Question

由于我的工作，我正在学习爬行。但是突然我开始了后端区域。（Node.js，Express，MongoDB，GraphQL）我对MonoDB中的数据更新有疑问。

我已经用“猫鼬”连接到“ mLab”。而且我已经成功连接了虚拟数据。

schema.js

const Book = require("../model/book");

// dummy data
const books = [
    {name: "Name of the Wind", genre: "Fantasy"},
    {name: "The Final Empire", genre: "Fantasy"},
    {name: "The Long Earth", genre: "Sci-Fi"},
    {name: "The Hero of Ages", genre: "Fantasy"},
    {name: "The Colour of Magic", genre: "Fantasy"},
    {name: "The Light Fantastic", genre: "Fantasy"},
    {name: "드래곤볼", genre: "Sci-Fi"}
];

Book.collection.insert(books, function (err, docs) {
    if (err){
        return console.error(err);
    } else {
        console.log("Multiple documents inserted to Collection");
    }
});

book.js

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const bookSchema = new Schema({
    name: String,
    genre: String
});

module.exports = mongoose.model("Book", bookSchema);

但是，当我在虚拟数据中添加新数据时，新数据将添加到现有数据之后。

如果我将初始值发送到空数据库，对数据进行更改时如何更新现有数据？

更新多个现有项目

0 个答案: