使用mysql
1、登录，可以用密码登录，也可以不用密码登录。命令格式“mysql –u 用户名 –p 密码”
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[root@localhost src]# mysql -u root –p //有密码登录
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 3
[root@localhost src]# mysql -u root //无密码登录
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2、退出，命令“quit”
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[root@localhost bin]# quit
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3、创建数据库，命令“create database 数据库名称;”，注意这个命令后面有分号
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mysql> create database test1;
Query OK, 1 row affected (0.00 sec)
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4、查看数据库，命令“show databases;”
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mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| test |
| test1 |
+--------------------+
4 rows in set (0.00 sec)
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5、删除数据库，命令“drop database 数据库名称;”
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mysql> drop database test1;
Query OK, 0 rows affected (0.01 sec)
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6、设置权限
mysql允许给某个特定的用户赋予指定的权利，而且可以指定在某台机器上使用。Mysql的权限如下
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权限
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数据库
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Table
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Column
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说明
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all privileges
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√
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所有权利
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alter
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√
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√
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增减、删除、修改列
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create
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√
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√
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创建数据库、表
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delete
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√
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√
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删除行
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drop
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√
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√
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删除表、数据库
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file
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√
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操作文件
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index
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√
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√
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索引
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insert
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√
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√
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√
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插入
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process
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√
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查看线程、连接
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reference
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√
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创建外键
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reload
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√
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重新加载，拥有此权限可以刷新表
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select
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√
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√
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√
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选择
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shutdown
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√
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关闭
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update
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√
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√
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√
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更新
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usage
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√
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无权限，只能连接
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1）授权用户权限，命令格式“grant 权限on 数据库文件to 用户名@ip identified by ‘密码’;”。在使用grant的时候，如果用户不存在，那么久创建用户。
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//给david在本机授权插入功能，密码123456，只能对test01操作
mysql> grant insert on test01.* to david@localhost identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql>
//给david所有权限，在所有的主机都可以操作，而且可以操作任意数据库
mysql> grant all privileges on *.* to david@'%' identified by '123456';
Query OK, 0 rows affected (0.00 sec)
mysql>
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2）查看当前数据库所有授权情况，命令“select host，user from mysql.user”
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mysql> select host,user from mysql.user;
+-----------------------+-------+
| host | user |
+-----------------------+-------+
| % | david |
| 127.0.0.1 | root |
| localhost | |
| localhost | david |
| localhost | root |
| localhost.localdomain | |
| localhost.localdomain | root |
+-----------------------+-------+
7 rows in set (0.00 sec)
mysql>
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3）查看当前登录用户的权利，命令“show grants”
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mysql> show grants;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*1256939B1977AFF6C3D114C5594EE354EF363A8B' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql>
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4）查看某个用户在某台机器的权限，命令“show grants for user@ip”
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mysql> show grants for david@localhost;
+--------------------------------------------------------------------------------------------------------------+
| Grants for david@localhost |
+--------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'david'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
| GRANT INSERT ON `test01`.* TO 'david'@'localhost' |
+--------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql>
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5）删除用户的权限，命令“revoke 权限on 数据库文件 from user@ip”
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mysql> revoke all privileges on *.* from david@'%';
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for david@localhost; //删除之后查看一下
+--------------------------------------------------------------------------------------------------------------+
| Grants for david@localhost |
+--------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'david'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+--------------------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql>
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6）删除用户，命令“delete from user where user=‘username’”
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mysql> use mysql; //首先要调用这个命令
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> delete from user where user='david'; //删除用户
Query OK, 2 rows affected (0.00 sec)
mysql> select host,user from mysql.user; //查看用户
+-----------------------+------+
| host | user |
+-----------------------+------+
| 127.0.0.1 | root |
| localhost | |
| localhost | root |
| localhost.localdomain | |
| localhost.localdomain | root |
+-----------------------+------+
5 rows in set (0.00 sec)
mysql>
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