such as now I want to design an online seat selection system but when users sign up, they can dynamically edit unreserved seats in the background how should I design it from the generation of seats to the final registration, seat selection and editing...
for example, go connection mysql, https: github.com jmoiron sqlx is a client that implements official database sql, and an additional driver: https: github.com go-sql-dri. is required to use it. but this is not the case when I connect to mongodb. ...
the local backend I use on web is mongodb,express, plus proxy to solve cross-domain problems. can WeChat Mini Programs s local or future online backend use mongodb? what does the local backend need to change? I use Mini Program to send a request to my ...
our company wants to set up a financial reconciliation system because of the rise in business, and then give it to me to design. data currently available: sales orders and bank flows. requires reconciliation once a month to check whether the customer...
router.get( VaguePartner , function (req, res, next) { const keyWords = req.query.keyWords t_Superior.find().populate( consumer firstsuperior ).where( consumer ).or([ { nickname : { $regex : keyWords, $options: $i } }, ...
this is the properties of my springboot configuration mongodb spring.data.mongodb.uri=mongodb: username:password-sharp@yoururl:port xfind?replicaSet=mgset-5652935,dds-bp14d30374d4cbb42723-pub.mongodb.rds.aliyuncs.com:3717 com.mongodb.MongoSecurityExc...
question In business, all tables in the database need to be queried and statistically analyzed and shown in the echats figure. The previous data is fine when the data is small, and the cache can barely support the column . now there is nearly 1 mi...
I have read the document for a long time, and I have a general understanding of the concept grammar and so on, but when I really write it, I still have a lot of problems and always get stuck. such as the following this.ctx.model.Role.remove({ _id: { ...
demand: when querying the list of articles, the management interface also displays the total number of articles that meet the query criteria. For example, the search article content on the page contains the list of articles with artificial intelligenc...
I created the xfind library using use xfind, but show dbs does not display the library, only the db command does, which is why ...
question background description: an online examination system. When designing a database to store test questions, if you use a collections to store basic questions, medium-range questions, and high-level problems, store them by setting the properties...
configure the service through the command mongod.exe-- config F: mongodb conf mongodb.config-- install-- serviceName "mongodb " , as shown in the following figure this is the content of the configuration file: dbpath=D: MongoDB Server dat...
I configured slf4j and morphia in the project <dependency> <groupId>org.mongodb.morphia< groupId> <artifactId>morphia< artifactId> <version>1.3.1< version> < dep...
the previous parameter setting of cursor was incorrect, but now it has been modified: :Error: Arguments must be aggregate pipeline operators want to know why there is an error in the first way. I think many examples are written in the middle of t...
An error occurred while loading navigation: hostInfo is forbidden by cloud provider for security reason, you can run `db.runCommand({listCommands: 1})` to get the supported command list, bad cmd: { hostInfo: 1 } ...
directory structure: main.js: comment.js failed to get the data routed from the backend. I just want to extract the content data from the data in the backend and process it myself, otherwise the data will have no spaces and line breaks ...
the main front-end Xiaobai, want to learn the back-end, online search information is node plus mongodb, would like to ask these two together more than mysql match? ...
mysql queues multiple insert requests arriving at the same time one by one, maintaining a maximum of 1000 request queues. does mongodb handle multiple insert requests arriving at the same time in the same way as mysql, or can multiple insert requests ...
I currently have a query using mongodb3.4, that needs to be paged. Paging needs to return the total number and number of pages. but that s the problem. Paging queries are fast, but counting is slow . The count statement is as follows: db.message.fin...
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problem description React does not recognize the htmlType prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase htmltype instead. If you accidentally passed it from a parent component...
I want to pass the IP address in vue-cli, but I can t get the IP address. ...
const http = require( http ); const urllib = require( urllib ); const keepaliveAgent = new http.Agent({ keepAlive: true, }); const server = http.createServer((req, res) => { res.end( Hello World, + req.connection.remotePort); }); server.o...
Bazel builds the golang project, how to set this item? The official document has the following paragraph: https: github.com bazelbuild. Add the code below to the BUILD or BUILD.bazel file in the root directory of your repository. Replace the strin...
for example, I call a function func_test ( abc ) . Here I pass a parameter of abc . What words should I use to translate in English? ...