thinkPHP链表查询
$map = ['a.cid' => input('get.id')];
$goodsList = Db::table('goods')
->alias('a') //goods 表别名
->join('brand b','a.bid=b.id') // 连上brand表设置别名b 还有查询条件
->field('a.*,b.name brandname') // 获取goods表所有字段以及b表的name字段设置别名brandname
->where($map)
->paginate(3);
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