How to implement database addition, deletion, modification and query in nodejs

Database addition, deletion, modification and query in Node.js: Connect to the database: Use MongoClient to connect to the MongoDB database. Insert data: Create a collection and insert data. Delete data: Use deleteOne() to delete data. Update data: Use updateOne() to update data. Query data: Use find() and toArray() to query and obtain data.

Database addition, deletion and modification query in Node.js

1. Connect to the database

const MongoClient = require('mongodb').MongoClient; const url = 'mongodb://localhost:27017'; const client = new MongoClient(url);

2. Insert data

const collection = client.db('myDatabase').collection('myCollection'); await collection.insertOne({ name: 'John Doe', age: 30 });

3. Delete data

await collection.deleteOne({ name: 'John Doe' });

4. Update data

await collection.updateOne({ name: 'John Doe' }, { $set: { age: 31 } });

5. Query data

const cursor = await collection.find({ age: { $gt: 30 } }); const results = await cursor.toArray();

Details:

• UseMongoClientConnect to the MongoDB database.
• Create a collection (table) and insert data.
• Use thedeleteOne()andupdateOne()methods to delete and update data.
• Use thefind()method to query data, and usetoArray()to obtain the results.

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