文章目录

  • ​​1 Gridfs和bson存储大文件​​
  • ​​1.1 Gridfs​​
  • ​​1.2 bson上传(<16m)​​

1 Gridfs和bson存储大文件

GridFS 用于存储和恢复那些超过16M（BSON文件限制）的文件(如：图片、音频、视频等)，适合于不常改变但是经常需要连续访问的大文件。​​pymongo 利用gridfs构建大文件存储系统​​

1.1 Gridfs

import os
import sys
from gridfs import *
from pymongo import MongoClient
from datetime import datetime
from bson import binary

#连接数据库
client = MongoClient("localhost:27017",username="kg",password="123",authSource="kgraph") 

#定义上传和下载的文件夹
up_path = "/Users/enjlife/Desktop/cv/"
do_path = "/Users/enjlife/Desktop/temp/"

#使用Gridfs获取数据库集合
db = client.kgraph
mycol = db.list_collection_names() # 查看集合列表
fs = GridFS(db, collection='pdfs')

#定义上传和下载函数
#批量上传 Gridfs
def gd_upload(fs,up_path):
    for filename in os.listdir(up_path):
        dic = {}
        dic["fname"] = filename
        # dic["上传时间"] = datetime.now()
        content = open(up_path + filename,"rb").read()
        fs.put(content,**dic)
def gd_download(fs,do_path):
    for cursor in fs.find():
        name = cursor.fname
        content = cursor.read()
        with open(do_path + name,"wb") as f:
            f.write(content)    


mycol = db.list_collection_names() # 查看集合列表，Gridfs会分两部分上传
#['pdfs', 'pdfs.files', 'pdfs.chunks']

#查看结果
col = db.pdfs.files
for x in col.find():
    print(x)

1.2 bson上传(<16m)

接上面连接数据库获取的col

col = db.pdfs

def bs_upload(col,uppath):
    dic = {}
    dic["fname"] = "FastR-CNN.pdf"
    data = open(up_path + "FastR-CNN.pdf","rb").read()
    if not col.find_one({"fname":"FastR-CNN.pdf"}):
        dic["bdata"] = binary.Binary(data)
        col.insert(dic)

​​python利用mongodb上传图片数据 : GridFS 与 bson两种方式​​python下上传/下载各种格式文件到MongoDB数据库中