into db1.t1 values (1, ‘abc‘);

update db1.t1 set name=‘aaa‘ where id=1;

truncate table db1.t1;

drop table db1.t1;

drop database db1;

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