請(qǐng)幫助我解決這個(gè)錯(cuò)誤，我長(zhǎng)期以來(lái)一直在努力解決它。因此，我也無(wú)法將數(shù)據(jù)添加到我的數(shù)據(jù)庫(kù)中。任何幫助將不勝感激。這是我的index.js代碼這是我的routes.js代碼const {   con,   sessionStore } = require('./config/db');exports.new = function(req, res){    message = '';   if(req.method == "POST"){      const post  = req.body;      const username= post.username;      const title= post.title;      const state= post.state;      const category= post.category;      const description= post.description;       if (!req.files)                return res.status(400).send('No files were uploaded.');         const file = req.files.uploads;        const img_name=file.name;          if(file.mimetype == "images/jpeg" ||file.mimetype == "images/png"||file.mimetype == "images/gif" ){                                               file.mv('public/imgs/uploads/'+file.name, function(err) {                                               if (err)                     return res.status(500).send(err);                        const sql = "INSERT INTO `nt_data`(`username`,`title`,`state`,`category`, `images` ,`description`) VALUES ('" + username + "','" + title + "','" + state + "','" + category + "','" + img_name + "','" + description + "')";                             const query = con.query(sql, function(err, result) {                                 res.redirect('show/'+result.insertUsername);                            });                       });          } else {            message = "This format is not allowed , please upload file with '.png','.gif','.jpg'";            res.render('new.ejs',{message: message});          }   } else {      res.render('new');   } };exports.show = function(req, res){    let message = '';    const username = req.params.username;    const sql="SELECT * FROM `nt_data` WHERE `username`='"+username+"'";     con.query(sql, function(err, result){      if(result.length <= 0)      message = "show not found!";            res.render('show.ejs',{data:result, message: message});   });};請(qǐng)幫我解決這個(gè)錯(cuò)誤，這非常重要。謝謝