SqlHelper::convertToDb

public function convertToDb($value, ORMFieldsIReadable $field = null)
{
	if ($value === null)
	{
		return "NULL";
	}

	if ($value instanceof SqlExpression)
	{
		return $value->compile();
	}

	if($field instanceof ORMFieldsIReadable)
	{
		$result = $field->convertValueToDb($value);
	}
	else
	{
		$result = $this->convertToDbString($value);
	}

	return $result;
}