Business background has recently been learning koa + mongoose to build api server as a result, I feel very painful about the current operation flow the current operation flow is as follows create mongoose model file model user.js ...
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...
this ID is clearly documented. Why report this error? ...
problem description version: koa@1.2.2,mongoose@5.4.1 request test . The doc that is queried and returned has information, but the front end always prompts interface 404 whether to return the data queried in the database asynchronously, but doe...
Two tables in mongodb, one is users and the other is called userDetails. What needs to be done now is that according to the user details corresponding to the userId query, the query is operated in userDetails. has been tested that the data in the table...
function searchData(){ NodeInfo.find({}, function(err, res){ if(err) { console.log("Error:" + err); } console.log(JSON.stringify(res,null,2)); 1 return res; }) } let a = searchData(); conso...
problem description egg project uses mongoose mongoose to report error failed to connect to server, PRIMARY:hostA, master node SECONDARY:hostB, hostC; slave node one master and two slaves, both ports are 27017 copy set set:rs0 Url: mongodb: ...
problem description egg project uses mongoose mongoose to report error failed to connect to server, PRIMARY:hostA, master node SECONDARY:hostB, hostC; slave node one master and two slaves, both ports are 27017 copy set set:rs0 Url: mongodb: ...
when you create a user, you will first query the data in the table. There is a mistake here in the query. I don t understand the reason. Please give me some advice: user model: models User.js const mongoose = require( mongoose ); const Schema = ...
problem description after the post request is sent by the current end, the database successfully writes the data, but the backend still reports an error of Error: connect ECONNREFUSED 127.0.0.1, and returns 500. the environmental background of the p...
mongodb join table queries can either use mongoose s pupulate (), or aggregate $lookup, if you use two single table queries: one { _id: "joe", name: "Joe Bookreader" } two { patron_id: "joe", street: "...
is to create a data table of contacts, and then the front end searches the corresponding friends through its own username and traverses to the page this is my mongoose schema var contactSchema = new Schema({ user1:{ type:Object, required:true...
< H2 > for example, there are two tables < H2 > student Table id-> user id name-> user name classId-> Class id class Table id-> Class id name-> Class name if I want to query the information of all the students and the class information they b...
requirement description: mongodb contains the main information of two collection,theme storage topics, as well as an array of product id. Now if you want to find out the details of the products in products through the detailed id of the product, how sh...
query conditions are composed of String and List, such as: (List < String > id, String location, String status,.) The exact number of fields in the parameter is not certain. There may be more than one . how to implement this situation? you d better ...
when I want to display the time when I want to leave a comment, my schema is written like this. After using moment.js, it shows the time when I wrote the comment for the first time after restarting node, and the time for writing the comment is the same ...
question: is it not recommended to use multi-table queries for mongodb non-relational databases? ...
question: at present, what images are stored in mongodb is only a relative drive, so how to provide a complete image path to the server when returning to the front end? in the database: products img1.png actual returned data: http: xxx.xxx.xxx.xx...
such as: how to open the log of the spring-data-mongodb tool in ssm and print the sql execution statement? the above article seems to solve my problem, but I don t know in which file it is set up? ask for help! ...
the specific code is as follows: node beginners, excuse me const mongoose = require( mongoose ); mongoose.connect( mongodb: ) mongoose.model( content ,{}).find({}) .then( feeds =>{ console.log(feeds); }) the printed result ...
debugging a third-party sdk, can run all dependent packages directly under the project directory, but put some of these packages into the maven repository and then quote them and report an error. The runtime indicates that a referenced class cannot be fo...
enter python-m SimpleHTTPServer 8888 in windows cmd & access the local file how to check out this access what should I do if I want to go back to the original interface after I visit the local file ...
customer server connection server shows that the connection is successful, but one of the functions reports an error socket_read (): unable to read from socket [10060] the code is as follows <?php header( Content-Type: text html; charset=gb2312 )...
in a page index.html, iframe is used <iframe name="iFrame" allowtransparency="true" src=" aaa bbb.html?name="tom"&sex="male" width="100%" height="100%" id="student" s...
sudo easyinstall pip error python version is included in the system 2.7.10 , openssl version is OpenSSL 0.9.8zh 14 Jan 2016 , macos is 10.12.6 specific error reports are as follows: $ sudo easy_install-2.7 pip Password: Searching for ...