本文介绍了如何通过Python的PyMongo库连接MongoDB数据库，并演示了文件的读取过程，包括下载特定文件到本地。
1.安装pymongo model:
$ wget http://pypi.python.org/packages/source/p/pymongo/pymongo-2.3.tar.gz
$ tar xzf pymongo-2.3.tar.gz
$ cd pymongo-2.3
$ python setup.py install
2.执行pyton
import pymongo
import gridfs
import gridfs.errors
con = pymongo.Connection('localhost', 27017)
db = con.hisextensiondb
db.authenticate('root','')
fs = gridfs.GridFS(db)
filename= '1124831'
outDir = '/tmp/'+filename+".txt";
doc = db.fs.files.find_one({'filename':filename})
filestream = fs.get(doc['_id'])
output = open(outDir, 'wb')
output.write(filestream.read())
output.close()
$ wget http://pypi.python.org/packages/source/p/pymongo/pymongo-2.3.tar.gz
$ tar xzf pymongo-2.3.tar.gz
$ cd pymongo-2.3
$ python setup.py install
2.执行pyton
import pymongo
import gridfs
import gridfs.errors
con = pymongo.Connection('localhost', 27017)
db = con.hisextensiondb
db.authenticate('root','')
fs = gridfs.GridFS(db)
filename= '1124831'
outDir = '/tmp/'+filename+".txt";
doc = db.fs.files.find_one({'filename':filename})
filestream = fs.get(doc['_id'])
output = open(outDir, 'wb')
output.write(filestream.read())
output.close()
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