mytinytodo/src/includes/class.dbcore.php

<?php

// FIXME: experimental, subject to change

class DBCore
{
	/** @var Database_Abstract $db */
	protected $db;

	/** @var DBCore $defaultdb */
	protected static $defaultInstance;

	/**
	 *
	 * @param Database_Abstract $db Value of DBConnection::instance() or similar
	 * @return void
	 */
	public function __construct(Database_Abstract $db) {
		$this->db = $db;
	}

	/**
	 *
	 * @return Database_Abstract
	 * @throws Exception
	 */
	public function connection()
	{
		if (!isset($this->db)) {
			throw new Exception("DBConnection is not set");
		}
		return $this->db;
	}

	/**
	 *
	 * @return DBCore
	 * @throws Exception
	 */
	public static function defaultInstance() : DBCore
	{
        if (!isset(self::$defaultInstance)) {
			throw new Exception("DBCore defaultInstance is not initialized");
        }
		return self::$defaultInstance;
	}

	/**
	 *
	 * @param DBCore $instance
	 * @return void
	 */
	public static function setDefaultInstance(DBCore $instance)
	{
		self::$defaultInstance = $instance;
	}

	/**
	 *
	 * @param int $id
	 * @return int
	 */
	public function getListIdByTaskId(int $id): int
	{
		$db = $this->db;
		$listId = (int)$db->sq("SELECT list_id FROM {$db->prefix}todolist WHERE id=". (int)$id);
		return $listId;
	}

}