//1. 安装 mongoose
 //2. 导入 mongoose
 const mongoose = require('mongoose');
 //3. 连接数据库                              数据库名称
 mongoose.connect('mongodb://127.0.0.1:27017/bilibili');
 //4. 设置连接回调
 //连接成功   once 一次   事件回调函数只执行一次
mongoose.connection.on('open', () => {
  console.log('连接成功');
  //5. 创建文档结构对象
    // 设置集合中 文档的属性以及属性值得类型
  let BookSchema = new mongoose.Schema({
    title: String,
    author: String,
    price: Number
  });
  //6. 创建文档模型对象  对文档操作的封装对象  mongoose会使用集合名称的复数，创建集合
  let BookModel = mongoose.model('book', BookSchema);
     //7. 插入文档
  BookModel.create({
    title: '西游记',
    author: '吴承恩',
    price: 19.9
  }, (err, data) => {
        // 判断是否有错误
    if (err) throw err;
        //输出 data 对象  如果没有出错，则输出插入后的文档对象
    console.log(data);
    //8. 断开连接  关闭数据链接 (项目运行过程中，不会添加该代码)
    mongoose.disconnect();
  });
});
//连接出错
mongoose.connection.on('error', () => {
  console.log('连接出错~~');
})
//连接关闭
mongoose.connection.on('close', () => {
  console.log('连接关闭');
})

SongModel.create({
  title:'给我一首歌的时间',
  author: 'Jay'
}, function(err, data){
  //错误
  console.log(err);
  //插入后的数据对象
  console.log(data);
});

//1.引入mongoose
const mongoose = require('mongoose');
//2.链接mongodb数据库 connect 连接
mongoose.connect('mongodb://127.0.0.1:27017/project');
//3.设置连接的回调
mongoose.connection.on('open',()=>{
  //4.声明文档结构
  const PhoneSchema = new mongoose.Schema({
    brand:String,
    color:String,
    price:Number,
    tags:Array
  })
  //6.创建模型对象
  const PhoneModel = mongoose.model('phone',PhoneSchema);
  PhoneModel.insertMany([
    {
      brand:'华为',
      color:'灰色',
      price:2399,
      tags:['电量大','屏幕大','信号好']
    },
    {
      brand:'小米',
      color:'白色',
      price:2099,
      tags:['电量大','屏幕大','信号好']
         }
  ],(err,data)=>{
    if(err) throw err;
         console.log('写入成功');
         mongoose.connection.close();
  })
})

SongModel.deleteOne({_id:'5dd65f32be6401035cb5b1ed'}, function(err){
  if(err) throw err;
  console.log('删除成功');
  mongoose.connection.close();
});

SongModel.deleteMany({author:'Jay'}, function(err){
  if(err) throw err;
  console.log('删除成功');
  mongoose.connection.close();
});

SongModel.updateOne({author: 'JJ Lin'}, {author: '林俊杰'}, function (err) {
  if(err) throw err;
  mongoose.connection.close();
});

SongModel.updateMany({author: 'Leehom Wang'}, {author: '王力宏'}, function (err) {
  if(err) throw err;
  mongoose.connection.close();
});

SongModel.findOne({author: '王力宏'}, function(err, data){
  if(err) throw err;
  console.log(data);
  mongoose.connection.close();
});
//根据 id 查询数据
SongModel.findById('5dd662b5381fc316b44ce167',function(err, data){
  if(err) throw err;
  console.log(data);
  mongoose.connection.close();
});

//不加条件查询
SongModel.find(function(err, data){
  if(err) throw err;
  console.log(data);
  mongoose.connection.close();
});
//加条件查询
SongModel.find({author: '王力宏'}, function(err, data){
  if(err) throw err;
  console.log(data);
  mongoose.connection.close();
});