mongodb操作文件，主要是通过GridFS类。存储文件主要存放在fs中，其中的fs是数据库默认的。并且GridFS是直接与数据库打交道，与collection集合无关。
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https://docs.mongodb.com/manual/core/gridfs/
When to Use GridFS
In MongoDB, use GridFS for storing files larger than 16 MB.
=======================
'''
Created on 2013-8-6
class mongoInsert
@author: tree
'''
__metaclass__ = type import os
from pymongo.database import Database
import time
import gridfs class mongoImg(object):
"""mongoInsert is a class for inserting document """
def __init__(self, database, dir):
"""Create a new instance of :class:mongoInsert
:Parameters:
- `database`: database to use
- `dir` : directory of document
"""
if not isinstance(database, Database):
raise TypeError("database must be an instance of Database")
if len(dir) < 1:
raise TypeError("dir must be an string of directory") # self.__con = Connection()
self.__imgdb = database
self.__imgfs = gridfs.GridFS (self.__imgdb)
self.__dir = dir
self.__filelist=[] #save filepath in list.txt
def __dirwalk(self,topdown=True):
"""traverse the documents of self.__dir and save in self.__filelist
"""
sum=0
self.__filelist.clear() for root,dirs,files in os.walk(self.__dir,topdown):
for name in files:
sum+=1
temp=os.path.join(root,name)
self.__filelist.append(temp)
print(sum) #insert image
def insert(self):
"""insert images in mongodb
"""
self.__dirwalk() tStart = time.time()
for fi in self.__filelist:
with open (fi,'rb') as myimage:
data=myimage.read()
self.__imgfs.put(data, content_type = "jpg", filename =fi) tEnd =time.time ()
print ("It cost %f sec" % (tEnd - tStart)) #get image by filename
def getbyname(self,filename,savepath):
"""get img from mongdb by filename
"""
if len(savepath) < 1:
raise TypeError("dir must be an string of directory")
dataout=self.__imgfs.get_version(filename)
try:
imgout=open(savepath,'wb')
data=dataout.read()
imgout.write(data)
finally:
imgout.close()