Question

我尝试使用表单来更新sql表，首先获取其数据（editrower.php）并将其设置为表单中的值，然后使用表单更新表（update_contactrequest.php）但它返回说划船者已更新但表格没有更新。

editrower.php

<?php
require('login.php');
?>
        <?php
        include 'php/mysql_connect.php';
        if(isset($_GET['id'])){
        $q = $db->prepare('SELECT * FROM rowercontacts WHERE id=:id LIMIT 1');
        $q->execute(array(':id'=>$_GET['id']));
        $row = $q->fetch(PDO::FETCH_ASSOC);
        if($row){
        echo '
      <form method="post" action="php/update_contactrequest.php"><div class="col-xs-9 col-md-6 col-lg-6">
        <div class="form-group">
          <input type="hidden" name="id" id="id" value="'.$_GET['id'].'">
          <label for="firstname">First Name</label>
          <input type"text" class="form-control" name="firstname" placeholder="First Name" value="'.$row['firstname'].'" />
        </div>
        <div class="form-group">
          <label for="lastname">Last Name</label>
          <input type="text" class="form-control" name="lastname" placeholder="Last Name" value="'.$row['lastname'].'" />
        </div>

        <br><br>
        <br><br>
        <input type="submit" class="btn btn-default" value="Update" />
      </div></form>
        ';
      }
      else{
      echo 'No rower found';
      }
      }
      else{
        echo 'No rower found';
      }
      ?>

update_contactrequest.php：

<?php
session_start();
if($_SESSION['loggedIn'] == true){

$rower_id= $_POST['id'];
$firstname = $_POST['firstname'];
$lastname = $_POST['lastname'];
  // connection to the database
try {
$bdd = new PDO('mysql:host=localhost;dbname=home','username','password');
} catch(Exception $e) {
exit('Unable to connect to database.');
}

// insert the records
$sql = "UPDATE rowercontacts SET firstname=:firstname, lastname=:lastname WHERE id=:rower_id";
$q = $bdd->prepare($sql);
if($q->execute(array(':firstname'=>$firstname, ':lastname'=>$lastname, ':rower_id'=>$id))){
  echo '<script type="text/javascript">alert("Rower Updated.");location.href="../rowerlist.php";</script>';
}
else{
  echo '<script type="text/javascript">alert("Something went wrong...");location.href="../rowerlist.php";</script>';
}

}
?>

Answer 1

$q->rowCount()。准备好的语句将返回受影响的行数。

如果查询本身没有错误且执行正常，则需要受影响的行。

$q = $bdd->prepare($sql);
if($q->execute(array(':firstname'=>$firstname, '...'))){
  $updRows = $q->rowCount();
  if($updRows==0){
    echo '<script type="text/javascript">alert("Affected Rows = 0 !!!");location.href="../rowerlist.php";</script>';
  }
   else{
    echo '<script type="text/javascript">alert("Rows affected : '.$updRows.'");location.href="../rowerlist.php";</script>';
  }
}
else{
  echo '<script type="text/javascript">alert("Something went wrong...");location.href="../rowerlist.php";</script>';
}

超过70％的受影响行数为0的更新查询由于WHERE不正确，其余部分来自尝试将record替换为已存在的exactly the same values。
在这种情况下，我做的第一件事是，我将查询作为可读文本显示使用$q->debugDumpParams();，您将获得该查询数组。
WHERE id = null通常不是人们所期望的。

对于您的问题我确定您可以在以下3行中找到错误的部分。： - ）

$rower_id= $_POST['id'];
....
$sql = "UPDATE rowercontacts ... WHERE id=:rower_id";
if($q->execute(array(':firstname'=>$firstname,...,':rower_id'=>$id)))

PDO说它会更新表格，但它实际上并没有

1 个答案: