python分配buffer

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python分配buffer

# 场景：一次取回mongodb某表-64万数据，pymongo.errors.DocumentTooLarge: BSON document too large (28888095 bytes) -

# the connected server supports BSON document sizes up to 16777216 bytes. 文档太大就无法返回，因此分10次取，每次

# 取回6400条，然后统一更新到本地的字典中。

import uuid

data = [1, 2, 3, 4, 5, 6, 7, 8, 9, 3, 5, 6, 7, 8, 9, 6, 5, 4, 3, 8, 9]

batch_step = round(len(data)/10)

for index in range(0, len(data), batch_step):

item_list = data[index:index+batch_step]

# example

from pymongo import MongoClient

mdb = MongoClient('120.133.26.xxx:20002', username='xt', password='xxxxxx')

image_ids = ["001", "002", "003", ...]

image_dict = {}

batch_step = round(len(image_ids)/10)

for idx in range(0, len(image_ids), batch_step):

image_ids_part = image_ids[idx:idx + batch_step]

image_infos = mdb['数据库名']['图片表名'].find({"image_id": {"$in": image_ids_part}})

image_one = {}

for image_info in image_infos:

if image_info.get("image_size"):

image_one[image_info.get("image_id")] = image_info

image_dict.update(image_one)