python连接mongodb数据库操作数据示例

作者： wyh草样

出处：https://www.cnblogs.com/wyh0923/p/14047466.html

1、数据库配置类 MongoDBConn.py

#encoding=utf-8
'''

Mongo Conn连接类
'''

import pymongo

class DBConn:
  conn = None
  servers = "mongodb://localhost:27017"

  def connect(self):
    self.conn = pymongo.Connection(self.servers)

  def close(self):
    return self.conn.disconnect()

  def getConn(self):
    return self.conn

2、ngoDemo.py 类

#encoding=utf-8
'''

Mongo操作Demo
Done:
'''
import MongoDBConn

dbconn = MongoDBConn.DBConn()
conn = None
lifeba_users = None

def process():
  #建立连接
  dbconn.connect()
  global conn
  conn = dbconn.getConn()

  #列出server_info信息
  print conn.server_info()

  #列出全部数据库
  databases = conn.database_names()
  print databases

  #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}]
  lifeba_users.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
  '''
  lifeba_users.update({'name':'steven1'},{'$set':{'realname':'测试1修改'}}, False,False)

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

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

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

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], #加, 不换行打印
    print ''

if __name__ == '__main__':
  process()

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