public function readColumn($columnIndex)
    {
        $this->next();
        if (!$this->valid()) {
            return false;
        }
        return $this->_command->fetchResultsRow($this->_row, CommandInterface::FETCH_FIELD, CommandInterface::FETCH_MODE_ASSOC, $columnIndex);
    }
public function readColumn($columnIndex)
    {
        $this->next();
        if (!$this->valid()) {
            return false;
        }
        return $this->_command->fetchResultsRow($this->_row, CommandInterface::FETCH_FIELD, CommandInterface::FETCH_MODE_ASSOC, $columnIndex);
    }
public function readColumn ( $ columnIndex ) { $ this -> next ( ) ; if ( ! $ this -> valid ( ) ) { return false ; } return $ this -> _command -> fetchResultsRow ( $ this -> _row , CommandInterface :: FETCH_FIELD , CommandInterface :: FETCH_MODE_ASSOC , $ columnIndex ) ; }
Returns a single column from the next row of a result set.
@param int $columnIndex zero-based column index
@return mixed the column of the current row, false if no more rows available
Returns a single column from the next row of a result set .