Python Mongo操作

# -*- coding: utf-8 -*-
'''

Python Mongo操作Demo
Done:
'''
from pymongo import MongoClient

conn = None
topics = None
users=None
def process():
 connection=MongoClient('localhost', 27017)
 global conn
 conn = connection;
 #列出server_info信息
 #print conn.server_info()

 #列出全部数据库
 databases = conn.database_names()
 print databases
 topics = conn.node.topics
 users=conn.node.users
 ret=users.find({'loginname':'dingxiaoyuehao'})
 if ret and ret.count() > 0:
 print "yes"
 else:
 print "no"
 #删除库和表
 #dropTable()
 #添加数据库lifeba及表(collections)users
 #createTable()
 #插入数据
 #insertDatas()
 #更新数据
 #updateData()
 #查询数据
 #queryData()
 #删除数据
 #deleteData()

 #释放连接
 #dbconn.close()

def insertDatas():
 datas=[{"name":"steven1","realname":"测试1","age":25},
 {"name":"steven2","realname":"测试2","age":26},
 {"name":"steven1","realname":"测试3","age":23}]
 topics.insert(datas)

def updateData():
 '''只修改最后一条匹配到的数据
 第3个参数设置为True,没找到该数据就添加一条
 第4个参数设置为True,有多条记录就不更新
 '''
 topics.update({'name':'steven1'},{'$set':{'realname':'测试1修改'}}, False,False)

def deleteData():
 topics.remove({'name':'steven1'})

def queryData():
 #查询全部数据
 rows = topics.find()
 printResult(rows)
 #查询一个数据
 print topics.find_one()
 #带条件查询
 printResult(topics.find({'name':'steven2'}))
 printResult(topics.find({'name':{'$gt':25}}))

def createTable():
 '''创建库和表'''
 global topics
 topics = conn.lifeba.topics

def dropTable():
 '''删除表'''
 global conn
 conn.drop_database("lifeba")

def printResult(rows):
 for row in rows:
 for key in row.keys():#遍历字典
 print row[key].encode('gb2312'), #加, 不换行打印
 print ''

if __name__ == '__main__':
 process()