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Can't connect to the server's mongdb database!
ip and port are OK on the server!
bind_ip 0.0.0.0
ip
ask the boss to have a look. No, no, no. It s okay to pay for an answer!
...
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How do I end the entire routing function in the mongodb callback?
as shown in the figure, how to stop executing all the following code after each return. ...
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Nodejs operation mongodb findOne/find setting projection parameter does not work?
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...
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Ask a mongoose document save () question
paste the original data document first:
:
:
what I want to ask is why the day1 update is successful, but day2.time1 can not update the callback of, save (), and how can it be updated successfully without err,?
...
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The problem of how mongoose, mongodb db.collection.find () syntax is introduced into query
query
router.get(" cartList", (req, res, next) => {
User.findOne({ userId: 123456 }, (err, doc) => { });
}
query
router.get(" cartList", (req, res, next) => {
let userId = req.cookies.userId
console.log(user...
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Should entry node.js be paired with mongodb?
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? ...
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Setting cursor error when using aggregate in Node.js
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...
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How do I view all the syntax of Mongoose?
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: { ...
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How to set objectId to userId when mongoose creates a user
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},
...
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About the value passed by the $and operator of mongoDB
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...
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Array type insertion values for mongoose object types
the model is designed as follows
const RegistrationSheet = mongoose.model( RegistrationSheet , new Schema({
doctorId: String,
today: {
time: String,
date: {
morning: [
{
number:Number,
patient: ...
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Error in mongodb configuring SSL
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...
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How mongoose updates a subdocument in a subdocument array
The structure is shown in the figure. Steps is an array. Now you want to modify the count value of a specified date.
...
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How does nodejs design the invitation code to confirm the relationship between the invitee and the invitee?
the invitee opens the web page by connecting: to generate a unique query string. How does the interface get this code value when the user registers and how does it match the inviter? ...
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How is the function that an ip can only register one account?
is it that the database records the current request ip address and then saves a field, and then checks each request to see if it exists, and if so, it prompts that it cannot be registered ?...
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TypeError: Cannot read property 'db' of null appears when node.js interacts with mongodb
I use a third-party package of huya-danmu to monitor the on-screen gift of Huya TV s live studio address: https: github.com BacooTang . and store the on-screen gift information in mongodb. The logic is to obtain all stored addresses of Tiger Tooth s...
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Doubts about mongoose autoIndex
When the official document on mongoose says that the autoIndex property is true, when the application starts, mongoose will automatically call ensureIndex for your schema to ensure that the index is generated. It is good to use this in the development en...
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One of the time fields stored in mongodb is the string type. how to filter the data by time?
mongodb database has a day field that stores the string type, as shown in figure .
now I m going to filter the data for different time periods through the day field, but write like this
req.collections.dayTrainings.count({ phone : req.param( ...
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How does mongoose jointly check and complete the data and then classify and aggregate according to the fields of the joint search?
problem description
< H2 > how does mongoose jointly check and complete the data and then classify and aggregate according to the fields of the joint search? < H2 >
I now have two tables: a product table Product , a product category table Category...
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Use the native mogodb driver to limit the number of array returns in node.js. The same syntax works on the command line, but not in node.
Native mogodb driver is used in node.js to limit the number of array returns. The same syntax works on the command line, but does not work in node
I want to do a paging query DEMO, wants to use db.collection.find ({ "_ id ": ObjectId (_ id)}, { "comme...
