PHP_SMART_HOME_V3/app/models/managers/SettingsManager.php

<?php
class SettingsManager{
	static function getAllValues () {
		return Db::loadAll ("SELECT * FROM settings");
	}

	static function getByName($settingName) {
		return Db::loadOne("SELECT * FROM settings WHERE name = ?", array($settingName));
	}

	public static function create ($name, $value) {
		$setting = array (
			'name' => $name,
			'value' => $value,
		);
		try {
			Db::add ('settings', $setting);
		} catch(PDOException $error) {
			echo $error->getMessage();
			die();
		}
	}

	public static function update ($name, $value) {
		if ($this.getByName($name)){
			$this->create($name, $value);
		} else {
			try {
				Db::edit ('settings', ['value' => $value], 'WHERE name = ?', array($name));
			} catch(PDOException $error) {
				echo $error->getMessage();
				die();
			}
		}
	}
}
?>