How to query a piece of data in node.js

Node.js method to query a piece of data: 1. Create relevant js files; 2. Query a piece of data through the code "const MongodbClient = require("mongodb").MongoClient,assert = require..." Can.

The operating environment of this article: windows7 system, mongodb nodeJS driver version 3.2.3, Dell G3 computer.

node.js How to query a piece of data?

NodeJs uses mongodb to query a piece of data

源代码请查看GitHub:https://github.com/slhuang520/study/tree/master/web/nodeJS/mongoDB/findOne.js

The currently used mongodb nodeJS driver version is 3.2.3,

Different Driver versions, the methods are very different difference.

When querying a piece of data, you can also use sorting or certain conditions.

const MongodbClient = require("mongodb").MongoClient,
    assert = require("assert");
(async () => {
    const url = "mongodb://127.0.0.1:27017",
        dbName = "mydb",
        client = new MongodbClient(url);
    try {
        await client.connect();
        const db = client.db(dbName);
        let col = await db.collection("user");
        col.findOne().then(res => {
            console.log(res); //{ _id: 5ccd913ef78b417285224075, name: 'Jim', age: 12 }
        });
    } catch (e) {
        console.log(e.stack);
    } finally {
        client.close();
    }
})();

Recommended learning: "node.js video tutorial"

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