Mesh::checkItemLinked

static function checkItemLinked($id)
{
	global $DB;

	$id = Assert::expectIntegerPositive($id, '$id');

	$directCN = 	static::getDIRECTColumnName();
	$idCN = 		static::getIDColumnName();
	$parentCN = 	static::getPARENTIDColumnName();

	$item = $DB->query("
		select 
			1 
			from 
				".static::getTableName()."
			where 
				(".$directCN." = '1' and ".$idCN." = '".$id."')
				or
				(".$directCN." = '1' and ".$parentCN." = '".$id."')
	")->fetch();

	return !empty($item);
}