SQLGlobal::buildColumn PHP Method

    protected function buildColumn()
    {
        $sql =& $this->_sql;
        $columns =& $this->columns;
        if (count($columns) > 0) {
            $selectStr = implode($columns, ',');
            $sql[] = " {$selectStr} ";
        } else {
            $sql[] = "*";
        }
    }