node连接mongoDB6.0.5

1. 实列化mongo连接

    const { MongoClient } = require("mongodb");
    const url = "mongodb://localhost:27017";
    const client = new MongoClient(url);

2. 定义连接方法

    async function main() {
      // 连接db
      await client.connect();
      // 获取Database
      const db = client.db(dbName);
      // 获取collection
      const collection = db.collection("users");
    }
    

3.操作数据库（拿到collection后）

      //查看所有
      const findResult = await collection.find({}).toArray();
      console.log("Found documents =>", findResult);
      //批量插入数据
      const insertResult = await collection.insertMany([{ name: "Mr.zhang", age: 26, sex: "男" }]);
      console.log("Inserted documents =>", insertResult);
      //查找符合name="Mr.zhang"条件的数据
      const filteredDocs = await collection.find({ name: "Mr.zhang" }).toArray();
      console.log("Found documents filtered by { a: 3 } =>", filteredDocs);
      //更新name="lisi"的age数据
      const updateResult = await collection.updateOne({ name: "lisi" }, { $set: { age: 2 } });
      console.log("Updated documents =>", updateResult);
      //批量删除
      const deleteResult = await collection.deleteMany({ name: "Mr.zhang" });
      console.log("Deleted documents =>", deleteResult);
      //创建name为下标1
      const indexName = await collection.createIndex({ name: 1 });
      console.log("index name =", indexName);

4. 调用

    main()
      .then(console.log)
      .catch(console.error)
      .finally(() => client.close());