PDO更新不返回变量

-1

我正在尝试使用PDO更新我的postgres数据库中的一行。PDO更新不返回变量

表单不会将变量发送到处理程序文件。

我不确定问题出在哪里，我一直在为此奋斗了几天。

形式

//$maxContent is set and available 
//$context_number is set and available 
    echo"<form method='post' action='updateSpatialPhoto_handler.php'>"; 

    $query3 = $conn->prepare("SELECT * FROM excavation.contexts_spatial_photographs 
     WHERE contexts_spatial.area_easting = {$_SESSION['area_easting']} 
     AND contexts_spatial.area_northing = {$_SESSION['area_northing']} 
     AND contexts_spatial.context_number = {$_SESSION['context_number']}"); 

//contexts_spatial_photographs 
    $query3->execute(); 

while($r = $query3->fetch(PDO::FETCH_OBJ)) 
    { 
    // for each needed 
     echo"<input type='hidden' name='photograph_date' value='".$r->photograph_date."'>"; 
     echo"<input type='hidden' name='photograph_number' value='".$r->photograph_number."'>"; 
     echo"<input type='hidden' name='primary_shot' value='".$r->primary_shot."'>"; 

     echo"<input type='hidden' name='maxContext' value='", $maxContext,"'>"; 
    }; 

    echo"<input type='submit' value='Update Spatial Photo'>"; 
echo "</form>";

处理

<?php 
    session_start(); 

    // 
    include 'connect/connect.php'; 
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

    if (!isset($_SESSION['photograph_date'])) {$_SESSION['photograph_date'] = $_POST['photograph_date'];} 
    if (!isset($_SESSION['photograph_number'])) {$_SESSION['photograph_number'] = $_POST['photograph_number'];} 
    if (!isset($_SESSION['primary_shot'])) {$_SESSION['primary_shot'] = $_POST['primary_shot'];} 
    if (!isset($_SESSION['maxContext'])) {$_SESSION['maxContext'] = $_POST['maxContext'];} 

    if (isset($_SESSION['photograph_date'])) {$_SESSION['photograph_date'] = $_POST['photograph_date'];} 
    if (isset($_SESSION['photograph_number'])) {$_SESSION['photograph_number'] = $_POST['photograph_number'];} 
    if (isset($_SESSION['primary_shot'])) {$_SESSION['primary_shot'] = $_POST['primary_shot'];} 
    if (isset($_SESSION['maxContext'])) {$_SESSION['maxContext'] = $_POST['maxContext'];} 

    //echo "Photograph Date: "; echo $_SESSION['photograph_date']; echo "<br />"; 
    //echo "Photograph Number: "; echo $_SESSION['photograph_number']; echo "<br />"; 
    //echo "Primary Shot: "; echo $_SESSION['primary_shot']; echo "<br />"; 

try { 
    $sql3 = "UPDATE excavation.contexts_spatial_photographs SET 
     context_number = :context_number 
     WHERE contexts_spatial_photographs.area_easting = $area_easting 
     AND contexts_spatial_photographs.area_northing = $area_northing 
     AND contexts_spatial_photographs.context_number = $context_number"; 

    $stmt2 = $conn->prepare($sql3); 

    // prepare sql and bind parameters 
    $stmt2->bindParam(':context_number', $maxContext, PDO::PARAM_INT); 
    $stmt2->execute(); 

    echo "Record updated successfully in contexts spatial photographs<br />"; 

    } 
catch(PDOException $e) 
    { 
    echo "Error: " . $e->getMessage(); 
    } 

?>

来源

2017-07-14 Gary Nobles

在处理程序，您使用线条状顶部...

if (isset($_SESSION['maxContext'])) {$_SESSION['maxContext'] = $_POST['maxContext'];}

这些在会话变量中的值，，这很好。但在你的SQL -

AND contexts_spatial_photographs.context_number = $maxContext";

$ maxContext似乎并没有在任何地方设置。这可能是一样的会话变量，所以你需要

$maxContext = $_SESSION['maxContext'];

或

AND contexts_spatial_photographs.context_number = $_SESSION['maxContext']";

但如果你使用bindParam与他们的话会更好，你:context_number使用同样的方式。

来源

2017-07-14 05:43:39

对不起，应该提到，$ maxContent已经设置。未发布的变量是photograph_date，photograph_number和primary_shot。 –

只需重新读取Update语句，将包含$ maxContext作为搜索条件之一，然后将该值设置为$ maxContext。当然，这将无济于事？！ –

啊是的，很好的发现，我编辑的代码是$ context_number –

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