Python操作MongoDB数据库PyMongo库使用方法

>>> import pymongo

>>> import pymongo

>>> conn = pymongo.Connection('localhost',27017)

>>> from pymongo import Connection

>>> conn = Connection('localhost',27017)

>>> import pymongo
>>> conn = pymongo.Connection(host='127.0.0.1',port=27017)

>>> db = conn.ChatRoom

>>> db = conn['ChatRoom']

>>> account = db.Account

>>> account = db["Account"]

>>> db.collection_names()

>>> db.Account.find_one()

>>> db.Account.find_one({"UserName":"keyword"})

>>> db.Account.find_one({},{"UserName":1,"Email":1})
{u'UserName': u'libing', u'_id': ObjectId('4ded95c3b7780a774a099b7c'), u'Email': u'libing@35.cn'}

>>> db.Account.find_one({},{"UserName":1,"Email":1,"_id":0})
{u'UserName': u'libing', u'Email': u'libing@35.cn'}

>>> for item in db.Account.find():
        item

>>> for item in db.Account.find({"UserName":"libing"}):
        item["UserName"]

>>> db.Account.find().count()

>>> db.Account.find({"UserName":"keyword"}).count()

>>> db.Account.find().sort("UserName")  --默认为升序
>>> db.Account.find().sort("UserName",pymongo.ASCENDING)   --升序
>>> db.Account.find().sort("UserName",pymongo.DESCENDING)  --降序

>>> db.Account.find().sort([("UserName",pymongo.ASCENDING),("Email",pymongo.DESCENDING)])

>>> db.Account.insert({"AccountID":21,"UserName":"libing"})

>>> db.Account.update({"UserName":"libing"},{"$set":{"Email":"libing@126.com","Password":"123"}})

>>> db.Account.remove()   -- 全部删除

>>> db.Test.remove({"UserName":"keyword"})