#yyds干货盘点#node.js链接MongoDB数据库

在这之前

yarn add mongodb      

常见的连接方法

const { MongoClient } = require('mongodb')
const url = "mongodb://localhost:27017"
const dbName = 'myProject' // 这里写需要操作的数据库
const mongoClient = new MongoClient(url);

mongoClient.connect(function (err, client) {
    if (err) throw err
    console.log('connect to the database!')
    const db = client.db(dbName);
    //这中间可以写对db的任何操作
    client.close(); //关闭数据库
});      

MangoDB官网的方法

const { MongoClient } = require('mongodb')

async function main(){
    const url = "mongodb://localhost:27017"
    const client = new MongoClient(url);
    try {
        await client.connect();
        console.log('Access to database!')
        await listDatabases(client)
    } catch (e) {
        console.error(e);
    } finally {
        await client.close();
    }
}
main().catch(console.error);

//列出所有数据库
async function listDatabases(client) {
    const databasesList = await client.db().admin().listDatabases()
    console.log('Databases:')
    databasesList.databases.forEach(db => {
        console.log(`- ${db.name}`)
    })
}