日期:2014-05-16 浏览次数:21431 次
1.CREATE USER 语法: CREATE USER 'username'@'host' IDENTIFIED BY 'password'; 例子: CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456'; CREATE USER 'pig'@'192.168.1.101_' IDENDIFIED BY '123456'; CREATE USER 'pig'@'%' IDENTIFIED BY '123456'; CREATE USER 'pig'@'%' IDENTIFIED BY ''; CREATE USER 'pig'@'%'; 实例1: mysql> create user jss; 这样创建的用户,可以从任意安装了mysql客户端,并能够访问目标服务器的机器上创建连接,无须密码.例如,从ip:10.0.0.99的客户端执行连接: mysql -ujss -h 172.16.1.110 查看该用户: mysql> select user,host,password from user where user='jss'; SELECT USER(); //显示当前用户 实例2: mysql> create user jss_ps identified by 'jss'; 用户连接时,必须指定密码,那就可以在创建用户时,通过指定identified by子句来设定密码 用密码登陆: mysql -ujss_ps -p -h 172.16.1.110 如果希望指定的用户只能从某台指定的域(domain)或主机访问,可以在创建用户时指定host,例如,指定用户只能从10.0.0.99访问 mysql> create user jss_ip@10.0.0.99 identified by password '123456'; 2.使用GRANT语句 语法:mysql> grant 权限1,权限2,...权限n on 数据库名称.表名称 to 用户名@用户地址 identified by '连接口令'; 权限1,权限2,...权限n代表 select,insert,update,delete,create,drop,index,alter,grant,references,reload,shutdown,process,file等14个权限 实例: mysql>grant select,insert,update,delete,create,drop on vtdc.employee to joe@10.163.225.87 identified by '123'; 给来自10.163.225.87的用户joe分配可对数据库vtdc的employee表进行select,insert,update,delete,create,drop等操作的权限,并设定口令为123。 mysql>grant all privileges on vtdc.* to joe@10.163.225.87 identified by '123'; 给来自10.163.225.87的用户joe分配可对数据库vtdc所有表进行所有操作的权限,并设定口令为123。 mysql>grant all privileges on *.* to joe@10.163.225.87 identified by '123'; 给来自10.163.225.87的用户joe分配可对所有数据库的所有表进行所有操作的权限,并设定口令为123。 mysql>grant all privileges on *.* to joe@localhost identified by '123'; 给本机用户joe分配可对所有数据库的所有表进行所有操作的权限,并设定口令为123。 3.直接向mysql.user表插入记录: mysql> insert into user (host,user,password) values ('%','jss_insert',password('jss')); mysql>flush privileges; //刷新系统权限表 4.修改mysql用户密码方式: a.使用mysqladmin语法:mysqladmin -u 用户名 -p password 新密码 例如:mysqladmin -u root -p password 456; b.直接修改user表的用户口令: 语法:update mysql.user set password=password('新密码') where User="phplamp" and Host="localhost"; 实例:update user set password=password('54netseek') where user='root'; flush privileges; c.使用SET PASSWORD语句修改密码:语法: SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword'); 如果是当前登陆用户用SET PASSWORD = PASSWORD("newpassword"); 实例: set password for root@localhost=password(''); SET PASSWORD FOR name=PASSWORD('new password'); SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456"); 5. 删除用户和撤销权限: a.取消一个账户和其权限 Drop USER user; drop user username@'%' drop user username@localhost b.取消授权用户: 语法:REVOKE privilege ON databasename.tablename FROM 'username'@'host'; 例子: REVOKE SELECT ON *.* FROM 'pig'@'%'; REVOKE SELECT ON test.user FROM 'pig'@'%'; revoke all on *.* from sss@localhost ; revoke all on user.* from 'admin'@'%'; SHOW GRANTS FOR 'pig'@'%'; //查看授权 c.删除用户: 语法: Delete from user where user = "user_name" and host = "host_name" ; 例子:delete from user where user='sss' and host='localhost'; 二、数据库表 1.查看所有数据库: 数据库目录:/usr/local/mysql/data mysql> SHOW DATABASES; //显示数据库 mysql> USE abccs //进入数据库 mysql> SHOW TABLES; //显示表 mysql> DESCRIBE mytable; //显示表结构 mysql> CREATE DATABASE abccs; //创建一个数据库 mysql> CREATE TABLE mytable (name VARCHAR(20), sex CHAR(1), birth DATE, birthaddr VARCHAR(20)); //创建表 mysql> insert into mytable values (‘abccs’,‘f’,‘1977-07-07’,‘china’); //插入表数据 使用文本方