search in a local database (sql) with AS3

I've got an AS3 code that goes to a php page on a website. That php search in a database (sql) online and send results to my AS3 code.

So I've got 3 files : my project (FLA file), my php file, and my sql file.

Everything is working, but now I would like to do this operation offline (local).

How can I do ?

In my AS3 code I've got :

var urlreq = new URLRequest("http://www.****.com/****/myPHP.php"); 
urlreq.method = URLRequestMethod.POST;  
var urlVars = new URLVariables();  
urlVars.theport = "New-York"; 
urlreq.data = urlVars;  
var loader:URLLoader = new URLLoader(urlreq); 
loader.addEventListener(Event.COMPLETE, completed); 
loader.dataFormat = URLLoaderDataFormat.VARIABLES; 
loader.load(urlreq); 

In my php :

$theport = $_POST['theport']; ...

linked to a conn.php file :

$cfg_hote = 'mys****.perso'; 
$cfg_base = '******'; 
$cfg_user = '*****'; 
$cfg_password = '****rhx';

And I've got an sql file uploaded at phpmyadmin.ovh.net

So now, how can I do this operation offline (local) ?

I've tried to change

var urlreq = new URLRequest("http://www.****.com/****/myPHP.php");

to

var urlreq = new URLRequest("myPHP.php");

But it can't find the database on local (sql file);

Thx for your help

EDIT

I've tried to add that to my AS3 code :

import flash.data.SQLConnection; 
import flash.data.SQLMode; 
import flash.events.SQLErrorEvent; 
import flash.events.SQLEvent; 
import flash.filesystem.File;  
var conn:SQLConnection = new SQLConnection();  
conn.addEventListener(SQLEvent.OPEN, openHandler); 
conn.addEventListener(SQLErrorEvent.ERROR, errorHandler);  
// The database file is in the application storage directory  
var folder:File = File.applicationStorageDirectory; 
var dbFile:File = folder.resolvePath("database.sql");  
conn.openAsync(dbFile, SQLMode.UPDATE);  


function openHandler(event:SQLEvent😞void { 
trace("the database opened successfully"); 
}  


function errorHandler(event:SQLErrorEvent😞void { 
trace("Error message:", event.error.message); 
trace("Details:", event.error.details); 
} 

But it can't open the database.sql (trace output : Error #3125: Unable to open the database file)

Anyone see what i can do ?