1. Database (MongoDB) connection
(1) Install the application generator express
npm install express-generator -g
(2) Create an application
express application name
(3) Install the mongodb module
npm install mongodb
(4) Convert page rendering type to HTML
a. Load ejs
1）npm install ejs
b.app.js configuration
1）app.set('view',path.join(__dirname,'views'));
2) app.engine('html',require('ejs').renderFile);
3) app.set('view engine','html');
Convert the red box to
c. Change the suffix of the jade file in the views file under the application file to html
(5) Database connection
a. Enter npm start in CMD under the application folder (provided that the MongoDB service is started)
***Won't MongoDB Click here to open the link ***
2. Database (MongoDB) operations
(1) Create a MongoDB database collection
After starting the MongoDB service, run the mongodb file path+bin\mongo.exe
After executing show dbs, you can see all the libraries of the service
show collectionsView all collections
Green is the newly created library
(2) Insert document
insertOne can only insert one piece of data
insertMany inserts multiple pieces of data
To view the data first switch the library use library name
Then query db.collection name.find()
(3) Query data
db.site.find() or db.site.find().toArray() in CMD
************Others are not listed one by one Click here to open the link ****************