Mongodb 增删改查

const MongoClient = require('mongodb').MongoClient

const client = new MongoClient('mongodb://localhost:27017/', {useNewUrlParser: true})

client.connect(err=>{
  if (err) throw err
  const db = client.db('my_data')
  const collection = db.collection('users')

  /* 创建unique索引防止重复 */
  // collection.createIndex({'name': 1}, {unique: true})
  
  /* 增 */
  collection.insertOne({
    name: 'yokiijay',
    age: 23
  })
  collection.insertMany([
    {name: 'xiaoming', age: 18},
    {name: 'laowang', age: 30}
  ], (err, data)=>{
    if (err) throw err
    console.log( data )
  })

  /* 删 */
  collection.deleteOne({
    name: 'laowang'
  },(err,data)=>{
    if (err) throw err
  })

  /* 改 */
  collection.updateOne({name: 'xiaoming'}, {$set:{age: 22}},(err,data)=>{
    if (err) throw err
    console.log( data )
  })

  /* 查 */
  collection.findOne({
    name: 'yokiijay'
  }).then(data=>{
    console.log( data )
  })

  client.close()
})