Php 为什么我的SQL查询没有更改我的数据库？

新的php和sql。我必须在Netbeans上运行一个本地数据库（用db浏览器创建）

我的数据库连接良好，正在返回结果。但当我通过界面编辑/更改结果时，它没有任何影响。我错过什么了吗

这是我插入新条目的代码：

    <?php

    error_reporting(E_ALL);
    ini_set('display_errors', 1);

    $pdo = new PDO('sqlite:events.db'); 

    if (isset($_POST['submit'])) {

    try {

      $sql = "INSERT INTO events (type, name) VALUES (:eventsType, :eventsName)";
      //named paramaters
      $stmt = $pdo->prepare($sql);

      $eventstype = filter_input(INPUT_POST, 'eventstype');
      $stmt->bindValue(':eventstype', $eventstype, PDO::PARAM_STR);

      $eventsName = filter_input(INPUT_POST, 'eventsName');
      $stmt->bindValue(':eventsName', $eventsName, PDO::PARAM_STR);

      //$movieRating = filter_input(INPUT_POST, 'movieRating');
      //$stmt->bindValue(':movieRating', $movieRating, PDO::PARAM_INT);

      $stmt->execute();
      $pdo = null;

      echo "<h1>Event added to database.</h1>";
      echo '<a href="index.php">Return to main menu</a>';

    } catch (PDOException $e) {
        //for development
        print "We had an error: " . $e->getMessage() . "<br/>";
        die();
    }
    ?>

    <?php } else {  ?>

    <form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
    Type: <input type="text" name="eventsType"><br>
    Name: <input type="text" name="eventsName"><br>
    //Rating: <input type="text" name="movieRating"><br>
    <input type="submit" name="submit">
    </form>

    <?php } ?>

您可能从
pdo
中得到错误

设置为抛出异常

$pdo = new PDO('sqlite:events.db',
               array(PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING));

或者

但是你注释掉了movie_id参数！？！不检查错误？愚蠢的教授把戏。更新应该抛出一个错误。。。有三个绑定占位符，但其中只有两个提供了值。删除操作也应引发错误。对bindValue的调用引用了SQL语句中不存在的绑定占位符
：eventsId
。（SQL语句中的占位符具有不同的名称。）如果要捕获来自PDO的异常，则需要使用
PDO:：ATTR_ERRORMODE
启用PDO异常。（这项作业只是让代码运行的一部分。至关重要的是学习调试程序所需的技能。）
 <?php

$pdo = new PDO('sqlite:events.db');


if (isset($_POST['submit'])) {

if ( isset($_POST['confirm']) && $_POST['confirm'] == 'yes'){
  try {
    //better, but still need to do more checking for security
    $sql = "DELETE from events WHERE id=:eventId";
    //named paramaters
    $stmt = $pdo->prepare($sql);

    $eventsId = filter_input(INPUT_POST, 'eventsId');
    $eventsId = filter_input(INPUT_POST, 'eventsId', FILTER_SANITIZE_NUMBER_INT);
    $stmt->bindValue(':eventsId', $eventsId, PDO::PARAM_INT);

    $stmt->execute();
    $pdo = null;
    echo '<h1>Film has been removed from database</h1>';
    echo '<a href="index.php">Return to main menu</a>';

  } catch (PDOException $e) {
      print "We had an error: " . $e->getMessage() . "<br/>";
      die();
  }

} else {
  echo 'You need confirm.';

}


?>



<?php } else {
  try {

    $sql = "SELECT * FROM events WHERE id=:eventsId LIMIT 1";

    //named paramaters
    $stmt = $pdo->prepare($sql);

    $id = filter_input(INPUT_GET, 'id');
    $stmt->bindValue(':eventsId', $id, PDO::PARAM_INT);

    $stmt->execute();
    $r = $stmt->fetch(PDO::FETCH_ASSOC);
    $pdo = null;

    if (!$r){
      print "No film specified to update";
      exit();
    }

  } catch (PDOException $e) {
      print "We had an error: " . $e->getMessage() . "<br/>";
      die();
  }
  ?>



  Title:<?= htmlspecialchars($r['type'])?> <br>
  Desc:<?= htmlspecialchars($r['name']); ?> <br>
  Year:<?= htmlspecialchars($r['rating']); ?> <br>




<form action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>" method="post">
<input type="text" readonly name="eventsId" value="<?= htmlspecialchars($r['id']); ?>"><br>
<input type="checkbox" name="confirm" value="yes">Yes, delete this record<br>
<input type="submit" name="submit" value="Delete record">
</form>

<?php } ?>

$pdo = new PDO('sqlite:events.db',
               array(PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING));

$stmt->execute() || die $stmt->errorInfo();