src/WorkerF/DB/Drivers/PDODriver.php
public function getList($field)
    {
        $this->_cols_str = ' '.self::_quote($field).' ';
        $this->_buildQuery();
        $this->_execute();

        return $this->_pdoSt->fetchAll(PDO::FETCH_COLUMN, 0);
    }
public function getList($field)
    {
        $this->_cols_str = ' '.self::_quote($field).' ';
        $this->_buildQuery();
        $this->_execute();

        return $this->_pdoSt->fetchAll(PDO::FETCH_COLUMN, 0);
    }
get field list

@param  string $field
@return  array
@throws  \PDOException