MongoDB与mysql的对比

1、与Mql对照

MySQL	MongoDB	说明
mysqld	mongod	服务器守护进程
mysql	mongo	客户端工具
mysqldump	mongodump	逻辑备份工具
mysql	mongorestore	逻辑恢复工具
	db.repairDatabase()	修复数据库
mysqldump	mongoexport	数据导出工具
source	mongoimport	数据导入工具
grant * privileges on *.* to …	Db.addUser() Db.auth()	新建用户并权限
show databases	show dbs	显示库列表
Show tables	Show collections	显示表列表
Show slave status	Rs.status	查询主从状态
Create table users(a int, b int)	db.createCollection("mycoll", {capped:true, size:100000}) 另：可隐式创建表。	创建表
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