刷新页面时如何重新加载mysql表

我有一个简单的代码,当我在浏览器上运行它时,第一次加载mysql表,之后当我刷新页面时,它不会加载,直到我终止进程并重新运行它。我该怎么做?

它只显示一次,之后当我刷新页面时,它不会更新

const http = require('http');
const mysql = require('mysql');

const pool = mysql.createPool({
  host: 'localhost',
  user: 'root',
  password: '',
  database: 'alerts',
  charset: 'utf8'
});


var reo ='<html><head><title>POWER CUT ALERT</title></head><body><h1>POWER CUT ALERT</h1>{${table}}</body></html>';


function setResHtml(sql, cb){
  pool.getConnection((err, con)=>{
    if(err) throw err;

    con.query(sql, (err, res, cols)=>{
      if(err) throw err;

      var table =''; //to store html table

      //create html table with data from res.
      for(var i=0; i<res.length; i++){
        table +='<tr><td>'+ (i+1) +'</td><td>'+ res[i].timestamp +'</td><td>'+ res[i].device_id +'</td></tr>';
      }
      table ='<table border="1"><tr><th>Nr.</th><th>Timestamp</th><th>IMEI NO</th></tr>'+ table +'</table>';

      con.release(); //Done with mysql connection
      con.destroy();

      return cb(table);
    });
  });
}

let sql ='SELECT * from alerts';

const server = http.createServer((req, res)=>{
  setResHtml(sql, resql=>{
    reo = reo.replace('{${table}}', resql);
    res.writeHead(200, {'Content-Type':'text/html; charset=utf-8'});
    res.write(reo, 'utf-8');
    res.end();
  });
});



server.listen(8080, ()=>{
  console.log('Server running at //localhost:8080/');
});