MySQL与MongoDB的操作对比，以及区别

作用

MySQL

MongoDB

服务器守护进程

mysqld

mongod

客户端工具

mysql

mongo

逻辑备份工具

mysqldump

mongodump

逻辑还原工具

mysql

mongorestore

数据导出工具

mysqldump

mongoexport

数据导入工具

source

mongoimport

新建用户并授权

grant all on *.*
to username@‘localhost‘
 identified by ‘passwd‘;

db.addUser("user","psw")
db.auth("user","psw")

显示库列表

show databases;

show dbs

进去库

use dbname;

use dbname

显示表列表

show tables;

show collections

查询主从状态

show slave status;

rs.status

创建库

create database name;

无需单独创建，直接use进去

创建表

create table tname(id int);

无需单独创建，直接插入数据

删除表

drop table tname;

db.tname.drop()

删除库

drop database dbname;

首先进去该库，db.dropDatabase()

插入记录

insert into tname(id) value(2);

db.tname.insert({id:2})

删除记录

delete from tname where id=2;

db.tname.remove({id:2})

修改/更新记录

update tname set id=3
where id=2;

db.tname.update({id:2},
{$set:{id:3}},false,true)

查询所有记录

select * from tname;

db.tname.find()

查询所有列

select id from tname;

db.tname.find({},{id:1})

条件查询

select * from tname where id=2;

db.tname.find({id:2})

条件查询

select * from tname where id < 2;

db.tname.find({id:{$lt:2}})

条件查询

select * from tname where id >=2;

db.tname.find({id:{$gte:2}})

条件查询

select * from tname where id=2
and name=‘steve‘;

db.tname.find({id:2,
name:‘steve‘})

条件查询

select * from tname where id=2
or name=‘steve‘;

db.tname.find($or:[{id:2},
{name:‘steve‘}])

条件查询

select * from tname limit 1;

db.tname.findOne()

模糊查询

select * from tname where name
like "%ste%";

db.tname.find({name:/ste/})

模糊查询

select * from tname where name
like "ste%";

db.tname.find({name:/^ste/})

获取表记录数

select count(id) from tname;

db.tname.count()

获取有条件
的记录数

select count(id) from tname
where id=2;

db.tname.find({id:2}).count()

查询时去掉
重复值

select distinct(last_name)
from tname;

db.tname.distinct(‘last_name‘)

正排序查询

select *from tname order by id;

db.tname.find().sort({id:1})

逆排序查询

select *from tname
order by id desc;

db.tname.find().sort({id:-1})

取存储路径

explain select * from tname
where id=3;

db.tname.find({id=3}).explain()