mingde-bd/application/common/model/GCart.php

<?php
namespace app\common\model;

use think\Db;

class GCart extends Base
{

    public function add($goodsId,$userId){
        $map[]=['user_id','=',$userId];
        $map[]=['goods_id','=',$goodsId];
        $goodsStock=Db::name('g_goods')->where('id',$goodsId)->value('stock');
        if($goodsStock < 1){
            $this->error='库存不足';
            return false;
        }

        $find=Db::name('g_cart')->where($map)->find();

        if($find){
            $ret=Db::name('g_cart')->where($map)->inc('nums')->update(['update_time'=>date('Y-m-d H:i:s')]);
        }else{
            $data=[
                'user_id'=>$userId,
                'goods_id'=>$goodsId,
                'nums'=>1,
                'create_time'=>date('Y-m-d H:i:s'),
            ];
            $ret=Db::name('g_cart')->insert($data);
        }
        return $ret;
    }
    public function lists($userId){
        $ret=Db::name('g_cart')
            ->alias('c')
            ->join('g_goods g','c.goods_id=g.id')
            ->field('c.id,c.nums,g.title,g.img,g.price,g.sale_price,g.type')
            ->where('c.user_id',$userId)
            ->where('g.del',0)
            ->where('g.enable',1)
            ->select();
        foreach ($ret as $k=>$v){
            if($v['type'] == 1){
                $ret[$k]['price']=$v['sale_price'];
            }
            unset($ret[$k]['sale_price']);
        }
        return $ret?$ret:[];
    }
    public function updateNum($id,$nums){
        $ret=Db::name('g_cart')->where('id',$id)->update(['nums'=>$nums]);
        return $ret;
    }
    public function del($id){
        $ret=Db::name('g_cart')->delete($id);
        return $ret;
    }

}