[英]NodeJS connection with MongoDB using Mongoose
我正在嘗試通過訪問 localhost:4000/books 在瀏覽器 URL 中查看 mongodb collections(僅供查看)
app.js 代碼:
var express = require("express");
var app = express();
var bodyParser = require("body-parser");
var mongoose = require("mongoose");
var Book = require("./book.model");
//mongo DB database connection: databse nmae is: example
var db = "mongodb://localhost:27017/example";
mongoose.connect(db, { useNewUrlParser: true, useUnifiedTopology: true });
const conSuccess = mongoose.connection
conSuccess.once('open', _ => {
console.log('Database connected:', db)
})
conSuccess.on('error', err => {
console.error('connection error:', err)
})
var port = 4000;
app.listen(port, function () {
console.log("app listening on port " + port);
});
//REST get
app.get('/', function(req,res){
res.send("happy to be here");
});
//work on here localhost:4000 works but not localhost?4000/books
//get all "books" collections
app.get('/books', function(req,res) {
console.log("get all books");
Book.find({})
exec(function(err, books){
if(err){
res.send("error has occured");
} else {
console.log(books);
res.json(books);
}
});
});
book.model.js
var mongoose = require("mongoose");
var Schema = mongoose.Schema;
var BookSchema = new Schema({
title: String,
author: String,
category: String,
});
module.exports = mongoose.model("Book", BookSchema);
和 mongodb 服務器在 cmd 屬性中啟動
運行>節點應用程序控制台顯示消息為“應用程序正在偵聽端口 4000 數據庫已連接:mongodb://localhost:27017/example”
在 URL 中,當我嘗試像這樣訪問 localhost:4000/books
顯示錯誤為
參考錯誤:未定義 exec。 為什么會這樣,請幫助解決這個問題。 我正在努力糾正這個錯誤 3 天,並在沒有繼續前進的情況下真正解決這個問題。
使用.
在exec
之前嘗試這樣
app.get('/books', function(req,res) {
console.log("get all books");
Book.find({}).exec(function(err, books){
if(err){
res.send("error has occured");
} else {
console.log(books);
res.json(books);
}
});
});
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