var mysql = require('mysql');

var connection = mysql.createConnection({
    host: "",
    port: ,
    user: "",
    password: "",
    database: ""
});

user.on('returnCars', function(gps, radius){
     sqlQuery(GET * FROM 'cars' WITHIN RADIUS OF radius, function (){//Just psuedo code
         user.emit('returnCars', results);
     });
});