在Mongodb集合中添加一列

// 连接到MongoDB数据库
const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb://localhost:27017/mydatabase";
const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });
client.connect(err => {
  if (err) throw err;
  
  // 选择要操作的集合
  const collection = client.db("mydatabase").collection("mycollection");

  // 使用update操作来添加一列
  collection.updateMany({}, { $set: { newColumn: "new value" } }, (err, result) => {
    if (err) throw err;
    console.log("列添加成功");
    client.close();
  });
});