Mongodb 客户端 javascript api

MongoDB是一种流行的NoSQL数据库，它以其灵活的数据模型和高性能而受到广泛关注。Mongodb官方提供了一个强大的Javascript API，使得开发人员可以轻松地与数据库进行交互。本文将介绍一些常用的Mongodb客户端Javascript API，并给出相关的示例代码。

javascript
const { MongoClient } = require('mongodb');
async function connectToDatabase() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);
  try {
    await client.connect();
    console.log('Connected to the database');
    // 在这里可以进行后续的数据库操作
  } catch (error) {
    console.log('Failed to connect to the database', error);
  } finally {
    await client.close();
    console.log('Disconnected from the database');
  }
}
connectToDatabase();

javascript
const { MongoClient } = require('mongodb');
async function insertDocument() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);
  try {
    await client.connect();
    const database = client.db('mydatabase');
    const collection = database.collection('mycollection');
    const document = { name: 'John Doe', age: 30 };
    const result = await collection.insertOne(document);
    console.log('Document inserted:', result.insertedId);
  } catch (error) {
    console.log('Failed to insert document', error);
  } finally {
    await client.close();
  }
}
insertDocument();

javascript
const { MongoClient } = require('mongodb');
async function findDocuments() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);
  try {
    await client.connect();
    const database = client.db('mydatabase');
    const collection = database.collection('mycollection');
    const cursor = collection.find();
    await cursor.forEach((document) => {
      console.log(document);
    });
  } catch (error) {
    console.log('Failed to find documents', error);
  } finally {
    await client.close();
  }
}
findDocuments();

javascript
const { MongoClient } = require('mongodb');
async function updateDocument() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);
  try {
    await client.connect();
    const database = client.db('mydatabase');
    const collection = database.collection('mycollection');
    const filter = { name: 'John Doe' };
    const update = { $set: { age: 35 } };
    const result = await collection.updateOne(filter, update);
    console.log('Document updated:', result.modifiedCount);
  } catch (error) {
    console.log('Failed to update document', error);
  } finally {
    await client.close();
  }
}
updateDocument();

javascript
const { MongoClient } = require('mongodb');
async function deleteDocument() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);
  try {
    await client.connect();
    const database = client.db('mydatabase');
    const collection = database.collection('mycollection');
    const filter = { name: 'John Doe' };
    const result = await collection.deleteOne(filter);
    console.log('Document deleted:', result.deletedCount);
  } catch (error) {
    console.log('Failed to delete document', error);
  } finally {
    await client.close();
  }
}
deleteDocument();