数据库操作相关（sql语句-命令行）

创建数据库：
create database books;
创建用户：
mysql> grant select,insert,delete,uptate

-> on books.*

-> to dada identified by 'yujianqi2011';

使用数据库：

use dbname;
use dada;

新建数据库表
create table tablename(columns);
create table demo(
userid int unsigned not null auto_increment primary key,
username char(50) not null,
password char(20) not null,
age int not null,
city char(20) not null
);

显示数据库表
show tables;

在数据库中插入数据
insert into demo values(NULL,"dada","yujianqi2011",27,"beijing");
insert into demo values(NULL,"xiaoyin","yujianqi2011",26,"shanghai");

查询数据
select name, city from customers where name="dada";

更新数据
update customers
set address = "北京市海淀区";

删除数据
delete from dada where name = "dada";

表的删除
DROP TABLE table;

数据删除
DROP DATABASE database;