pymongo

pymongo - Message length is larger than server max message size

由 断了今生、忘了曾经 提交于 2021-01-27 07:31:38
问题 the line for doc in collection.find({'is_timeline_valid': True}): is giving the Message Length error. How can I get all the collection without the error? I know about the find().limit() but I don't know how to use it. Code: from openpyxl import load_workbook import pymongo import os wb = load_workbook('concilia.xlsx') ws = wb.active client = pymongo.MongoClient('...') db = client['...'] collection = db['...'] r = 2 for doc in collection.find({'is_timeline_valid': True}): for dic in doc[

Pymongo bulk inserts

由 ￡可爱￡侵袭症＋ 提交于 2021-01-27 06:18:07
问题 I am trying to insert documents in bulk. But it doesn't insert more than 84 documents during bulk insert. Gives me this error: in insert pymongo.errors.InvalidOperation: cannot do an empty bulk insert Is it possible to do batch inserts, like inserting 50 documents per insert? 回答1: Check out the documentation for bulk inserts in PyMongo. You just pass a list of dicts to insert(). If the list is empty, PyMongo raises an exception, as you've observed. 回答2: Late to the game here but have had good

In Mongo any way to do check and setting like atomic operation?

由 柔情痞子 提交于 2021-01-27 04:52:07
问题 Is in Mongo any way to do check and setting like atomic operation ? I am making booking for hotels and if there is free room you can reserve, but what if two or more people want to reserve in same time. Is there anything similar to transaction in Mongo or any way to solve this problem ? 回答1: Yes, that's the classic use case for MongoDB's findAndModify command. Specifically for pymongo: find_and_modify. 回答2: All updates are atomic operations over a document. Now find_and_modify locks that

Python爬虫之四仓库（数据库）

由 99封情书 提交于 2021-01-22 12:13:59
Sqlite数据库 第三方库名：sqlite3 import sqlite3 #创建数据库连接对象 conn = sqlite3 . connect ( "my_data.db" ) #创建数据库操控对象 control = conn . cursor ( ) #查询 #返回可迭代对象 info = control . execute ( "select * from novel" ) data = [ i for i in info ] ##增加 ##返回操控对象,插入值需要注意，字符串要用单引号括起来 control . execute ( "insert into novel(id,name,author) values('{}','{}','{}')" . format ( "1" , "虚之神" , "小書" ) ) conn . commit ( ) ##删除 ##返回操控对象,删除值需要注意，字符串要用单引号括起来 control . execute ( "delete from novel where name = '{}'" . format ( "虚之神" ) ) conn . commit ( ) #修改 #返回操控对象,修改值需要注意，字符串要用单引号括起来 control . execute ( "update novel set author = '{}

Does Pymongo have validation rules built in?

由 别说谁变了你拦得住时间么 提交于 2021-01-21 09:46:53
问题 I am trying to validate an inserted document against a schema, and was trying to find a way to validate the inserted document. There are libraries like MongoEngine that say they do the work, but is there a way to do document validation directly via pymongo ? 回答1: The python driver docs are indeed a little light on how to use the db.command . Here is a complete working example: from pymongo import MongoClient from collections import OrderedDict import sys client = MongoClient() # supply

Does Pymongo have validation rules built in?

由 本秂侑毒 提交于 2021-01-21 09:46:04
问题 I am trying to validate an inserted document against a schema, and was trying to find a way to validate the inserted document. There are libraries like MongoEngine that say they do the work, but is there a way to do document validation directly via pymongo ? 回答1: The python driver docs are indeed a little light on how to use the db.command . Here is a complete working example: from pymongo import MongoClient from collections import OrderedDict import sys client = MongoClient() # supply

How do I query an array of dictionaries in MongoDB?

由 耗尽温柔 提交于 2020-12-30 07:46:25
问题 I have an array of dictionaries on which I have to make queries. The queries will be like when "name" is "a" then "value" should be "2". { "t": "m", "y": "n", "A":[ { "name": "x", "value": "1" }, { "name": "y", "value": "2" }, { "name": "z", "value": "1" } ] } In the above, I want to know what are the records whose "value" is "1" when "name" is x. I also need to make queries like, where "name" is "x" then value should be "2" and "name" is "y" then "value" should be "1" 回答1: You have to use

Pymongo using $exists

由 Deadly 提交于 2020-12-29 12:34:25
问题 I'm new to pymongo and having trouble using exists. When using collection.find({},{"cwc":{"$exists": True}}) I get the following error Unsupported projection option: $exists What I'm trying to accomplish is to find all '_id' and 'cwc' where 'cwc' exists and not empty. 回答1: This works for me. collection.find({"cwc":{"$exists":True}}) The only difference is removed the first argument. 回答2: collection.find({"$and":[ {"cwc":{"$exists": True}}, {"cwc":{"$ne": ""}}]}) 来源： https://stackoverflow.com

Pymongo using $exists

由 旧城冷巷雨未停 提交于 2020-12-29 12:31:22
问题 I'm new to pymongo and having trouble using exists. When using collection.find({},{"cwc":{"$exists": True}}) I get the following error Unsupported projection option: $exists What I'm trying to accomplish is to find all '_id' and 'cwc' where 'cwc' exists and not empty. 回答1: This works for me. collection.find({"cwc":{"$exists":True}}) The only difference is removed the first argument. 回答2: collection.find({"$and":[ {"cwc":{"$exists": True}}, {"cwc":{"$ne": ""}}]}) 来源： https://stackoverflow.com

Scrapy（4）spider 帮助你寻找最美小姐姐

由 谁说我不能喝 提交于 2020-12-27 10:09:32
我们都知道我们平常想下载一些漂亮的图片来装饰自己的桌面，可是找到了都是需要收费的网站，真的很恼火，所以今天小编，可能要带大家实现这么一个工具，可以用来爬取某个网站的好看的图片 兴不兴奋啊，是的超级兴奋，现在这里透漏一下，以后每天都会同时更新 《今日金融词汇》《每日一道 python 面试题》 ，敬请期待，谢谢关注， 欢迎点赞，关注，收藏三连击 ，只看，不关注，不是好汉，哈哈开玩笑 哈哈，行了我们进入主题吧 附上链接地址 https://image.so.com/ 创建项目前，我们需要来分析下网站数据，进入 首页，点击美女，我们可以知道跳转到这个页面，可以看出数据是通过 jsonp 的形式，进行 ajax 渲染的，而且每一次刷新页面这个函数都会随机变化，也就是说可能写出来的代码是具有时效性的 我们再随机点击一张图片进入看更加详细的页面， 就来到了这个页面，我们 f12 一下，可以看到数据是这样的，具有每张图片的详细信息，点击这个链接，进入 preview https: //image.so.com/zjl?ch=beauty&direction=next&sn=0&pn=30&prevsn=-1 我们可以看到有图片的详细信息了，id，title，imgurl 然后我们再看看 header,里面需要哪些参数，从图上看，我们需要 ch, sn, pn 我们可以拼接出来这样一个链接
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