默认地址未设置如何重新设置

//统计默认地址状态没有设置的用户的数量
 $address_sql = "select lender_id,count(*) as count from address where is_default=0 and status=0 group by lender_id  having count>=1 limit $offset,$limit";
    foreach($address_data as $k=>$val){

$sql = "select is_default from address where lender_id=".$val['lender_id'];
     $address_arr = $db_other->execute($sql);
     $defaults = array();
     foreach ($address_arr as $value){
     $defaults[] = $value['is_default'];
     }
     //判断是否已经设置默认地址
     if(in_array(1, $defaults)){
     continue;
     }else{
       //获取最新添加的一条并更新会默认地址
     $newsql = "select id from address where lender_id=".$val['lender_id']." order by id desc limit 1 ";
     $address_info = $db_other->execute($newsql);
     if(!empty($address_info)){
     $db_other->execute("update address set is_default= 1 where id=".$address_info[0]['id']);
     }
     }
     }