core-bundle/src/Resources/contao/library/Contao/Model.php
public function refresh()
	{
		$intPk = $this->{static::$strPk};

		// Track primary key changes
		if (isset($this->arrModified[static::$strPk]))
		{
			$intPk = $this->arrModified[static::$strPk];
		}

		// Reload the database record
		$res = Database::getInstance()->prepare("SELECT * FROM " . static::$strTable . " WHERE " . Database::quoteIdentifier(static::$strPk) . "=?")
									   ->execute($intPk);

		$this->setRow($res->row());
	}
public function refresh()
	{
		$intPk = $this->{static::$strPk};

		// Track primary key changes
		if (isset($this->arrModified[static::$strPk]))
		{
			$intPk = $this->arrModified[static::$strPk];
		}

		// Reload the database record
		$res = Database::getInstance()->prepare("SELECT * FROM " . static::$strTable . " WHERE " . Database::quoteIdentifier(static::$strPk) . "=?")
									   ->execute($intPk);

		$this->setRow($res->row());
	}
Reload the data from the database discarding all modifications