public function free()
{
if ($this->_preparedCreateStms) {
$this->_preparedCreateStms->closeCursor();
$this->_preparedCreateStms = null;
}
if ($this->_preparedFindStm) {
$this->_preparedFindStm->closeCursor();
$this->_preparedFindStm = null;
}
foreach ($this->_preparedFindStms as &$stm) {
$stm->closeCursor();
$stm = null;
}
}