


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:
- Use
MongoClient
Connect to the MongoDB database. - Create a collection (table) and insert data.
- Use the
deleteOne()
andupdateOne()
methods to delete and update data. - Use the
find()
method to query data, and usetoArray()
to obtain the results.
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