批量添加

格式： 
        insert into 表(字段1,字段2) values(1,a),

        (2,b),
        (3,c);
 下面是我根据shopnc 商城给的方法写的代码：
        $result = $goods_model->save($params);
        $getId = $result;

$attr_name = '';

for($i = 0;$i<count($_POST['attrname']);$i++){

$attr_name .= "(".$getId.",".$_POST['attrid'][$i].","."'".$_POST['attrname'][$i]."'"."),";

}

$attr_name = trim($attr_name,",");

if($_POST['attrname']){

$insert = Model()->execute("INSERT INTO qqjc_goods_attr(`goods_id`,`attr_id`,`attr_value`) VALUES $attr_name");

}