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php - 通过HTML表单使用bindParam对数据库执行PDO

转载 作者:行者123 更新时间:2023-11-29 06:35:10 28 4
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我想要实现的目标

我正在尝试使用用户在表单中填写的值来更新我的数据库。

我已经花了几个月的时间进行无休止的 Google 搜索,避免向 StackOverflow 提出问题,每个网站都教会了我一些东西,但我还没能完成这个产品。

我正在努力解决的问题

提交后,PDO::execute 不会执行,数据库也不会更新。之前我收到了“未定义索引” 的错误,但这些错误已通过正确传递变量得到解决。现在我没有收到任何错误。

我的问题

我做错了什么?考虑到我在控制台或任何地方都没有收到任何错误(并且 error_reporting 已打开)。我检查它是否已执行的 if 语句总是给出 nope,因此查询中的某个地方失败了。

另外我怎样才能更好地调试它?

我尝试过的(代码已缩小以显示相关内容)

index.php(显示带有更新按钮的表格,将我重定向到 update.php)

<?php
session_start();

require 'assets/php/database.php';
require 'assets/php/usersession.php';

?>
<!DOCTYPE html>
<html>
<head>
<!-- irrelevant content -->
</head>
<body>
<?php
$sql = "SELECT * FROM utlansliste";

$stmt = $conn->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll();
?>

<table>
<thead>
<th>ID</th>
<th>Brukernavn</th>
<th>Datamaskin</th>
<th>Periferiutstyr</th>
<th>Start dato</th>
<th>Slutt dato</th>
<th>Oppdater tabell</th>
</thead>

<?php
foreach($result as $rows) {
?>

<tr>
<td><?php echo $rows['id']; ?></td>
<td><?php echo $rows['username']; ?></td>
<td><?php echo $rows['hostname']; ?></td>
<td><?php echo $rows['peripherals']; ?></td>
<td><?php echo $rows['start_date']; ?></td>
<td><?php echo $rows['end_date']; ?></td>
<td><a href="update.php?id=<?php echo $rows['id'];?>&hostname=<?php echo $rows['hostname'];?>"><div class="btn btn-primary">Oppdater</div></a></td>
</tr>

<?php
}
?>

</table>
</body>
</html>

update.php(用户填写表单并执行的位置)

<?php

session_start();

require 'assets/php/database.php';
require 'assets/php/usersession.php';

if(isset($_GET['id'])) {

$id = $_GET['id'];
$hostname = $_GET['hostname'];

global $conn;
$sql = "SELECT * FROM utlansliste WHERE id='$id';";
$stmt = $conn->prepare($sql);
$stmt->execute();
$row = $stmt->fetchAll();

$username = $row[0]['username'];
$peripherals = $row[0]['peripherals'];
$start_date = $row[0]['start_date'];
$end_date = $row[0]['end_date'];

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

try {

global $conn;
$sql = "UPDATE utlansliste SET username = ':username', peripherals = ':peripherals', start_date = ':start_date', end_date = ':end_date', WHERE id = ':id'";

$stmt = $conn->prepare($sql);
$stmt->bindParam(":username", $username, PDO::PARAM_STR);
$stmt->bindParam(":peripherals", $peripherals, PDO::PARAM_STR);
$stmt->bindParam(":start_date", $start_date, PDO::PARAM_STR);
$stmt->bindParam(":end_date", $end_date, PDO::PARAM_STR);
$stmt->bindParam(":id", $id, PDO::PARAM_STR);
$stmt->execute();

if ($stmt->execute()) {
echo "gg";
} else {
echo "nope";
}

/*header('Location:index.php');*/
}

catch(PDOException $exception) {
echo "Error: " . $exception->getMessage();
}
}
}
?>
<html>
<head>
<!-- irrelevant content -->
</head>
<body>
<?php include 'assets/php/header.php' ?>
<?php if( !empty($user) ): ?>
<div class="content">
<strong>Oppdater utlånsliste for <?php echo $hostname; ?></strong>
<form name="form" method="POST" action="">
<div class="updatebox" style="text-align:center;">
<label for="username">Brukernavn</label>
<div><input type="text" name="username" value="<?php echo $username;?>" id="username" required/></div>

<label for="peripherals">Periferiutstyr</label>
<div><input type="text" name="peripherals" value="<?php echo $peripherals;?>" id="peripherals"/></div>

<label for="startdate">Låne fra - dato</label>
<div><input data-date-format="YYYY/MM/DD" type="date" name="start_date" value="<?php echo $start_date;?>" id="start_date" required/></div>

<label for="enddate">Låne til - dato</label>
<div><input data-date-format="YYYY/MM/DD" type="date" name="end_date" value="<?php echo $end_date;?>" id="end_date" required/></div>

<input name="id" type="hidden" id="id" value="<?php echo $id;?>"/>
<input name="hostname" type="hidden" value="<?php echo $hostname;?>" id="hostname"/>
<input type="submit" name="submit" value="Submit"/>
</div>
</form>
</div>
<body>
</html>

其他评论

我浏览了许多网站来寻求帮助和知识。这些只是更多中的一些。我主要是在寻找知识来学习这种更新数据库的安全方法,因此即使只是一条评论也会有很大帮助!

PHPDelusions

Edit form with PHP PDO

Form in PDO to update data

The official PDO manual

The unofficial PDO manual, (PDODelusions)

最佳答案

之前的 sql 不正确 - 除了占位符周围的单引号之外,where 子句之前还有一个逗号。

$sql = "UPDATE utlansliste SET 
username = :username,
peripherals = :peripherals,
start_date = :start_date,
end_date = :end_date
WHERE id = :id";

您能否确认更新语句确实被调用了?尝试在调用 execute 方法之前/之后打印 sql,以确保程序到达该点

快速浏览 PHP 并进行一些可能(或可能没有)帮助的小更改。

<?php

try{
session_start();
$id='';

require 'assets/php/database.php';
require 'assets/php/usersession.php';

if( isset( $_GET['id'], $_GET['hostname'] ) ) {

$id = $_GET['id'];
$hostname = $_GET['hostname'];


/*
global $conn;

The `global` keyword is used within functions to allow a variable declared outside the function
to be used within the function... think `scope`
*/


/*
$sql = "SELECT * FROM utlansliste WHERE id='$id';";
As the problem revolves around prepared statements why not use a prepared statement here
and avoid the possibility of sql injection??
*/

$sql='select * from `utlansliste` where id=:id;';
$args=array( ':id' => $id );
$stmt = $conn->prepare($sql);
$res=$stmt->execute( $args );

if( !$res )throw new Exception(' Failed to SELECT records ');



$row = $stmt->fetchAll();

$username = $row[0]['username'];
$peripherals = $row[0]['peripherals'];
$start_date = $row[0]['start_date'];
$end_date = $row[0]['end_date'];

/* make sure that all variables are available... */
if( isset( $_POST['submit'], $username,$peripherals,$start_date,$end_date ) ) {

try {
/* same issue, global is NOT required */
#global $conn;

$sql = "UPDATE utlansliste SET username = :username, peripherals = :peripherals, start_date = :start_date, end_date = :end_date WHERE id = :id";

$stmt = $conn->prepare( $sql );
$stmt->bindParam(":username", $username, PDO::PARAM_STR);
$stmt->bindParam(":peripherals", $peripherals, PDO::PARAM_STR);
$stmt->bindParam(":start_date", $start_date, PDO::PARAM_STR);
$stmt->bindParam(":end_date", $end_date, PDO::PARAM_STR);
$stmt->bindParam(":id", $id, PDO::PARAM_STR);

$result = $stmt->execute();

if ( $result ) {
echo "gg";
} else {
echo "nope";
}

/*header('Location:index.php');*/
}catch(PDOException $exception) {
echo "Error: " . $exception->getMessage();
}
}
}


}catch( Exception $e ){
exit( $e->getMessage() );
}

?>

顺便说一句,下面没有必要使用准备好的语句,因为没有用户提供的变量,也不存在 SQL 注入(inject)的可能性

$sql = "SELECT * FROM utlansliste";

$stmt = $conn->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll();

如果有 where 子句,那么它可能会有所不同......也许

更新为了帮助调试 PDO 查询,我使用以下函数 debugpdo ~ 给出了有关其用法的示例。

function debugpdo( $sql=false, $args=array() ){
if( $sql && !empty( $args ) ){
$params = array();
$keys = array();
foreach( $args as $placeholder => $value ){
if( is_numeric( $value ) )$params[]=sprintf('set @%s=%d;',str_replace( ':', '', $placeholder ), $value );
else $params[]=sprintf('set @%s="%s";',str_replace( ':', '', $placeholder), str_replace( '"',"'", $value ) );
$keys[]=str_replace(':','@',$placeholder);
}
printf(
"<pre><h1>Copy & Paste this SQL into mySQL GUI Application</h1>%s\n\n%s;</pre>",
implode( PHP_EOL, $params ),
str_replace( array_keys( $args ), $keys, $sql )
);
}
}


$sql = "update `utlansliste` set `username`=:username, `peripherals`=:peripherals, `start_date`=:start_date, `end_date`=:end_date where `id`=:id";
$args = array(
':username' => $username,
':peripherals' => $peripherals,
':start_date' => $start_date,
':end_date' => $end_date,
':id' => $id
);


/* To debug the sql, uncomment this and run... */
exit( debugpdo( $sql, $args ) );

/* code continues... */
$stmt = $conn->prepare( $sql );
$result = $stmt->execute( $args );

关于php - 通过HTML表单使用bindParam对数据库执行PDO,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54306998/

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