我正在尝试根据用户的标准编写产品页面。默认情况下会传递以下字段:
上面给出了返回值。
接下来的几个字段是可选的,并根据类别通过jQuery添加:
根据类别,可能会有其他属性(如移动交易有服务提供商,制造商),这些属性将在前端动态显示。从这里,客户可以通过复选框选择他们感兴趣的制造商和服务提供商。
我的表包含:
所以到目前为止,我在数据库中有几个产品,每个产品都链接到一个类别,并根据链接到该类别的属性,每个产品都会为每个属性选项选择一个值。如果有2个属性(制造商,移动网络),则每个产品在deal_attribute_values中都有一个值,用于链接deal_id,attribute_id和所选值(因此产品可能是三星制造商和沃达丰作为服务提供商)。
我现在要做的是基于搜索查询,根据前端过滤返回关联的行。一旦前端的表单发生变化,它将序列化表单的值,并通过ajax根据这些查询返回正确的产品。
除了attribute_values之外,我的工作正常。我怀疑它与查询中的IN()子句有关,但希望有人可以帮助我解决我做错的事情。
以下是模型方法:
public function getDeals() {
$select = array();
$tables = array();
$where = array();
$values = array();
// Default to get all deal rows:
$select[] = "`deals`.*";
$tables[] = "`deals`";
// Get the category Name AND ID
$select[] = "`deal_categories`.`name` AS `catName`";
$tables[] = "`deal_categories`";
$where[] = "`deals`.`deal_category_id`=`deal_categories`.`id`";
// Look if a category was selected:
$cat = $_POST['category'];
if ($cat != "") {
$where[] = "`deals`.`deal_category_id`=?";
$values[] = $cat;
}
// Assign a query of the deal by string:
if ($_POST['searchDeals'] != "") {
$where[] = "CONCAT_WS(' ',`deals`.`name`,`deals`.`description`) LIKE ?";
$values[] = "%" . str_replace(" ", "%", htmlspecialchars($_POST['searchDeals'])) . "%";
}
// Process Min / Max PRicing:
if (isset($_POST['minPrice'])) {
$minPrice = intval($_POST['minPrice']);
$where[] = "`deals`.`price` >= ?";
$values[] = $minPrice;
}
if (isset($_POST['maxPrice'])) {
$maxPrice = intval($_POST['maxPrice']);
$where[] = "`deals`.`price` <= ?";
$values[] = $maxPrice;
}
// PRocess the min/max dates:
if (isset($_POST['minDate'])) {
$minDate = $_POST['minDate'];
$where[] = "`deals`.`start_date` >= ?";
$values[] = $minDate;
}
if (isset($_POST['maxDate'])) {
$maxDate = $_POST['maxDate'];
$where[] = "`deals`.`end_date` <= ?";
$values[] = $maxDate;
}
if (isset($_POST['attr']) && valid_array($_POST['attr'])) {
$tables[] = "`deal_attribute_values`";
foreach ($_POST['attr'] AS $attrID => $checked) {
$values[] = $attrID;
$where_condition = "`deals`.`id`=`deal_attribute_values`.`deal_id`
AND `deal_attribute_values`.`deal_attribute_id`=?
AND `deal_attribute_values`.`value` IN (";
$bind_placeholder = array();
foreach ($checked as $val) {
$bind_placeholder[] = "?";
$values[] = $val;
}
$where_condition .= implode(',', $bind_placeholder) . ")";
$where[] = $where_condition;
}
}
$sql = "SELECT " . implode(", ", $select) . " FROM " . implode(",", $tables) . " WHERE " . implode(" AND ", $where);
return $this->get($sql, $values);
}
以下是包含属性的示例POST(请注意,键3和4)表示属性集合(制造商和服务提供商)。它们的值是我们希望IN()运行的检查选项。
Array
(
[searchDeals] =>
[category] => 2
[attr] => Array
(
[3] => Array
(
[0] => 8
[1] => 9
[2] => 12
[3] => 10
)
[4] => Array
(
[0] => 4
[1] => 7
[2] => 5
)
)
[minPrice] => 100000
[maxPrice] => 9500
[minDate] => 2014-10-26 00:00:00
[maxDate] => 2014-11-30 00:00:00
)
这是基于以上输出的SQL(基于代码更新更新):
SELECT `deals`.*, `deal_categories`.`name` AS `catName` FROM `deals`,`deal_categories`,`deal_attribute_values` WHERE `deals`.`deal_category_id`=`deal_categories`.`id` AND `deals`.`deal_category_id`=? AND `deals`.`price` >= ? AND `deals`.`price` <= ? AND `deals`.`start_date` >= ? AND `deals`.`end_date` <= ? AND `deals`.`id`=`deal_attribute_values`.`deal_id` AND `deal_attribute_values`.`deal_attribute_id`=? AND `deal_attribute_values`.`value` IN (?,?,?,?) AND `deals`.`id`=`deal_attribute_values`.`deal_id` AND `deal_attribute_values`.`deal_attribute_id`=? AND `deal_attribute_values`.`value` IN (?,?,?)
以下是PDO的值:
Array
(
[0] => 2
[1] => 100000
[2] => 9500
[3] => 2014-10-26 00:00:00
[4] => 2014-11-30 00:00:00
[5] => 3
[6] => 8
[7] => 9
[8] => 12
[9] => 10
[10] => 4
[11] => 4
[12] => 7
[13] => 5
)
我可以确认在获得属性之前我会得到结果。如果我取消所有atttributes(对于制造商和服务提供商)并且仅选择1个属性,例如&#34; Apple&#34;我仍然能够获得结果。然后返回单个产品,但如果我选择关联的服务提供商,则没有结果。
基本上使用属性,如果attribute_values表中该产品的值在IN()子句的属性内,我想选择一行。由于基于类别会有多个属性,如果我将Apple,Samsung和Vodacom / MTN保留为SP,则应返回多个产品。如果产品是三星和Vodacom / MTN,它应该返回,或者如果没有选择制造商,我们只选择Vodacom / MTN作为SP,它应该返回所有MTN / Vodacom的手机。即使没有Vodacom,它至少应该返回所有MTN。
如果您需要任何其他帮助/信息,请与我们联系。我试图在这里提供尽可能多的细节,希望大家都明白:)
**答案更新**
我对Alex发布的代码进行了2次更改,这对我的结果有效!谢谢Alex:)
if (isset($_POST['attr']) && valid_array($_POST['attr'])) {
foreach ($_POST['attr'] AS $attrID => $checked) {
$current_table = "`deal_attribute_values` AS `dav" . $attrID."`";
$asName = "`dav".$attrID."`";
$values[] = $attrID;
$where_condition = "`deals`.`id`=".$asName.".`deal_id`
AND " . $asName . ".`deal_attribute_id`=?
AND " . $asName . ".`value` IN (";
$bind_placeholder = array();
foreach ($checked as $val) {
$bind_placeholder[] = "?";
$values[] = $val;
}
$where_condition .= implode(',', $bind_placeholder) . ")";
$where[] = $where_condition;
$tables[] = $current_table;
}
}
答案 0 :(得分:1)
我相信你对这个问题在IN
条款中是正确的。准备好的语句存在问题,并为IN
子句提供值。您不能将整个IN
子句条件作为一个参数传递,因为它会自动将其作为一个整体自动转义。
所以你有:
if (isset($_POST['attr']) && valid_array($_POST['attr'])) {
$tables[] = "`deal_attribute_values`";
foreach ($_POST['attr'] AS $attrID => $checked) {
$str = implode(", ", $checked);
$where[] = "`deals`.`id`=`deal_attribute_values`.`deal_id`
AND `deal_attribute_values`.`deal_attribute_id`=?
AND `deal_attribute_values`.`value` IN (?)";
$values[] = $attrID;
$values[] = $str;
}
}
将$str
参数绑定到语句时,它会将整个$str
封装在引号中,因此IN
只有一个值,而不是用逗号分隔的值。
您有两个选择:
$str
附加到查询而不绑定它?
所需的每个IN
值添加了IN
个deal_attribute_values.deal_attribute_id=?
:foreach ($_POST['attr'] AS $attrID => $checked) { $values[] = $attrID; $where_condition = "`deals`.`id`=`deal_attribute_values`.`deal_id` AND `deal_attribute_values`.`deal_attribute_id`=? AND `deal_attribute_values`.`value` IN ("; $bind_placeholder = array(); foreach($checked as $val) { $bind_placeholder[] = "?"; $values[] = $val; } $where_condition .= implode(',', $bind_placeholder).")"; $where[] = $where_condition; }
跟进回答:
您的查询中存在逻辑错误。当您引入多于1个属性类别时,以下条件deal_attribute_id
会出现两次。这意味着deal_attribute_values
必须在同一行中同时等于2个值,这是不可能的。
您必须修改查询,以便对于要添加到查询的每个属性类别/集,您必须将SELECT deals.*, deal_categories.name AS catName
FROM deals,deal_categories,deal_attribute_values, deal_attribute_values AS dav2
WHERE
deals.deal_category_id=deal_categories.id AND deals.deal_category_id=? AND deals.price >= ? AND deals.price <= ? AND deals.start_date >= ? AND deals.end_date <= ? AND
deals.id=deal_attribute_values.deal_id AND deal_
attribute_values.deal_attribute_id=? AND deal_attribute_values.value IN (?,?,?,?) AND
deals.id=dav2.deal_id AND dav2.deal_attribute_id=? AND dav2.value IN (?,?,?)
添加到联接列表中。因此,对于您的上次更新,查询应如下所示:
deal_attribute_values
请注意,我已将dav2
添加为$tables[]
,这也是为了匹配第二组属性。
对于所需的代码更改,它应该是这样的(请参阅{{1}}部分的更改):
if (isset($_POST['attr']) && valid_array($_POST['attr'])) { foreach ($_POST['attr'] AS $attrID => $checked) { current_table = "`deal_attribute_values` AS dav".$attrID; $values[] = $attrID; $where_condition = "`deals`.`id`=`".$current_table."`.`deal_id` AND `".$current_table."`.`deal_attribute_id`=? AND `".$current_table."`.`value` IN ("; $bind_placeholder = array(); foreach($checked as $val) { $bind_placeholder[] = "?"; $values[] = $val; } $where_condition .= implode(',', $bind_placeholder).")"; $where[] = $where_condition; $tables[] = $current_table; } }