NodeJS MongoDB动态查找()查询

npm install mongodb

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb://localhost:27017";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

client.connect(err => {
  if (err) throw err;
  const db = client.db("your_database_name");
  const collection = db.collection("your_collection_name");

  // 动态查找条件
  const query = { key: "value" };

  collection.find(query).toArray((err, result) => {
    if (err) throw err;
    console.log(result);
    client.close();
  });
});

npm install mongoose

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/your_database_name', { useNewUrlParser: true, useUnifiedTopology: true });

const Schema = mongoose.Schema;

// 定义一个简单的模型
const MyModel = mongoose.model('MyModel', new Schema({
  key: String
}));

// 动态查找条件
const query = { key: "value" };

MyModel.find(query).exec((err, result) => {
  if (err) throw err;
  console.log(result);
});