var giveback = {};                                                                          
                                                                                            
// Car category                                                                             
var query = db.query("QUERY 1");
                                                                                            
query.on('row',function(row,result){                                                        
    result.addRow(row);                                                                     
});                                                                                         
                                                                                            
query.on('end',function(result){                                                            
    giveback.carCategory = result.rows;                                                     
    console.log('query 1 completed');                                                       
});                                                                             
                                                                                            
if(req.param('id_car') && isNumber(req.param('id_car')))                                    
{                                                                                           
    var query2 = db.query("QUERY 2");
                                                                                            
    query2.on('row',function(row,result){                                                   
        result.addRow(row);                                                                 
    });                                                                                     
                                                                                            
    query2.on('end',function(result){                                                       
        giveback.car = result.rows;                                                         
        console.log('query 2 completed');                                                   
    });                                                                                     
}                                                                                           
                                                                                            
db.on('drain', function() {                                                                 
    console.log(giveback.car);                                                              
});                                                                                         
                                                                                            
res.writeHead("200", {"Content-Type": "application/json"});                                 
res.end(JSON.stringify(giveback));