in the case of mongo with a password, I first remove users directly in admin. Now, if you start without a password, mongo will always restart. How to restore < H2 > Startup parameters < H2 > mongod --bind_ip 10.32.254.4 --port 28011 --dbpath rs1 mon...
I run the single file directly without import errors. In addition, it is normal for me to use mongodb in the py file alone, but when I run it in the scrapy project, I will say that the import failed. Why? import json import pymongo from scrapy.utils.pr...
there is an array cateogoryList in the defined Schema: const mongoose = require( mongoose ); const Schema = mongoose.Schema; const ProductCateogorySchema = new Schema({ user:{ type:Schema.Types.ObjectId, ref:"users...
I want to make a log analysis system based on mongodb. A single document is as follows: { "_id" : ObjectId("5c6a14c4421aa97a4714b291"), "some":"data" "startTime" : ISODate("2019-02-18T0...
related codes Please paste the code text below (do not replace the code with pictures) official documents should be from a long time ago. Is there any latest technical point pecl download mongodb cd mongodb-1.5.2 vim src libmongoc src libmong...
await Model.find({}).sort({}).skip(1).limit(10).exec(); if this is the case, I can understand that lazy chain calls, the previous call cache parameters, execute the exec function using the cached parameters to execute the request await Model.find({})...
how is Zhihu s database designed? what I don t understand is how Zhihu s questions and concerns are designed? agree with the answer, focus on the question, and how is it stored? ...
problem description recently, middleware (body-parser) in express suddenly fails, req.body can not get any value , req.query can get the value . It was useful to add body-parser middleware at first, until yesterday when token was added, body-p...
when I first came into contact with GO, I encountered some problems. if it is mysql, our fields are fixed, but in mongodb, each record can have different fields. For example, the first record field is {A B C D} . The second record is {A B C D E} E a...
first of all, what we do is the examination system, which involves the function of randomly selecting questions. The test questions are saved in mongodb, and the number of test questions is very large. We want to solve the following problems. randomly ...
I want to group statistical arrays, and then the condition is the time region, how to achieve [Error] A pipeline stage specification object must contain exactly one field. at line 1, column 1 db.getCollection("user_reg").aggregate([ ...
use nodejs, express and MongoDB to do a set of services, but the response time of the interface is very long. The test removes the query database and finds that the response time is reduced to 1200 milliseconds. the following is my code, ask for advic...
Mongoose sorting by a field in the reference document does not work I want to sort by aliInfo.creditLev in owner, but the result does not work. I changed several fields that do not take effect. I feel that the sort in populate is misused. Please wr...
I don t understand why there is something wrong with mongodb s connection after writing a login interface. As long as a login request is sent, after the request ends, its service will exit directly. when starting the service, connect to the database...
version: Mongoose = 4.13.14 mongodb = 3.2.20 problem description for example, use mongoose to create a new document, and fields of type Mixed (or Object) cannot be inserted into the database even if the default value is set. What is the reason fo...
> db.zhipin_cookie.find()[0] { "_id" : ObjectId("5c3e89b5cfab5493e7c04e1c"), "cookie" : [ "_umdata=C234BF9D3AFA6FE77F94838529E088A9BBD97FE15A9C993647E1BA8899EBCF18025B4DFBCA9E6B73CD43AD3E795C914C12AFE5...
for example, multiple documents with the following format (only one is written below): [ key { "subkey1": ..., "subkey2": ..., "subkey3": ... }, { "subkey1": ..., "subkey2": ..., "subkey3&qu...
nodejs should be able to meet high concurrency by using asynchronous callback. but when using postman for interface stress testing, it is found that the next interface requests only after the previous interface gets a response, and the response time i...
the mongodb database is deployed on the cloud server, and the super administrator node is set up according to the steps on the Internet. here is my node code var url = "mongodb: kezuncheng:123456@127.0.0.1:27017 "; router.post( regist...
recently, I m going to take relational algebra; that is, database principles; my first contact is an abstract sql statement (I don t know if that s right). now I d like to ask, what kind of database should the relational algebra of this way of writ...