/**
* Returns a single column from the next row of a result set.
*
* @param integer $columnIndex 0-indexed number of the column you wish to retrieve from the row. If no
* value is supplied, PDOStatement->fetchColumn()
* fetches the first column.
*
* @return string A single column in the next row of a result set.
*/
public function fetchColumn($columnIndex = 0)
{
return $this->statement->fetchColumn($columnIndex);
}