ThinkPHP3中Model类_before_delete方法的使用

protected function _before_delete($options){
	$articleclass_id=$options[where][articleclass_id];
	$sql="
		select *
		from `articleclass`
		where articleclass_pid=$articleclass_id
	";
	if(M()->execute($sql)){
		$this->error='请先删除该分类下子分类';
		return false;
	}
	$sql="
		select *
		from `article`
		where article_articleclass_id=$articleclass_id
	";
	if(M()->execute($sql)){
		$this->error='请先删除该分类下的文章';
		return false;
	}
}