1 const mongoose=require('mongoose')
2
3 mongoose.connect("mongodb://localhost/playground",{ useNewUrlParser: true,useUnifiedTopology: true})
4 .then(()=>{console.log("数据库连接成功")})
5 .catch(err=>{console.log(err,'数据库失败')})
6
7 const courseSchema= new mongoose.Schema({
8 name:String,
9 author:String,
10 isPublished:Boolean
11 });
12 //使用规则创建集合，参数1是集合名，2是规则
13 const Course= mongoose.model("Course",courseSchema)
14 //更新一个，前为条件，后为值,若要更新一大堆数据，只更新第一个
15 Course.updateOne({name:'javascript'},{name:'java'}).then(res=>{console.log(res)})
16 //更新多个
17 Course.updateMany({},{isPublished:true}).then(res=>{console.log(res)})
