Python操作MongoDB数据库PyMongo库使用方法

引用PyMongo

>>> import pymongo
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创建连接Connection

>>> import pymongo

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

>>> from pymongo import Connection

>>> conn = Connection('localhost',27017)
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创建Connection时，指定host及port参数

>>> import pymongo
>>> conn = pymongo.Connection(host='127.0.0.1',port=27017)
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连接数据库

>>> db = conn.ChatRoom
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或
>>> db = conn['ChatRoom']
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连接聚集

>>> account = db.Account
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或
>>> account = db["Account"]
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查看全部聚集名称

>>> db.collection_names()
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查看聚集的一条记录

>>> db.Account.find_one()

>>> db.Account.find_one({"UserName":"keyword"})
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查看聚集的字段

>>> 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'}
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查看聚集的多条记录

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

>>> for item in db.Account.find({"UserName":"libing"}):
        item["UserName"]
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查看聚集的记录统计

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

>>> db.Account.find({"UserName":"keyword"}).count()
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聚集查询结果排序

>>> 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
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聚集查询结果多列排序

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

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

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

>>> db.Account.remove()   -- 全部删除

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