Connection::createSqlHelper

protected function createSqlHelper();

/**
 * Returns database-depended SqlHelper object.
 * Creates new one on the first call per Connection object instance.
 *
 * @return MysqliSqlHelper | PgsqlSqlHelper
 */
public function getSqlHelper()
{
	if ($this->sqlHelper == null)
	{
		$this->sqlHelper = $this->createSqlHelper();
	}

	return $this->sqlHelper;
}