mongodb操作文件
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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.
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‘‘‘ 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()
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