Question

我正在一个小型网站上工作，我有点困惑一步。我遵循一个非常简单的mvc模式，我现在有一个控制器创建一个会话数组，该数据包含表单已提交的所有发布的数据。这些数据来自几个不同的下拉框，它们都有不同的ID：

 <?php
require_once('../Model/CalculatorModel.php');
require_once('../Tool/DrawTool.php'); 

$newCalc = new ConCalc();
// instantiate drawing tool
$draw = new DrawTool();
// parse (render) appliance view
$renderedView = $draw->render('../View/calculator.php', array('calcvalues' => $newCalc->getValues()));

if(isset($_POST['btn-calcCon'])){

$_SESSION['post-data'] = $_POST;
$_SESSION['post-data']['heatingType'];
$_SESSION['post-data']['meterType'];
$_SESSION['post-data']['noBedrooms'];
$_SESSION['post-data']['houseType'];
$_SESSION['post-data']['houseAge'];


    }

echo $renderedView;

?>

我的Model类中有一个select语句，它在WHERE子句中使用这些会话变量，如下所示：

    <?php
 session_start();
require_once('../Config/config.php');

class ConCalc 
{
    public $dbconn;
    public $TypicalReading;

    public function __construct()
    {
        $database = new Database();
        $db = $database->dbConnection();
        $this->dbconn = $db;


    }

    public function getValues () {

        $stmt = $this->dbconn->prepare("SELECT Consumption FROM consumption 
            WHERE HeatingType = :heatType 
            AND MeterType = :meterType 
            AND Bedrooms = :noBeds
            AND HouseType = :house 
            AND HouseAge LIKE :age");

        $stmt->bindparam(":heatType", $_SESSION['post-data']['heatingType']);
        $stmt->bindparam(":meterType", $_SESSION['post-data']['meterType']);
        $stmt->bindparam(":noBeds", $_SESSION['post-data']['noBedrooms']);
        $stmt->bindparam(":house", $_SESSION['post-data']['houseType']);
        $stmt->bindparam(":age", $_SESSION['post-data']['houseAge']);
        $stmt->execute();
        while ($result = $stmt->fetch(PDO::FETCH_ASSOC)){
            $TypicalReading = $result['Consumption'];
            echo $TypicalReading; //used for testing
            break;
        }
    }

}


?>

我在语句上做了一个Var_Dump，它确实打印出已发布的值：

 array (size=8)
  'gasUsed' => string 'Yes' (length=3)
  'heatingType' => &string 'Electricity' (length=11)
  'meterType' => &string 'Economy 7' (length=9)
  'overnight' => string 'Yes' (length=3)
  'noBedrooms' => &string '1 or 2' (length=6)
  'houseType' => &string 'Flat' (length=4)
  'houseAge' => &string 'More than 11' (length=12)
  'btn-calcCon' => string 'Calculate' (length=9)

现在我表格的前两行如下：

HeatingType     MeterType   Bedrooms    HouseType   HouseAge              Consumption
Gas             Standard    1 or 2     Flat          Less than 11 years     5430
Gas             Standard    1 or 2     Flat          More than 11 years     7270

如果我选择气体，标准，1或2，平面，小于11，那么在表格提交后，数字5430应显示在文本框中。

我有点不确定如何返回该值。我试图回显我的$ stmt变量，但它说PHP无法回显出一个PDO对象。

任何帮助将不胜感激谢谢！

Answer 1

试试这段代码：

while ($result = $stmt->fetch(PDO::FETCH_ASSOC))
  echo $result['gasUsed'].' '.$result['heatingType'] ;//...

编辑：
因此，如果您需要在结果中找到值（但我不知道为什么不使用where子句来过滤结果），请执行以下操作：

while ($result = $stmt->fetch(PDO::FETCH_ASSOC)) {
  if( $result['gasUsed'] == 'Gas' && $result['heatingType'] == 'Standard' /* ... */ ){
    $v = $result['Consumption'];
    break;
  } 
}

PHP打印SELECT语句返回的特定值

1 个答案: