基于多级过滤器Mysql + PHP优化搜索结果

时间:2011-08-03 01:06:36

标签: php mysql search filter filtering

我正在尝试创建多级搜索,以允许用户根据品牌,产品类别和价格范围优化相同的搜索(订单无关紧要)。

以下实施可能无法正常工作,因为我只提供了一种说明问题的方法。

表格: 产品

|  id  |  name  | price_id  |
|  1   |  test1 |     1     |
|  2   |  test2 |     2     |
|  3   |  test3 |     1     |

prices_ranges

|  id  |  price_from  | price_to  |
|  1   |     100      |    200    |
|  1   |     200      |    300    |

product_attributes

|  product_id  |  id_attribute  |
|      1       |        1       |
|      1       |        2       |
|      1       |        3       |
|      1       |        5       |
|      2       |        5       |
|      2       |        3       |
|      3       |        5       |

属性

|  id  |  name     |
|  1   |   attr1   |
|  2   |   attr2   |
|  3   |   attr3   |
|  4   |   attr4   |
|  5   |   attr5   |
|  6   |   attr6   |
|  7   |   attr7   |

我通过$ _GET传递url中的参数。我的多重过滤搜索代码看起来有点像这样:

//this generates the base query
$dynamicsql = get_by_filters();

//does the group by to discard duplicated products
$filtersql= $dynamicsql."group by p.id";
$query = mysql_query($filtersql) or die(mysql_error());
//the data is now ready to be presented but 
$total = mysql_num_rows($query);
for($i=0; $i<$total; $i++):
        $prods[$i] = mysql_fetch_object($query);
    endfor;

//first let's build the html code for filtering the results
list_prices_filter($dynamicsql);

//i'll only show the code for the bellow function. the above is pretty similar
list_attr_filter($dynamicsql);


//now i print the results
foreach($prods as $prod):
      //for the porpuse of this question will only print the product name
      echo $prod['pname'];
endforeach;

返回已过滤的基本查询的函数

function get_by_filters(){

        $dynamicsql = "SELECT p.name as pname,p.price_from,p.price_to,a.name,a.id FROM `products` p ";
        $dynamicsql .= "left JOIN `price_ranges` pr ON p.price_id = pr.id ";
        $dynamicsql .= "LEFT JOIN `product_attributes` pa ON w.id = pa.product_id ";
        $dynamicsql .= "LEFT JOIN `attributes` a ON a.uid = pa.id_attribute where 1=1 ";

        foreach($_GET as $parameter=>$value):
                switch($parameter):

                    case 'price':
            $dynamicsql .= " AND p.price = ".$value;
            break;

                    //filtro por zip code
                    case 'attr':
                        $dynamicsql .= " AND a.id = ".$value;
                        break;
                    default:
                        $dynamicsql .= "AND ".$parameter." = ".$value." ";
                    break;
                endswitch;
        endforeach;

        return $dynamicsql;
}

列出属性选择的功能:

function get_special_care($dynamicsql){

    $sql = "SELECT * FROM attributes a";
    $query = mysql_query($sql);
    $total = mysql_num_rows($query);

    $output = '<ul>';
    for($i=0; $i<$total;$i++):
        $result[$i] = mysql_fetch_object($query);
        $active = ($_GET['attr'] == $result[$i]->uid) ? 'active':'';

        $workerstotal = mysql_query($dynamicsql  . "  and a.id ={$result[$i]->uid} group by p.id");
        $totalworkers = mysql_num_rows($workerstotal);

        $output .= '
            <li class="'.$active.'">
                <a href="'.url_increment('attr='.$result[$i]->uid).'">'.$result[$i]->name.'<span class="totalfound">('.$totalworkers.')</span></a>
                <a title="Remove" href="'.url_decrement('attr').'" class="remove-criteria"><img src="'image_src_url" alt="Remove" /></a>
            </li>';
    endfor;

    $output .= '</ul>';
    echo $output;
}

函数url_increment()和url_decrement只是将该过滤器添加或删除到url。我没有列出它,因为我认为它与问题无关。

好介绍!!我的问题是,如果用户在第一步中选择属性5,代码会显示产品1,2和3,但我无法再次筛选属性!

在这种情况下,函数get_special_care($ dynamicsql)表示属性1,2有0个产品(产品1应该有1个)和3个(产品1和2应该是两个匹配)。

我几乎可以肯定这是因为在:

中生成基本查询的函数
case 'attr':
    $dynamicsql .= " AND a.id = ".$value;
    break;
default:

但我无法弄清楚如何解决这个问题。

此代码还有另一个问题,因为一旦您第一次选择该属性,网址就像www.teste.com/search&attr=5。在第二次点击后(假设用户点击属性1),网址将是www.teste.com/search&attr=5&attr=1这也是一个问题(我认为)

有人可以帮忙吗?我相信你们中的许多人已经实施了类似的算法,如果你能提供帮助,那将非常棒。

最后对于长篇文章感到抱歉,但我想解释一下自己,也许它可以作为未来帮助的参考......

提前致谢!!

2 个答案:

答案 0 :(得分:1)

我到目前为止唯一可以发现的错误是

 case 'price': $dynamicsql .= " AND p.price = ".$value;

p.price请参阅products.price,您的原产品表中没有价格字段。

有任何查询例外吗?

答案 1 :(得分:1)

我设法解决了这个问题如下:

创建了一个从url获取所有属性的函数(普通$ _GET ['name'] ony返回属性= 5,如www.test.com/?mod=search&attribute=2&attribute=5

function getFilter(){
        $query  = explode('&', $_SERVER['QUERY_STRING']);
        $params = array();
    foreach( $query as $param )
    {
      list($name, $value) = explode('=', $param);
      $params[urldecode($name)][] = urldecode($value);
    }
    return $params;

}

然后我改变了函数get_by_filters

function get_by_filters(){

    $dynamicsql = "SELECT p.name as pname,p.price_from,p.price_to,a.name,a.id FROM `products` p ";
    $dynamicsql .= "left JOIN `price_ranges` pr ON p.price_id = pr.id ";
    $dynamicsql .= "LEFT JOIN `product_attributes` pa ON w.id = pa.product_id ";
    $dynamicsql .= "LEFT JOIN `attributes` a ON a.uid = pa.id_attribute where 1=1 ";

    foreach($_GET as $parameter=>$value):
            switch($parameter):

                case 'price':
        $dynamicsql .= " AND p.price = ".$value;
        break;

                //changes here
                case 'attr':
                    $get = tools::getFilter();
            foreach ($get['attr'] as $attrs => $value) {
        $filter .= " and w.uid in (select a from `product_attributes` where attribute_id= {$value}) ";
                    }
                default:
                    $dynamicsql .= "AND ".$parameter." = ".$value." ";
                break;
            endswitch;
    endforeach;

    return $dynamicsql;
}

最后我们必须提供所有活动的属性过滤器,所以我更改了这个函数,如下所示:

function get_special_care($dynamicsql){

    $sql = "SELECT * FROM attributes a";
    $query = mysql_query($sql);
    $total = mysql_num_rows($query);

    //changes here        
    $get = tools::getFilter();

    $output = '<ul>';
    for($i=0; $i<$total;$i++):
        $result[$i] = mysql_fetch_object($query);

        //changes here
        foreach ($get['attr'] as $attr => $value) {
        $active = ($value == $result[$i]->uid) ? 'active':$active;
    }


        $workerstotal = mysql_query($dynamicsql  . "  and a.id ={$result[$i]->uid} group by p.id");
        $totalworkers = mysql_num_rows($workerstotal);

        $output .= '
            <li class="'.$active.'">
                <a href="'.url_increment('attr='.$result[$i]->uid).'">'.$result[$i]->name.'<span class="totalfound">('.$totalworkers.')</span></a>
                <a title="Remove" href="'.url_decrement('attr').'" class="remove-criteria"><img src="'image_src_url" alt="Remove" /></a>
            </li>';
    endfor;

    $output .= '</ul>';
    echo $output;
}