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

import pymongo

import re

from pymongo import MongoClient

#创建连接

client = MongoClient('10.20.4.79', 27017)

db_name = 'ta'

db = client[db_name]

假设mongodb数据库中school 集合中有一些数据记录

{ "_id" : 1, "zipcode" : "63109", "students" : { "comments" : "python abc" } }

{ "_id" : 2, "zipcode" : "63110", "students" : { "comments" : "python abc" } }

{ "_id" : 3, "zipcode" : "63109", "students" : { "comments" : "python abc" } }

{ "_id" : 4, "zipcode" : "63109", "students" : { "comments" : "python abc" } }

{ "_id" : 5, "zipcode" : "63109", "students" : { "comments" : "python abc" } }

{ "_id" : 7, "zipcode" : "63109", "students" : { "comments" : "python abc" }, "school" : "102 python abc" }

{ "_id" : 8, "zipcode" : "63109", "students" : { "comments" : "python abc" }, "school" : "100 python abc xyz" }

{ "_id" : 9, "zipcode" : "100", "students" : { "name" : "mike", "age" : 12, "comments" : "python" } }

{ "_id" : 10, "zipcode" : "100", "students" : { "name" : "Marry", "age" : 42, "comments" : "this is a python" } }

{ "_id" : 11, "zipcode" : "100", "students" : { "name" : "joe", "age" : 92, "comments" : "this is a python program" } }

{ "_id" : 12, "zipcode" : "100", "students" : { "name" : "joedd", "age" : 34, "comments" : "python is a script language" } }

现在要对students中comments的数据进行模糊查询, python中模糊查询要借助正则表达式：

1、查询comments中包含"abc"的记录：

for u in db.school.find({'students.comments':re.compile('abc')}):

print u

结果如下：

{u'students': {u'comments': u'python abc'}, u'_id': 1.0, u'zipcode': u'63109'}

{u'students': {u'comments': u'python abc'}, u'_id': 2.0, u'zipcode': u'63110'}

{u'students': {u'comments': u'python abc'}, u'_id': 3.0, u'zipcode': u'63109'}

{u'students': {u'comments': u'python abc'}, u'_id': 4.0, u'zipcode': u'63109'}

{u'students': {u'comments': u'python abc'}, u'_id': 5.0, u'zipcode': u'63109'}

{u'students': {u'comments': u'python abc'}, u'school': u'102 python abc', u'_id': 7.0, u'zipcode': u'63109'}

{u'students': {u'comments': u'python abc'}, u'school': u'100 python abc xyz', u'_id': 8.0, u'zipcode': u'63109'}

2、查询comments中包含"this is"的记录：

for u in db.school.find({'students.comments':re.compile('this is')}):

print u

结果如下：

{u'students': {u'age': 42.0, u'name': u'Marry', u'comments': u'this is a python'}, u'_id': 10.0, u'zipcode': u'100'}

{u'students': {u'age': 92.0, u'name': u'joe', u'comments': u'this is a python program'}, u'_id': 11.0, u'zipcode': u'100'}

由此可见，模糊查询要用到re模块，查询条件利用re.compile()函数