mongodb和mysql数据定义与数据操纵

1. 创建数据库

create database ssm; //mysql
use analysis //mongodb

2. 切换数据库

use ssm; //mysql
use analysis //mongodb

3. 删除数据库

drop database ssm; //mysql
db.dropDatabase() //mongodb

4. 数据定义与数据操纵

//mysql
create table `teacher`(
   `id` int,
   `name` varchar(20),
   `salary` decimal(7,2),
   `birthday` date,
   `timestamp` timestamp DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   primary key (`id`)
);
alter table `teacher` drop `birthday`;
alter table `teacher` add  `birthday` date;
drop table `teacher`;
insert into `teacher` (`id`,`name`,`salary`,`birthday`) values (1,"大明",50000.00,"1997-01-01");
update `teacher` set `salary`=5000 where `name`="大明";                    
delete from `teacher` where `name`="大明";

//mongo
db.createCollection("student")
db.student.drop()
db.student.insert({
    name: '小明', 
    birthday:"2007-01-01",
    scholarship: true,
    success:{"math":80,"data analysis":90},
    tags: ['男', '2016 级', '清华'],
    timestamp:parseInt(new Date().getTime()/1000)})
db.student.update({name:'小明'},{$set:{name:'小元'}})
db.student.remove({name:'小元'})