[Maxandmov]

Код:

stock VEHICLEFROMDB(dbid)
{
    for(new i = 1; i <= GetVehiclePoolSize(); i++)
	{
	    if(vDBID[i] == dbid) return i;
	}
	return 0;
}

As far as I see you return first vehicle you find.
I had rather do it somehow like that (I might be wrong in what I coded, but I hope you get the general idea)

Код:

function DespawnPlayerVehicle(playerid)
{
	new gQuery[85];
    mysql_format(handle, gQuery, sizeof(gQuery),  "SELECT * FROM `personalcars` WHERE `Owner` = '%s'", GetName(playerid));
    new Cache:r = mysql_query(handle, gQuery);
    for(new i; i < cache_num_rows(); i++)
	{
	    new dbid = cache_get_value_name_int(i, "ID", CarInfo[playerid][pcID]);
   		for(new i = 1; i <= GetVehiclePoolSize(); i++)
	        {
	            if(vDBID[i] == dbid)
                    {
   		         if(PCarID)
   		         {
			    CarInfo[vDBID[PCarID]][pcStatus] = 0;
			    pcUpdate(vDBID[PCarID], pcStatus);

			    DestroyVehicle(PCarID);
			    vDBID[PCarID] = 0;
                          }
                    }
   		}
 	}
 	cache_delete®;
}

I mean, I have to cycle through every entry there. This stock, VehicleFromDB, returns first entry which fulfills the requirement, which means it's not quite suitable for your task.