Description:
------------
I've spent a couple days trying to figure why and no success so far:
Wrapping PDO with a Singleton or a Factory class for easy driver switching does 
not INSERT/DELETE/UPDATE on MySQL InnoDB engine. 
SELECT statements works fine and if switch to MyISAM everything works as expected.


PHP 5.3.1 up to 5.3.3 (Namespaced classes)
MySQL version 5.1 (tested on all builds)
Windows 7 and CentOS5
Apache 2.2 


Test script:
---------------
<?php
namespace Subroutine;
use FW\CFG;

class Data{
    private static $instance = NULL;
    public static $DRIVER = NULL;
    /**
     * @return PDO
     */
    public static function connect(){
        if (self::$instance === NULL):
            $username = NULL;
            $passwd = NULL;
            $options = array();
            self::$DRIVER = strtolower(CFG::key()->_DB['DRIVER']);
            switch (self::$DRIVER):
                case 'mysql':
                    $dsn = self::$DRIVER . ':host=' . CFG::key()->_DB['HOST'] . ';dbname=' . CFG::key()->_DB['SCHEMA'];
                    $username = CFG::key()->_DB['USER'];
                    $passwd = CFG::key()->_DB['PASS'];
                    $options = array( CFG::key()->_DB['OPTIONS'] );
                    break;
                //Other drivers not implemented yet
            endswitch;
           
            try{ self::$instance = new \PDO($dsn, $username, $passwd, $options);
 }
            catch(PDOException $e){
                echo $e->getMessage();
                return;
            }            
        endif;
        return self::$instance;
    }
}
?>

Expected result:
----------------
<?php
namespace Model;
use Subroutine\Data;

class MyModel{
    public function init(){
       $m =  Data::connect();
       $m->exec("INSERT INTO sessions (id, data, expires) VALUES (123,'my 
data',1234567890)");
    }
}
?>

Expects to INSERT in MySQL InnoDB engine. 

Actual result:
--------------
Does not INSERT/DELETE/UPDATE in MySQL InnoDB.