python查询mangodb

from bson.objectid import ObjectId

import pymongo

#查询代码

#连接本机mongodb

conn=pymongo.Connection()

#指定数据库

db = conn.books

#指定collection

collection = db.book

#大于

collection.find({'_id':{'$gt':ObjectId('51f6126139ecbb1db4a75667')}})

#大于等于

collection.find({'_id':{'$gte':ObjectId('51f6126139ecbb1db4a75667')}})

#小于

collection.find({'_id':{'$lt':ObjectId('51f6126139ecbb1db4a75667')}})

#小于等于

collection.find({'_id':{'$lte':ObjectId('51f6126139ecbb1db4a75667')}})