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<转>MongoDB 查询语句

mongodb语句 
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---查询语句---
 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/})
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