mongoose的基本操作方法

mongoose

1. const mongoose = require("mongoose");导入mongoose模块

2. //注意url地址最后面的地址是数据库的名称

    const url = "mongodb://127.0.0.1:27017/bk1824";

3. mongoose.connect(url,(err)=>{

if(err){

    console.log("链接失败")

}else{

    console.log("链接成功")

        }

    })

4.

//存

const User = mongoose.model("user",{

    username:String,

    password:String

})

5. //增数据

const user = new User({

    username:"zhao1234",

    password:"12345"

})

6. //将增加的数据存入数据库的表中

    user.save().then((res)=>{

        console.log(res)

    })

7. // 删除数据

User.remove({username:"zhao1234"}).then((res)=>{

     console.log(res)

})

8. //改数据

User.update({username:"1111"},{$set:{username:"zhao"}}).then((res)=>{

    console.log(res);

})

9.. // 查数据

User.find({username:"zhao"}).then((res)=>{

    console.log(res);

})