DatabaseResult.php
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DatabaseResult.php
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	<?php

	namespace Keruald\Database\Result;

	use IteratorAggregate;

	/**
	* Represents a database result
	*/
	abstract class DatabaseResult implements IteratorAggregate {

	/**
	* Gets number of rows in result
	*/
	public abstract function numRows () : int;

	/**
	* Fetches a row of the result
	* @return array\|null An array if there is still a row to read; null if not.
	*/
	public abstract function fetchRow () : ?array;

	/**
	* Fetches the value from the first column of the first row in the result.
	*
	* This is typically used for queries that return a single scalar value
	* such as SELECT count(*).
	*
	* @return mixed\|null The value, or null if no more rows.
	*/
	public function fetchScalar () : mixed {
	$row = $this->fetchRow();

	if (!$row) {
	return null;
	}

	$key = array_key_first($row);
	return $row[$key];
	}
	}