我有一个来自表中链接的表格，该表格应该只更新数据库中的一条记录。当我更改表中的一些详细信息并按下提交按钮时，它更改了数据库中的所有字段，而不仅仅是我要更改的字段。以下是我的表单代码以及正在编辑的表格。
编辑用户代码
<?php
// since this form is used multiple times in this file, I have made it a function that is easily reusable
function renderForm($userID, $username, $password, $telephone, $address1, $town, $postcode, $forename, $surname, $email, $error)
{
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Edit User</title>
</head>
<body>
<?php
// if there are any errors, display them
if ($error != '')
{
echo '<div style="padding:4px; border:1px solid red; color:red;">'.$error.'</div>';
}
?>
<form action="" method="post">
<input type="hidden" name="userID" value="<?php echo $userID; ?>"/>
<div>
<p><strong>ID:</strong> <?php echo $userID; ?></p>
<strong>Username: </strong> <input type="text" name="username" value="<?php echo $username; ?>"/><br/>
<strong>Password: </strong> <input type="text" name="password" value="<?php echo $password; ?>"/><br/>
<strong>Telephone: </strong> <input type="text" name="telephone" value="<?php echo $telephone; ?>"/><br/>
<strong>Address: </strong> <input type="text" name="address1" value="<?php echo $address1; ?>"/><br/>
<strong>Town: </strong> <input type="text" name="town" value="<?php echo $town; ?>"/><br/>
<strong>Postcode: </strong> <input type="text" name="postcode" value="<?php echo $postcode; ?>"/><br/>
<strong>Forename: </strong> <input type="text" name="forename" value="<?php echo $forename; ?>"/><br/>
<strong>Surname: </strong> <input type="text" name="surname" value="<?php echo $surname; ?>"/><br/>
<strong>Email: </strong> <input type="text" name="email" value="<?php echo $email; ?>"/><br/>
<input type="submit" name="submit" value="Edit details">
</div>
</form>
</body>
</html>
<?php
}
// connect to the database
include "config.php";
// check if the form has been submitted. If it has, process the form and save it to the database
if (isset($_POST['submit']))
{
// confirm that the 'id' value is a valid integer before getting the form data
if (is_numeric($_POST['userID']))
{
// get form data, making sure it is valid
$userID = $_POST['userID'];
$username = $_POST['username'];
$password = $_POST['password'];
$telephone = $_POST['telephone'];
$address1 = $_POST['address1'];
$town = $_POST['town'];
$postcode = $_POST['postcode'];
$forename = $_POST['forename'];
$surname = $_POST['surname'];
$email = $_POST['email'];
// check that firstname/lastname fields are both filled in
if ($username == '' || $password == '' || $telephone == '' || $address1 == '' || $town == '' || $postcode == '' || $forename == '' || $surname == '' || $email == '' )
{
// generate error message
$error = 'ERROR: Please fill in all required fields!';
//error, display form
renderForm($userID, $username, $password, $telephone, $address1, $town, $postcode, $forename, $surname, $email, $error);
}
else
{
// save the data to the database
$query = $db->prepare("UPDATE user SET username='$username', password='$password', telephone='$telephone', address1='$address1', town='$town', postcode='$postcode', forename='$forename', surname='$surname', email='$email' ");
$query->execute();
// once saved, redirect back to the view page
header("Location: view_user.php");
}
}
else
{
// if the 'id' isn't valid, display an error
echo 'Error!';
}
}
else
// if the form hasn't been submitted, get the data from the db and display the form
{
// get the 'id' value from the URL (if it exists), making sure that it is valid (checing that it is numeric/larger than 0)
if (isset($_GET['userID']) && is_numeric($_GET['userID']) && $_GET['userID'] > 0)
{
// query db
$userID = $_GET['userID'];
$query = $db->prepare("SELECT * FROM user WHERE userID=$userID");
$query->execute();
$dbRow = $query->fetch(PDO::FETCH_ASSOC);
// check that the 'id' matches up with a row in the databse
if($dbRow)
{
// get data from db
$username = $dbRow['username'];
$password = $dbRow['password'];
$telephone = $dbRow['telephone'];
$address1 = $dbRow['address1'];
$town = $dbRow['town'];
$postcode = $dbRow['postcode'];
$forename = $dbRow['forename'];
$surname = $dbRow['surname'];
$email = $dbRow['email'];
// show form
renderForm($userID, $username, $password, $telephone, $address1, $town, $postcode, $forename, $surname, $email, '');
}
else
// if no match, display result
{
echo "No results!";
}
}
else
// if the 'id' in the URL isn't valid, or if there is no 'id' value, display an error
{
echo 'Error!';
}
}
?>查看用户信息代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<link rel="icon" href="../../favicon.ico">
<title>Ballymena Sports</title>
<!-- Bootstrap core CSS -->
<link href="bootstrap.min.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="home2.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<a class="navbar-brand" href="home2_template.html">Ballymena Sports</a>
</div>
<ul class="nav navbar-nav navbar-right">
<li><a href="admin_login.php">Administrator</a></li>
<li><a href="logout.php">Log out</a></li>
</ul>
</div>
</nav>
<!-- Main part of homepage -->
<div class="jumbotron">
<div class="container">
<h2>Users</h2>
<p>This table shows all registered users of Ballymena Sports:</p>
<div class="table-responsive">
<tbody>
<?php
include "config.php";
$query = $db->prepare("SELECT * FROM user ORDER BY userID asc");
$query->execute();
echo "<table id='user' class='table table-bordered'>
<tr>
<th>User ID</th>
<th>Username</th>
<th>Forename</th>
<th>Surname</th>
<th>Email</th>
<th>Address</th>
<th>Town</th>
<th>Postcode</th>
<th>Edit User</th>
<th>Delete User</th>
</tr>";
while ($dbRow = $query->fetch(PDO::FETCH_ASSOC)) {
$userID = $dbRow['userID'];
$username = $dbRow['username'];
$forename = $dbRow['forename'];
$surname = $dbRow['surname'];
$email = $dbRow['email'];
$address1 = $dbRow['address1'];
$town = $dbRow['town'];
$postcode = $dbRow['postcode'];
// code to display information
{ echo "<tr>
<td>$userID</td>
<td>$username</td>
<td>$forename</td>
<td>$surname</td>
<td>$email</td>
<td>$address1</td>
<td>$town</td>
<td>$postcode</td>
<td><a href='edit_user.php?userID=".$userID."'>Edit</a></td>
<td><a href='delete_user.php?userID=".$userID."'>Delete</a></td>
</tr>";}
} //while
?>
</tbody>
</div>
</table>
</div>
</div>
<?php
if(!$_SESSION['admin_username']){
header('location:admin_login.php');
$name = $_SESSION['admin_username'];
}
?>
<hr>
<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="../../dist/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="../../assets/js/ie10-viewport-bug-workaround.js"></script>
<!-- Header and footer later to be used as include statements -->
</body>
</html>您的问题是您的update语句未指定where子句：
$query = $db->prepare("UPDATE user SET username='$username', password='$password', telephone='$telephone', address1='$address1', town='$town', postcode='$postcode', forename='$forename', surname='$surname', email='$email' ");
您需要使用用户ID来指定您只想更新该特定用户的行：
$query = $db->prepare("UPDATE user SET username='$username', password='$password', telephone='$telephone', address1='$address1', town='$town', postcode='$postcode', forename='$forename', surname='$surname', email='$email' where userId=$userID");
您还应该研究使用准备好的语句来保护您的代码免受SQL注入攻击。
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