XP System using MySQL

var con = mysql.createConnection({ //creating a connection
  host: "localhost", //localhost means your ip
  user: "root", // root is default username for mysql
  password: "", // Your own password that you select in the mysql installer
  database: "xrokz" // database that i created in the bigging: CREATE DATABASE {any name};
});
///////////////
//MySQL download in the description
//commands in mysql command line:
//CREATE DATABASE xrokz;
//USE xrokz;
//CREATE TABLE userDI (userID varchar(30) NOT NULL, userXP INT NOT NULL);
///////////////
con.connect(e => {
  if(e) return;
  console.log("CONNECTED");
});

function xp() {
  return Math.floor(Math.random() * (30 - 20 + 1) + 20);
}

client.on('message', message => {
  con.query('SELECT * FROM userDI', (e, rows) => {
    if(e) return;
    let sql;
    if(!rows || !rows[0] || rows.length < 1) { // if user dont have any previous xp do this
      sql = `INSERT INTO userDI (userID, userXP) VALUES ('${message.author.id}', ${xp()})`
      console.log("VALUES ADDED");
    } else { // if he has do this
      let pxp = rows[0].userXP
      sql = `UPDATE userDI SET userXP = ${pxp + xp()} WHERE userID = '${message.author.id}'` //did you see any thing ? lol
      console.log("VALUES ADDED");
    }
    con.query(sql); //lol
      });
    //now im gonna create a xp command to see my xp


});// lagging ._.

client.on('message', message => {
  let id = message.content.split(" ").slice(1).join(" ");
  let men = message.mentions.users.first() || message.author;
  if(message.content.startsWith('-xp')) {
    con.query(`SELECT * FROM userDI WHERE userID = '${men.id}'`, (err, rows) => { // dont switch between them err first !
      if(err) return;
      if(!rows[0]) return message.channel.send("There is no details on record");
      let xt = rows[0].userXP
    message.channel.send(`${men.username} xp is ${xt}`);
  });
}
})//im gonna kill my self
// to be honest i got rid from these errors so i use google i fixed it
//Credits for xRokz & codes server
//you gonna find the code in description below.