for example, A table stores the article status table, such as recording the status field to mark that the article has been published, published successfully, failed, and so on B table. Store the article data table, for example, there is a field: click...
ask God: now there are two Mongo libraries of master and slave nodes. If you want to change to copy mode, is there any good plan to ensure that the incremental data of master and slave nodes is stable from Synchronize to replica cluster? Or is there any...
my website worked normally for a period of time after it was released, but after a period of time, there were 502 visits, and all visits were 502. Only after restarting the IIS application pool can I access it properly. But the same problem will arise af...
configure ssl for MongoDB: net: port: 27017 bindIp: 127.0.0.1 ssl: mode: requireSSL PEMKeyFile: etc ssl mongodb.pem CAFile: etc ssl ca.pem restart: service mongod restart then: mongo-- ssl-- host www.ericchoo.cn-- sslPEMKe...
as follows: after Filter, you are grouped. The two fields are grouping conditions. however, I just want to get the time in the packet, that is, the data whose fdate is the largest. how can I do that? db.SEC_2018_05_12.aggregate([{ $match : { fyear ...
first contact with nosql there are some questions about the table structure such as designing a game user table should the user s backpack be included in the user table or create a separate table? user { _id: , name: , emai...
has the following two Model (1) user Model var usersSchema = new Schema({ f_id: { unique: true, type: String }, f_name: String }) (2) record Model var batchMainSchema = new Schema({ f_id: { unique: tr...
1. What kind of record is used in the card game record? I think MongoDB would be better, wouldn t it? 2. Is the logic of playing cards in any language? Is it okay to develop with php ? 3. are the rules of the game and card logic quite difficult? ...
after logging in to mongodb show collections2 db.system.users.find() : db.system.users.remove({user: "bear "}) : now if you want to delete this right, what should I do?! Ask for advice ...
1. When querying according to the center point of the mesh, polygons occupy the mesh but do not contain the center point of the mesh, so the mesh information will not be matched. 2. So if you want to check the boundaries and polygons of the mesh, you a...
the model is designed as follows const RegistrationSheet = mongoose.model( RegistrationSheet , new Schema({ doctorId: String, today: { time: String, date: { morning: [ { number:Number, patient: ...
db.inventory.find( { $and: [ { price: { $ne: 1.99 } }, { price: {$exists: true } } ] } ) this query selects all documents in the collection inventory, provided that price is not equal to 1.99 and the price field exists. My problem is that I now need to...
moongDB 3.6version, window10 system, data insertion is not displayed, click Collections to report an error, and Xiaobai asks for advice ...
my mongodb is a MMAPv1 engine, how to view and set lock granularity? ...
const UserSchema = new Schema({ userId:Schema.Types.ObjectId, username: String, mobile: String, password: String, remarks: String, createAt: {type: Date, default: Date.now}, updateAt: {type: Date, default: Date.now}, ...
< H2 > question < H2 > when find () is used in findAddUsers.js , the data can be read normally, but there is no data in return < H2 > Code < H2 > findAddUsers.js const mongoose = require( mongoose ) let Schema = mongoose.Schema let UserSchem...
id! this is my current practice. The problem is that the last res.send () only deals with the first traversal. If you put res.send () outside the traversal, the value of goodsList does not change. Is there a big answer? ...
at present, a new ChangStream feature has been added to mongo3.6, which makes it easy to retrieve incremental data. But prior to version 3. 6, only the original oplog could be used. On the other hand, there are a large number of $set modifier operations ...
first of all, I have a club community table (collection); then I want to find the community with the Chinese character in its name according to the fuzzy search of the input Chinese character. For example: societies are: "Tianyue run " and "Tianyue V...
MongoDB data are as follows > db.foo.find() { "_id" : ObjectId("5ae84b29fca5249951cadc26"), "id" : 1, "datas" : [ { "content_type" : 0 } ] } { "_id" : ObjectId("5ae84b29fca5249951cadc2...
A company had no idea after thinking about the interview questions for half an hour. $arr = [ [4, 5, 9, 4, 1], [11, 14, 9, 6, 20], [21, 44, 90, 16, 21], [16, 34, 99, 600, 230], [121, 18, 89, 60, 33] ] the array $arr [0] [0] is th...
Lieutenant WeChat Mini Programs push the data to the array, and the array renders the picture. It has been a mistake all day. Is there a boss? before adding is there a big shot? wxml: < scroll-view class= " " scroll-x style= "width: 580rpx swi...
Flutter write an app, OS without publishing to Apple app store, and download it directly from the web, can you not run it? see that some will put an activation code on the download page, saying that the ios version needs to enter the activation code to ...
<div><button>< button>< div> btn.addEventListener("click", function(){ console.log("btn"); },false); div.addEventListener("click", function(){ console.log("div"); }, false); Ther...
We have a requirement, that is, under the vue project, I know the absolute path of a certain image file, such as D: course 109 test.jpg . How can I read this file and display it on the web page? If you use it directly, it will be prefixed, such as loca...