# chkconfig --list    列出所有系统服务
# chkconfig --list | grep on   列出所有启动的系统服务
# chkconfig --list mysqld 
# whereis mysql 查看文件安装路径
# which mysql   查询运行文件所在路径(文件夹地址)
usr/bin/mysql 是指：mysql的运行路径
var/lib/mysql 是指：mysql数据库文件的存放路径
usr/lib/mysql 是指：mysql的安装路径

# vi /etc/profile
# export MYSQL_HOME=/usr/local/mysql
# export PATH=$PATH:$MYSQL_HOME/bin

# service mysqld start  启动MySQL
# service mysqld restart 重启MySQL
# service mysqld stop   停止MySQL

# -u root -p /mysql -h localhost -u root -p DatabaseName;  进入MySQL
 MySQL> show databases;      列出数据库
 MySQL> create database XXX;   创建数据库XXX
 MySQL> use databaseName;     使用数据库databaseName
 MySQL> show tables;       列出表单
MySQL> create table mytablename (ID int auto_increment not null primary key,usename varchar(20),password varchar(64),sex varchar(10),address varchar(20)); 创建表单
MySQL> drop table mytablename ;         删除表单
MySQL> drop database databasename;       删除数据库

MySQL> insert into mytablename values('','zhangsan','123456','fomale','guiyanag'); 插入
MySQL> select * from mytablename ;         查找验证结果
MySQL> select * from mytablename where ID = '1'; 精准查找
MySQL> update mytablename set address = 'shanghai' where username = 'zhangsan'; 修改zhangsan的address为shanghai
MySQL> delete from mytablename where ID = '1';   删除记录

grant select On database.* to username@localhost identity by 'password'

MySQL> grant select,insert update,delete on *.* to user_1@"%" identity by "123456";

MySQL> grant select,insert update,delete on *.* to user_2@localhost identity by "123456";

MySQL> -u user_1 -p -h IP地址;