thinkphp 视图模型使用分析

<?php
/**
 * 视图模型
 *
 */
class ViewBatchModel extends ViewModel{

    public $viewFields = array(
         'Jinxiao_batch'=>array('id','orderid','proid','subid','time','productdate','intobatch','num'),
         'Jinxiao_product'=>array('id'=>'productID','default2'=>'day','default1'=>'aaa','_on'=>'Jinxiao_batch.proid=Jinxiao_product.id and Jinxiao_batch.productdate+(Jinxiao_product.default2*3600*24)<unix_timestamp(now())'),
    );

}

计算时间天， 用到mysql数据库时间戳 函数 unix_timestamp(now())