【文档操作】mongoDB文档操作

MongoDB语法	MySql语法
db.test.find()	select * from test
db.test.find({'name':'foobar'})	select * from test where name='foobar'
db.test.find({'ID':10}).count()	select count(*) from test where ID=10
db.test.find().skip(10).limit(20)	select * from test limit 10,20
db.test.find({'ID':{$in:[25,35,45]}})	select * from test where ID in (25,35,45)
db.test.find().sort({'ID':-1})	select * from test order by IDdesc
db.test.distinct('name',{'ID':{$lt:20}})	select distinct(name) from testwhere ID<20
db.test.group({key:{'name':true},cond:{'name':'foo'},reduce:function(obj,prev){prev.msum+=obj.marks;},initial:{msum:0}})	select name,sum(marks) from testgroup by name
db.test.find('this.ID<20',{name:1})	select name from test whereID<20
db.test.remove({})	delete * from test
db.test.remove({'age':20})	delete test where age=20
db.test.remove({'age':{$lt:20}})	delete test where age<20
db.test.remove({'age':{$lte:20}})	delete test where age<=20
db.test.remove({'age':{$gt:20}})	delete test where age>20
db.test.remove({'age':{$gte:20}})	delete test where age>=20
db.test.remove({'age':{$ne:20}})	delete test where age!=20
db.test.update({'name':'foobar'},{$set:{'age':36}})	update test set age=36 where name='foobar'
db.test.update({'name':'foobar'},{$inc:{'age':3}})	update test set age=age+3 where name='foobar'
db.test.insert({'name':'foobar','age': 34})	insert into test(name, age) values('foobar',34)