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;