MongoDB命令与SQL语法对比

SQL

MongoDB

说明

Create INDEX idxname ON users(name)

db.users.ensureIndex({name:1})

创建索引

Create INDEX idxname ON users(name,ts DESC)

db.users.ensureIndex({name:1,ts:-1})

创建索引

Insert into users values(1, 1)

db.users.insert({a:1, b:1})

插入记录

Select a, b from users

db.users.find({},{a:1, b:1})

查询表

Select * from users

db.users.find()

查询表

Select * from users where age=33

db.users.find({age:33})

条件查询

Select a, b from users where age=33

db.users.find({age:33},{a:1, b:1})

条件查询

select * from users where age<33

db.users.find({'age':{$lt:33}})

条件查询

select * from users where age>33 and age<=40

db.users.find({'age':{$gt:33,$lte:40}})

条件查询

select * from users where a=1 and b='q'

db.users.find({a:1,b:'q'})

条件查询

select * from users where a=1 or b=2

db.users.find( { $or : [ { a : 1 } , { b : 2 } ] } )

条件查询

select * from users limit 1

db.users.findOne()

条件查询

select * from users where name like "%Joe%"

db.users.find({name:/Joe/})

模糊查询

select * from users where name like "Joe%"

db.users.find({name:/^Joe/})

模糊查询

select count(1) from users

Db.users.count()

获取表记录数

select count(1) from users where age>30

db.users.find({age: {'$gt': 30}}).count()

获取表记录数

select DISTINCT last_name from users

db.users.distinct('last_name')

去掉重复值

select * from users ORDER BY name

db.users.find().sort({name:-1})

排序

select * from users ORDER BY name DESC

db.users.find().sort({name:-1})

排序

EXPLAIN select * from users where z=3

db.users.find({z:3}).explain()

获取存储路径

update users set a=1 where b='q'

db.users.update({b:'q'}, {$set:{a:1}}, false, true)

更新记录

update users set a=a+2 where b='q'

db.users.update({b:'q'}, {$inc:{a:2}}, false, true)

更新记录

delete from users where z="abc"

db.users.remove({z:'abc'})

删除记录

db. users.remove()

删除所有的记录

drop database IF EXISTS test;

use test

db.dropDatabase()

删除数据库

drop table IF EXISTS test;

db.mytable.drop()

删除表/collection

db.addUser(‘test’, ’test’)

添加用户

readOnly-->false

db.addUser(‘test’, ’test’, true)

添加用户

readOnly-->true

db.addUser("test","test222")

更改密码

db.system.users.remove({user:"test"})

或者db.removeUser('test')

删除用户

use admin

超级用户

db.auth(‘test’, ‘test’)

用户授权

db.system.users.find()

查看用户列表

show users

查看所有用户

db.printCollectionStats()

查看各collection的状态

db.printReplicationInfo()

查看主从复制状态

show profile

查看profiling

db.copyDatabase('mail_addr','mail_addr_tmp')

拷贝数据库

db.users.dataSize()

查看collection数据的大小

db. users.totalIndexSize()

查询索引的大小