如何使用php和mysql简化搜索和过滤条件

Question

我正在开发一个电子商务Web应用程序。在这我正在使用过滤器选项来搜索各种产品。

正在使用的过滤器选项是store, price, discount, color, size。

对于那个用于if else的条件并在数据库中搜索它。

我的代码，

if($_GET["cid"] != null or $_GET["size"] != null or $_GET["dis"] != null or $_GET["prf"] != null or $_GET["prt"] != null or $_GET["store"] != null or $_GET["cat"] != null or $_GET["sub"] != null or $_GET["brand"] != null) { 
     $query = null; 
     $query_w = null; 
     $query .= 'SELECT * FROM tbl_products a INNER JOIN tbl_product_category c ON c.product_category_id = a.product_category_id LEFT JOIN tbl_product_sec_category sc ON sc.product_sec_category_id = a.product_sec_category_id LEFT JOIN tbl_product_subcategory s ON s.product_subcategory_id = a.product_subcategory_id LEFT JOIN tbl_product_brand b ON b.product_brand_id = a.product_brand_id'; 

     if($_GET["cat"] != null) 
      $query_w .= ' a.product_sec_category_id = "'.$_GET["cat"].'"'; 
     if($_GET["sub"] != null) 
      $query_w .= ' a.product_subcategory_id = "'.$_GET["sub"].'"'; 
     if($_GET["brand"] != null) 
      $query_w .= ' a.product_brand_id = "'.$brand.'"'; 
     if($_GET["cid"] != null) { 
      $query .= ' INNER JOIN tbl_fa_api_color ac ON ac.api_product_id = a.api_product_id INNER JOIN tbl_product_color pc ON pc.product_color_id = ac.product_color_id'; 
      $query_w .= ' AND ac.product_color_id = "'.$_GET["cid"].'"'; 
     } 
     if($_GET["size"] != null) { 
      $query .= ' INNER JOIN tbl_fa_api_size ac ON ac.api_product_id = a.api_product_id'; 
      $query_w .= ' AND ac.api_size_size = "'.$_GET["size"].'"'; 
     } 
     if($_GET["dis"] != null) 
      $query_w .= ' AND (a.api_discount BETWEEN "'.$_GET["dis"].'" AND "99")'; 
     if($_GET["prf"] != null and $_GET["prt"] != null) 
      $query_w .= ' AND (a.api_retail BETWEEN "'.$_GET["prf"].'" AND "'.$_GET["prt"].'")'; 
     if($_GET["store"] != null) { 
      if($_GET["store"] == 'a') 
       $query_w .= ' AND a.api_type = "One"'; 
      else if($_GET["store"] == 'f') 
       $query_w .= ' AND a.api_type = "Two"'; 
      else if($_GET["store"] == 'af' or $_GET["store"] == 'fa') 
       $query_w .= ' AND (a.api_type = "One" OR a.api_type = "Two")'; 
     } 

     $query_w .= ' AND a.api_status = 1 ORDER BY a.api_id DESC LIMIT 0,6'; 

     echo $query. " WHERE".$query_w; 
    } 

$_GET["cid"]是color，$_GET["dis"]是discount，$_GET["prf"]是price from，$_GET["prt"]是price to，$_GET["cat"]是category，$_GET["sub"]是subcategory

在上面的代码正在使用级联到得到mysql query。但我的代码不正确。该mysql query is wrong。

例如，

$_GET["cid"] = 1和$_GET["dis"] = 12当前mysql query是

SELECT * FROM tbl_products a INNER JOIN tbl_product_category c ON c.product_category_id = a.product_category_id LEFT JOIN tbl_product_sec_category sc ON sc.product_sec_category_id = a.product_sec_category_id LEFT JOIN tbl_product_subcategory s ON s.product_subcategory_id = a.product_subcategory_id LEFT JOIN tbl_product_brand b ON b.product_brand_id = a.product_brand_id INNER JOIN tbl_fa_api_color ac ON ac.api_product_id = a.api_product_id INNER JOIN tbl_product_color pc ON pc.product_color_id = ac.product_color_id WHERE and ac.product_color_id = "1" AND (a.api_discount BETWEEN "12" AND "99") AND a.api_status = 1 ORDER BY a.api_id DESC limit 0, 6

在上面的代码是错误的。

如何正确使用mysql query使用串联。

还是有什么办法可以简化我的if else condition。我被困在这里。谢谢。

Answer 1

你可以像这样做条件。但是，我们建议您应该使用PDO或mysqli来更安全地运行此查询。

if($_GET["cid"] != null or $_GET["size"] != null or $_GET["dis"] != null or $_GET["prf"] != null or $_GET["prt"] != null or $_GET["store"] != null or $_GET["cat"] != null or $_GET["sub"] != null or $_GET["brand"] != null) { 
$condition = array();$query_w = ''; 
$query = 'SELECT * FROM tbl_products a INNER JOIN tbl_product_category c ON c.product_category_id = a.product_category_id LEFT JOIN tbl_product_sec_category sc ON sc.product_sec_category_id = a.product_sec_category_id LEFT JOIN tbl_product_subcategory s ON s.product_subcategory_id = a.product_subcategory_id LEFT JOIN tbl_product_brand b ON b.product_brand_id = a.product_brand_id'; 

if($_GET["cat"] != null) 
    $condition[] = 'a.product_sec_category_id = "'.$_GET["cat"].'"'; 
if($_GET["sub"] != null) 
    $condition[] = 'a.product_subcategory_id = "'.$_GET["sub"].'"'; 
if($_GET["brand"] != null) 
    $condition[] = 'a.product_brand_id = "'.$brand.'"'; 
if($_GET["cid"] != null) { 
    $query .= ' INNER JOIN tbl_fa_api_color ac ON ac.api_product_id = a.api_product_id INNER JOIN sh17n_product_color pc ON pc.product_color_id = ac.product_color_id'; 
    $condition[] = 'ac.product_color_id = "'.$_GET["cid"].'"'; 
} 
if($_GET["size"] != null) { 
    $query .= ' INNER JOIN tbl_fa_api_size ac ON ac.api_product_id = a.api_product_id'; 
    $condition[] = 'ac.api_size_size = "'.$_GET["size"].'"'; 
} 
if($_GET["dis"] != null) 
    $condition[] = '(a.api_discount BETWEEN "'.$_GET["dis"].'" AND "99")'; 
if($_GET["prf"] != null and $_GET["prt"] != null) 
    $condition[] = '(a.api_retail BETWEEN "'.$_GET["prf"].'" AND "'.$_GET["prt"].'")'; 
if($_GET["store"] != null) { 
    if($_GET["store"] == 'a') 
     $condition[] = 'a.api_type = "One"'; 
    else if($_GET["store"] == 'f') 
     $condition[] = 'a.api_type = "Two"'; 
    else if($_GET["store"] == 'af' or $_GET["store"] == 'fa') 
     $condition[] = '(a.api_type = "One" OR a.api_type = "Two")'; 
} 

if(!empty($condition)){ 
    $query_w = implode(' AND ', $condition); 
} 

if($query_w != '') 
    $query_w .= ' AND a.api_status = 1 ORDER BY a.api_id DESC LIMIT 0,6'; 
else 
    $query_w = 'a.api_status = 1 ORDER BY a.api_id DESC LIMIT 0,6'; 

echo $query. " WHERE ".$query_w; 
}