Hello everyone, the latest project needs to be docked with the interface of a mall, simply to call their various interfaces, such as ordering, commodity inquiry, freight and so on. in accordance with the previous practice, in order to facilitate stati...
Application scenario: the background management system assigns visible menu permissions to the created users. For example, if user An is assigned 10 menus, then the user can see the 10 menus in the menu bar after logging in. Now the menu is up to 3 leve...
encountered a small problem when practicing: videouseruseriduseridavatar,videouser: then res.send () will execute before User.findOne () . how can I execute res.send () after User.findOne () ? the newcomer at the front end understands Pr...
Table structure: "id":"xxxx" "xxx":"xxx", "catalogs" : [ { "catalog_number" : "4.1", "catalog_name" : "", ...
let articleSchema = new Schema({ title: String, content: String )} let commentSchema = new Schema({ title: String, content: String, article: { type: Schema.Types.ObjectId, ref: Article } )} var Article = mongoose.model( A...
1. Requirements: remote Mongodb cluster data migration needs to be able to support full + incremental migration. 2. Environment: Mongodb version 3.2.10, sharding cluster mode. There are more than 200 million data. 3. Mongosync, that has tried 360 ha...
recently, an interface for reading data has been found to take too long to return in the production environment. Project uses nodejs + mongodb Development dependency: questions such as title: what is the difference between: timed out and so...
my project is to do document management, as long as the content of the document is modified, it is necessary to generate a new version, the old version and the new version can be viewed. Now there is a situation where the structure of the data meta docu...
The data in the collection looks like this: { "_id" : ObjectId("5acc90cd66178815e8f6647b"), "parent_id" : "5ac97f4a63e8db17cc20f799", "standard_number" : "DZJW 2103.72017", "standard_chin...
linux system starts after installing MongoDB: . bin mongod: error while loading shared libraries: libssl.so.10: cannot open shared object file: No such file or directory ...
In MongoDB, there is a piece of data that I want to modify, workerStats.stage=LABEL and workerStats.idOfWorker=admin stats in labeledItems to increase it by 1. { "_id" : ObjectId("5ac1ff4c87c0fc67c0f4fe60"), "_cla...
mongoose defines required, min, max and other validators in scheme, which seems to validate only the documents to be inserted by create (), but does not seem to validate the documents to be updated by update (). if so, what is the use of this validati...
mongodb can be connected through php connection without permission authentication, and the data can be read out. $con = new MongoClient(); but after adding user rights authentication, it keeps prompting fatal error, authentication failed, etc., tha...
the code is as follows: recode1 = table_out.find ({}). Sort ([( "_ id ", 1)]) .limit (10000) print ( total: , recode1.count ()) directly understand that the number of count () given by print should be 10,000, but what is currently output is the tota...
A document with the following structure needs to match the value under property according to the search criteria. As long as one is matched, the result set is calculated . :db.coll.find({"property":{"test1_field_1": a }}) property ...
has the following code: let result = { data: { values: [], } }; try { let baseInfo = await baseinfoModel.getSystemInfo(); if (baseInfo === null) { return null; } else { baseInfo.forEach(fun...
for example, ask for documents that can be run by combining springboot2 with mysql and mongodb at the same time ...
mongodb:3.6.5 node:9.9.0 koa:2.5.0 npm-mongodb:3.0.5 problems encountered: query with findOne find with projection parameters return results in node with deleted fields router.post( manage , async(ctx, next) => { var users = d...
as shown in the figure, how to stop executing all the following code after each return. ...
want to learn nodeJS, learn online tutorials, use express+mongoDB to do a simple blog system, occasionally do not connect to the network to start the project, the result is wrong, can not start normally, when the network connection is normal, everything...
as shown in the figure, when you jump to a component, the corresponding left navigation turns red. the class that controls highlighting is as follows: .active{ backgournd-color:yellow; } how to achieve it? there is no train of thought at all....
hexo new page tags ...
The same is true in the debugging tools of browsers, but there is no problem when it is displayed on the web page. Is there any solution for crawlers made with node ...
by John von Neumann def MergeSort(lists): if len(lists)<=1: return lists num=int(len(lists) 2) left=MergeSort(lists[:num]) right=MergeSort(lists[num:]) return Merge(left,right) def Merge(left,right): l,r=...
question 1: 1, the array of $array is as follows: array (size=7) 1 => string 2018-09-21 (length=10) 2 => string 2018-09-22 (length=10) 3 => string 2018-09-23 (length=10) 4 => string 2018-09-24 (length=10) 5 =>...