详解python之PyMongo的使用总结

import pymongo client = pymongo.MongoClient('localhost', 27017)

import pymongo client = MongoClient('mongodb://localhost:27017/')

db = client.mydb #或者db = client['mydb']

collection = db.my_collection #或者collection = db['my_collection']

db.collection_names()

collection.insert({"key1":"value1","key2","value2"})

collection.remove()

collection.remove({"key1":"value1"})

collection.update({"key1": "value1"}, {"$set": {"key2": "value2", "key3": "value3"}})

collection.find_one() collection.find_one({"key1":"value1"})

collection.find() collection.find({"key1":"value1"})

for item in collection.find():     print item

print collection.find().count()

collection.find().sort("key1") # 默认为升序 collection.find().sort("key1", pymongo.ASCENDING) # 升序 collection.find().sort("key1", pymongo.DESCENDING) # 降序

collection.find().sort([("key1", pymongo.ASCENDING), ("key2", pymongo.DESCENDING)])

#!/usr/bin/env python#coding:utf-8# Author:  --<qingfengkuyu># Purpose: MongoDB的使用# Created: 2014/4/14#32位的版本最多只能存储2.5GB的数据（NoSQLFan：最大文件尺寸为2G，生产环境推荐64位） import pymongoimport datetimeimport random #创建连接conn = pymongo.Connection('10.11.1.70',27017)#连接数据库db = conn.study#db = conn['study'] #打印所有聚集名称，连接聚集print u'所有聚集:',db.collection_names()posts = db.post#posts = db['post']print posts #插入记录new_post = {"AccountID":22,"UserName":"libing",'date':datetime.datetime.now()}new_posts = [{"AccountID":22,"UserName":"liuw",'date':datetime.datetime.now()},       {"AccountID":23,"UserName":"urling",'date':datetime.datetime.now()}]#每条记录插入时间都不一样 posts.insert(new_post)#posts.insert(new_posts)#批量插入多条数据 #删除记录print u'删除指定记录:',posts.find_one({"AccountID":22,"UserName":"libing"})posts.remove({"AccountID":22,"UserName":"libing"}) #修改聚集内的记录posts.update({"UserName":"urling"},{"$set":{'AccountID':random.randint(20,50)}}) #查询记录，统计记录数量print u'记录总计为：',posts.count(),posts.find().count()print u'查询单条记录:',posts.find_one()print posts.find_one({"UserName":"liuw"}) #查询所有记录print u'查询多条记录:'#for item in posts.find():#查询全部记录#for item in posts.find({"UserName":"urling"}):#查询指定记录#for item in posts.find().sort("UserName"):#查询结果根据UserName排序，默认为升序#for item in posts.find().sort("UserName",pymongo.ASCENDING):#查询结果根据UserName排序，ASCENDING为升序,DESCENDING为降序for item in posts.find().sort([("UserName",pymongo.ASCENDING),('date',pymongo.DESCENDING)]):#查询结果根据多列排序  print item #查看查询语句的性能#posts.create_index([("UserName", pymongo.ASCENDING), ("date", pymongo.DESCENDING)])#加索引print posts.find().sort([("UserName",pymongo.ASCENDING),('date',pymongo.DESCENDING)]).explain()["cursor"]#未加索引用BasicCursor查询记录print posts.find().sort([("UserName",pymongo.ASCENDING),('date',pymongo.DESCENDING)]).explain()["nscanned"]#查询语句执行时查询的记录数</qingfengkuyu>