如何使用Node.js，Express.js從MongoDB中獲取數據

Question

這是我的代碼文件名Student.js

var mongoose = require('mongoose');

var studentSchema = new mongoose.Schema({

    name:{
        type: String,
        required: true
    },
    rollno:{
        type: Number,
        required: true
    },
    grade:{
        type: String,
        required: true
    },
    result:{
        type: String,
        required: true
    }
});


var Student = module.exports = mongoose.model('Student',studentSchema);


module.exports.getStudents = function (callback){

    Student.find(callback);
}

**filename app.js**

var express = require('express');

var app = express();

var mongoose = require('mongoose');

var PORT= process.env.PORT || 3000;


Student = require('./models/student');


mongoose.connect('mongodb://localhost/register');

var db= mongoose.connection;

app.get('/api/student', function (req,res){

    Student.getStudents(function (err, student){
        if(err){
            throw err;
        }
        res.json(student);
    });
});


app.listen(PORT);

console.log('Running app on port:' + PORT);

Answer 1

如果您有要使用Mongoose查詢的現有集合，則應將該集合的名稱明確傳遞給架構：

var studentSchema = new mongoose.Schema({ ... }, { collection : 'student' });

如果您不這樣做，Mongoose將通過簡化模型名稱並將其復數形式為您生成一個集合名稱（因此模型Student文檔將存儲在名為students的集合中；請注意-s ）。

更多文檔在這里 。