使用jQuery / Ajax過濾帶下拉列表的PHP SELECT查詢

Question

我正在嘗試使用jQuery / Ajax和PHP / MySQL創建過濾器。

我在HTML中有4個下拉列表選擇，我想要實現以下功能：

當Ajax成功發布數據時，我的PHP文件將檢查值是否為空，因此每個下拉列表都會在SELECT查詢中添加“ AND”語句，例如：

SELECT * from properties WHERE property_id = '$property_id' AND dropdown_value = '$dropdown_value' AND dropdown_value2 = '$dropdown_value2'

因此，我可以設置所有變量，然后只檢查發布的值是否為空，因此，如果為空，則根本不添加查詢語句。

這可能嗎？

謝謝。

編輯

當前代碼：

$statements = array();
if (isset($_POST['segmento'])) {
   $segmento_query = $_POST['segmento'];
   $statements[] = " AND property_details.segmento = '$segmento_query' "; //condition for each property
}
if (isset($_POST['cidade'])) {
   $cidade_query = $_POST['cidade'];
   $statements[] = " AND property_details.cidade = '$cidade_query' ";
}

$filtraSegmento = "SELECT * FROM properties, property_complements, property_details WHERE property_complements.imovel_id = properties.property_id AND property_details.imovel_id = properties.property_id $statements";

Answer 1

你有沒有嘗試過：

$statements = array();
if (isset($POST['param1']) {
   $param1 = $POST['param1'];
   $statements[] = " property1 = '$param1' "; //condition for each property
}
if (isset($POST['param2']) {
   $param2 = $POST['param2'];
   $statements[] = " property2 = '$param2' ";
}

//.....more.....
$sql = "SELECT * FROM tbl WHERE ". implode('AND', $statements);
//do something here

編輯 ：使用$statements作為字符串

$statements = '';
if (isset($_POST['segmento'])) {
   $segmento_query = $_POST['segmento'];
   $statements .= " AND property_details.segmento = '$segmento_query' "; //condition for each property
}
if (isset($_POST['cidade'])) {
   $cidade_query = $_POST['cidade'];
   $statements .= " AND property_details.cidade = '$cidade_query' ";
}

$filtraSegmento = "SELECT * FROM properties, property_complements, property_details WHERE property_complements.imovel_id = properties.property_id AND property_details.imovel_id = properties.property_id $statements";