Question

我正在输入一个csv文件。由于输入形式为array，因此我将其转换为对象，然后再将其插入mongo数据库。即使数据库已连接（根据终端），也未创建集合，因此也未插入数据。任何帮助表示赞赏。谢谢。

The structure of the files

-- Index.js --

const express = require('express');
const path = require('path');
const mongoose = require('mongoose');
const mongoclient = require('mongodb').MongoClient;
const app = express();

// import the routes
const upload_file = require('./routes/route');
// Use middleware 
app.use('/upload',upload_file);
app.use(express.static(__dirname));


app.get('/upload',(req,res)=>{
    res.sendFile(path.join(__dirname+'/html/main.html'));
});


// Connect to the database

mongoclient.connect('mongodb://127.0.0.1:27017/',{ useNewUrlParser: true ,useUnifiedTopology: true},(error)=>{
    if(error){
        console.log('Error in connecting to the database - ',error);
    }else{
        console.log('Connected to database');
        app.listen(8080,()=>{
            console.log('Server listening at 8080');
        });

    }
});

------------------------------------------------------------

-- Schema.js --

//Schema for the MongoDB collection

const mongoose = require('mongoose');

const csv_schema = mongoose.Schema({
    Name:{
        type: String,
        required: true
    },

    RegNo:{
        type: String,
        required: true
    },

    Subject:{
        type: String,
        required: true
    },

    Mark:{
        type: String,
        required: true
    }
});

module.exports = mongoose.model('student',csv_schema);

------------------------------------------------------------

-- Route.js --
// Accpets the post request

const express = require('express');
const router = express.Router();
const multer = require('multer'); 
const upload = multer({dest: '../temp/csv'});  
const csv = require('fast-csv');

const student = require('../models/schema');

router.post('/',upload.single('file'),(req,res)=>{

    csv.parseFile(req.file.path).on('data',(data)=>{
        // Converting the array input to object type
        let object = Object.assign({},data);
        var student_object = {
            Name: object[0],
            RegNo: object[1],
            Subject: object[2],
            Mark: object[3]
        };

        student.insert(student_object,(err, data)=>{
            console.log(data);
            if(err)
            console.error("Err: ",err);
            else
            console.log("Successfully created");
        });

    });
});

// To check whether the data was inserted successfully
router.get('/data',async (req,res)=>{
    const data = await student.find();
    console.log(data);
});

module.exports = router;

<!DOCTYPE html>
<html>
    <head>
        <title>CSV upload page</title>
    </head>

    <body>
        <form action="/upload" method="POST" enctype="multipart/form-data">
            <input type="file" name="file">
            <button type="submit"></button>
        </form>
    </body>
</html>

没有创建集合，也没有在MongoDb中插入记录

0 个答案: