mongodb常用查询

mongo	sql	说明
db.users.find()	select * from users	从user表中查询所有数据
db.users.find({“username” : “joe”, “age” : 27})	select * from users where “username” = “joe” and age = 27	查找username = joe且age = 27的人
db.users.find({}, {“username” : 1, “email” : 1})	select username, email from users	查找username,email这2个子项
db.users.find({“age” : {“$gt” : 18}})	select * from users where age >18	查找age > 18的会员
db.users.find({“age” : {“$gte” : 18}})	select * from users where age >=18	查找age >= 18的人
db.users.find({“age” : {“$lt” : 18}})	select * from users where age <18	查找age < 18的人
db.users.find({“age” : {“$lte” : 18}})	select * from users where age <=18	查找age <= 18的人
db.users.find({“username” : {“$ne” : “joe”}})	select * from users where username <> “joe”	查找 username != joe的会员
db.users.find({“ticket_no” : {“$in” : [725, 542, 390]}})	select * from users where ticket_no in (725, 542, 390)	符合tickt_no在此范围的结果
db.users.find({“ticket_no” : {“$nin” : [725, 542, 390]}})	select * from users where ticket_no not in (725, 542, 390)	符合tickt_no不在此范围的结果
db.users.find({“name” : /joey^/})	select * from users where name like “joey%”	查找前4个字符为joey的人