TP5 查询=空(mysql数据库数据保存两种空值 ='' or =null)

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mysql数据库数据保存两种空值

='' or =null

如何取到两种空值的记录

->where("url is null or url=''")

例子：

		$where = new Where;
		$where['pid'] = 494;//应用中心 栏目ID
		$where['deleted'] = 0;//状态 0正常 1回收站
		$where['hide'] = 1;//显示是否 0显示 1隐藏

        $rs=Db::name('column')
        ->field('id,icon,position,level,title,hide,url,controller,sort,pid,pid_all,spread,state,description')
        ->where($where)
        ->where("url is null or url=''")
        ->order('sort desc,id desc')
        ->paginate($limit,false,['query' => request()->param()]);
		$page = $rs->render();
		$this->assign('page', $page);
		$this->assign('rs',$rs);