ThinkPHP setfield方法的使用问题

Question

foreach ($orderGoodslist as $key => $value){
                    $goods_id['goods_id'] = $value['orderdetail_goodsid'];
                    $goods_salesvolume['goods_salesvolume'] = $value['orderdetail_goodsnum'];
                    $mGoods->where($goods_id)->setfield('goods_salesvolume','+$goods_salesvolume');


                }
                //---------------------------------------------
                
                setfield('goods_salesvolume','+$goods_salesvolume');
                我要设置goods_salesvolume字段本身在加上$goods_salesvolume 
                官方文档看不懂 希望大神能指教一下

Answer 1

如果是累加，可以使用setInc方法

$goods_salesvolume 是要对goods_salesvolume字段增加的值

 $mGoods->where($goods_id)->setDec('goods_salesvolume',$goods_salesvolume);