python利用pymongo模块操作mongodb

	
	#//pip
	pip install pymongo

	#//easy_install
	easy_install pymongo

	#//源码
	wget https://pypi.python.org/packages/source/p/pymongo/pymongo-2.7.tar.gz
	tar zxvf pymongo-2.7.tar.gz
	cd pymongo-2.7
	python setup.py install

	#!/usr/bin/python
	import pymongo
	import time
	conn = pymongo.Connection("127.0.0.1",27017)
	db = conn.test #连接库test
	db.authenticate("tage","123") #用户认证


	#//插入数据,_id自动创建
	post = {"id": "1",
 "author": "Mike",
 "text": "My first blog post!",
 "tags": ["mongodb", "python", "pymongo"],
 "date": time.strftime('%Y-%m-%d %H:%M:%S')}
 posts = db.posts
	posts.insert(post) #把post数据插入posts聚合(表)中，返回一个ObjectId('...')
	

	#//批量插入(一个列表里面包含了2个字典),_id自动创建
	new_posts = [{"id": "2",
 "author": "Mike",
 "text": "Another post!",
 "tags": ["bulk", "insert"],
 "date": time.strftime('%Y-%m-%d %H:%M:%S')},
 {"id": "3",
 "author": "Eliot",
 "title": "MongoDB is fun",
 "text": "and pretty easy too!",
 "date": time.strftime('%Y-%m-%d %H:%M:%S')}]
	posts = db.posts
	posts.insert(new_posts) #把new_posts数据插入posts聚合(表)中，返回2个ObjectId('...')


	#//删除数据
	db.posts.remove() #删除posts聚合(表)中所有数据
	db.posts.remove({'id':1}) #删除posts聚合(表)中id为1的数据


	#//更新数据
	db.posts.update({'id':1},{"$set":{"text":"cscscascs"}}) #更新一个value
	db.posts.update({'id':1},{"$set":{"text":"cscscascs","title":"test title"}}) #更新多个value


	#//查询数据
	db.collection_names() #查询所有聚合名称
	db.posts.count() #统计posts聚合中的数据数量
	db.posts.find() #查询posts中所有内容
	db.posts.find_one({"author":"Mike"}) #根据条件查询posts中数据
	db.posts.find({"author":"Mike"}).sort('author') #--默认为升序
	db.posts.find({"author":"Mike"}).sort('author',pymongo.ASCENDING) #升序
	db.posts.find({"author":"Mike"}).sort('author',pymongo.DESCENDING) #降序

>>> import pymongo
>>> import time
>>> db = pymongo.Connection("192.168.xx.xx",27017).linuxyan
>>> posts = db.posts
>>> post = {"id": "1",
... "author": "Mike",
... "text": "My first blog post!",
... "tags": ["mongodb", "python", "pymongo"],
... "date": time.strftime('%Y-%m-%d %H:%M:%S')}
>>> posts.insert(post)
ObjectId('53bd5a5fe138235f74b67563')

#//插入数据成功
#//利用{'author':'Mike'} 测试查询正常
>>> posts.find_one({'author':'Mike'})
{u'_id': ObjectId('53bd5a5fe138235f74b67563'), u'author': u'Mike',....}

#//利用{'_id':"ObjectId('53bd5a5fe138235f74b67563')"}查询为空
>>>posts.find_one({'_id':"ObjectId('53bd5a5fe138235f74b67563')"})	

#//如何利用ObjectId来查询？
>>> from bson import ObjectId
>>> posts.find_one({'_id':ObjectId('53bd5a5fe138235f74b67563')}) 
{ u'_id': ObjectId('53bd5a5fe138235f74b67563'), u'author': u'Mike',....}
#//原来ObjectId是一个对象，而不是一个字符串，此时我只能"呵呵"，折腾两个多小时。