使用php表单将值存储到数据库中答案

【问题标题】：Storing the values into database using php forms使用php表单将值存储到数据库中
【发布时间】：2016-01-21 15:09:00
【问题描述】：

最终编辑：谢谢大家的帮助。我一直在尝试在 index.php 而不是 submit.php 中编写与连接相关的所有代码。现在已经解决了。

编辑：

我已根据您的反馈更新了代码。我现在可以将值获取到数据库，但问题是它只显示空结果。这是更新的代码。

 <form action="submit.php" method="post" class="form-horizontal">
                        <div class="form-group">
                            <label for="name" class ="col-lg-2 control-label" > Name</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="name" name="name" placeholder="Enter your Name" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="email" class ="col-lg-2 control-label" > Email</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="email" name="email" placeholder="Enter your email address" required>
                            </div>
                        </div>

                </div> <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="subject" class ="col-lg-2 control-label" > Subject</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="subject" name="subject" placeholder="Your Subject" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal">

                        <div class="form-group">
                            <label for="message" class ="col-lg-2 control-label" > Message</label>
                            <div class="col-lg-7">
                                <textarea name="message" class="form-control" id ="message" cols="20" rows="3" placeholder="Your Message"></textarea>
                            </div>
                        </div> <!-- end form -->
                        <div class="col-lg-1">

             </div>
                        <div class="form-group">
                            <div class="col-lg-7 col-lg-offset-2">
                            <button type="submit" name="submit" class="btn btn-primary">Submit</button>
                            </div>
                        </div>
                    </form>

PHP 代码：

    <?php
    if (isset($_POST)) {
    $conn = mysqli_connect($servername, $username, $password, $db_name);//             Establishing Connection with Server
    mysqli_set_charset($conn, 'utf8');
    if (!$conn) {
    die("Database connection failed: " . mysqli_error($conn));
    }
    else 
    echo "connected successfully";

//Escaping string, not 100% safe, also consider validating rules and sanitization
    $name = mysqli_real_escape_string($conn, $_POST['name']);
    $email = mysqli_real_escape_string($conn, $_POST['email']);
    $subject = mysqli_real_escape_string($conn, $_POST['subject']);
    $message = mysqli_real_escape_string($conn, $_POST['message']);
    $result = mysqli_query($conn, "INSERT INTO contact (user, email, subject, message) VALUES ('$name', '$email', '$subject', '$message')");

    }
    ?>

Here is the snapshot of the database

我有一个使用 HTML 制作的表单。当我在数据库中提交表单时，我想存储结果。连接成功，但数据未存储在数据库中。

submit.php 所做的基本上只是发送文本“成功提交表单”。

这是我的代码：

<form action="submit.php" method="post" class="form-horizontal">
                        <div class="form-group">
                            <label for="name" class ="col-lg-2 control-label" > Name</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="name" placeholder="Enter your Name" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="email" class ="col-lg-2 control-label" > Email</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="email" placeholder="Enter your email address" required>
                            </div>
                        </div>

                </div> <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="subject" class ="col-lg-2 control-label" > Subject</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="subject" placeholder="Your Subject" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal">

                        <div class="form-group">
                            <label for="message" class ="col-lg-2 control-label" > Message</label>
                            <div class="col-lg-7">
                                <textarea name="message" class="form-control" id ="message" cols="20" rows="3" placeholder="Your Message"></textarea>
                            </div>
                        </div> <!-- end form -->
                        <div class="col-lg-1">

             </div>
                        <div class="form-group">
                            <div class="col-lg-7 col-lg-offset-2">
                            <button type="submit" class="btn btn-primary">Submit</button>
                            </div>
                        </div>
                    </form>

PHP 代码：

$conn = mysqli_connect($servername, $username, $password, $db_name);//         Establishing Connection with Server
mysqli_set_charset($conn, 'utf8');
if (!$conn) {
die("Database connection failed: " . mysqli_error($conn));
}
else 
    echo "connected successfully";

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

//Escaping string, not 100% safe, also consider validating rules and sanitization
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$subject = mysqli_real_escape_string($conn, $_POST['subject']);
$message = mysqli_real_escape_string($conn, $_POST['message']);
$result = mysqli_query($conn, "INSERT INTO contact (user, email, subject, message) VALUES ('$name', '$email', '$subject', '$message');");
if ($result) {
$message="successfully sent the query!!";
}
else
{$message="try again!!";}
}
 ?>

【问题讨论】：

标签： php mysql forms mysqli

【解决方案1】：

您的所有输入字段都没有name="" 属性，包括按钮。所以这些字段都不会在 $_POST 数组中发送。

将这样的name="" 属性添加到要发送到 PHP 的所有字段

<form action="submit.php" method="post" class="form-horizontal">
   <div class="form-group">
       <label for="name" class ="col-lg-2 control-label" > Name</label>
       <div class="col-lg-7">
           <input type="text" class="form-control" id ="name" name="name" placeholder="Enter your Name" required>
       </div>
    </div>

    </div>
    <div class="col-lg-1">
        </div>
        <div class="form-horizontal" >
            <div class="form-group">
                <label for="email" class ="col-lg-2 control-label" > Email</label>
                <div class="col-lg-7">
                    <input type="text" class="form-control" id ="email" name="email" placeholder="Enter your email address" required>
                </div>
             </div>
        </div> 
        <div class="col-lg-1"></div>
            <div class="form-horizontal" >
                <div class="form-group">
                   <label for="subject" class ="col-lg-2 control-label" > Subject</label>
                   <div class="col-lg-7">
                      <input type="text" class="form-control" id ="subject" name="subject" placeholder="Your Subject" required>
                   </div>
                </div>

         </div>
         <div class="col-lg-1"></div>
         <div class="form-horizontal">
             <div class="form-group">
                 <label for="message" class ="col-lg-2 control-label" > Message</label>
                 <div class="col-lg-7">
                     <textarea name="message" class="form-control" id ="message" name="message" cols="20" rows="3" placeholder="Your Message"></textarea>
                 </div>
             </div> <!-- end form -->
             <div class="col-lg-1"></div>
                <div class="form-group">
                   <div class="col-lg-7 col-lg-offset-2">
                      <button type="submit" class="btn name="submit" btn-primary">Submit</button>
                   </div>
                 </div>
       </form>

同样在submit.php 中的代码中更改此设置，以便在发生错误消息时看到实际的错误消息。

if ($result) {
    $message="successfully sent the query!!";
} else {
    $message="Insert failed : " . mysqli_error($conn);
}
echo $message;

虽然这确实假设您实际上在代码中的某处显示了 $message 值，但您没有向我们显示。

【讨论】：

我已经添加了名称字段，但它仍然是一样的。 if($result) 会发生什么？我没有收到任何消息。一旦我点击提交，它就会进入 submit.php 页面
好的，也请参阅为您的数据库访问错误处理建议的 mod
您能看一下更新后的代码吗？它正在返回空字段
你没有修改查询错误检查，实际上看起来你完全删除了它
是的，我做到了。它正在连接到数据库，每当我提交表单时，都会存储空值。我认为可能有一个小问题。我真的很感激你能谈谈看看它。

【解决方案2】：

您必须将name 属性添加到您的button 元素，以便if (isset($_POST['submit'])) 将是true。

请更改

<button type="submit" class="btn btn-primary">Submit</button>

到

<button type="submit" name="submit" class="btn btn-primary">Submit</button>

或

<input type="submit" name="submit" value="Submit" class="btn btn-primary" />

【讨论】：

if (isset($_POST['submit'])) { ... }里面的代码到达了吗？也请在您的mysqli_query 之后添加var_dump($result); 以检查您的查询结果。
那是因为此规则适用于所有输入字段。你的都没有name="" 属性，所以不会在 POST 上发送
我添加了一个名称字段，但它仍然是一样的。
您必须指定哪些代码被执行，哪些代码没有被执行，以便我们定位问题。
我有一些更改@mapek。检查编辑并让我知道问题所在

【解决方案3】：

首先你必须为每个输入标签和按钮标签提供 name 属性以获得更好的方法：

<form action="submit.php" method="post" class="form-horizontal">
                        <div class="form-group">
                            <label for="name" class ="col-lg-2 control-label" > Name</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="name" name ="name" placeholder="Enter your Name" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="email" class ="col-lg-2 control-label" > Email</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" name ="email" id ="email" placeholder="Enter your email address" required>
                            </div>
                        </div>

                </div> <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="subject" class ="col-lg-2 control-label" > Subject</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" name ="subject" id ="subject" placeholder="Your Subject" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal">

                        <div class="form-group">
                            <label for="message" class ="col-lg-2 control-label" > Message</label>
                            <div class="col-lg-7">
                                <textarea name="message" class="form-control" name ="message"  id ="message" cols="20" rows="3" placeholder="Your Message"></textarea>
                            </div>
                        </div> <!-- end form -->
                        <div class="col-lg-1">

             </div>
                        <div class="form-group">
                            <div class="col-lg-7 col-lg-offset-2">
                            <button type="submit" name ="submit" class="btn btn-primary">Submit</button>
                            </div>
                        </div>
                    </form>

在数据库中插入数据的 PHP 代码：

$result = mysqli_query($conn, "INSERT INTO contact (user, email, subject, message) VALUES ('".$name."', '".$email."', '".$subject."', '".$message."')");

【讨论】：

我已经修改了代码。请检查编辑并让我知道问题出在哪里。它在数据库中返回空值。也检查数据库图像。
你有没有像我的查询一样在插入查询中连接 php 变量，因为在某些情况下会出现问题...
也试过你的代码。一样的。它现在正在向数据库发送空字段。

【解决方案4】：

试试这个代码：-

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
$conn = mysqli_connect($servername, $username, $password, $db_name);//         Establishing Connection with Server
mysqli_set_charset($conn, 'utf8');
if (!$conn) {
die("Database connection failed: " . mysqli_error($conn));
}
else 
    echo "connected successfully";

//Escaping string, not 100% safe, also consider validating rules and sanitization
$name = mysqli_real_escape_string($conn, $_POST['name']);
$email = mysqli_real_escape_string($conn, $_POST['email']);
$subject = mysqli_real_escape_string($conn, $_POST['subject']);
$message = mysqli_real_escape_string($conn, $_POST['message']);
$result = mysqli_query($conn, "INSERT INTO contact (user, email, subject, message) VALUES ('$name', '$email', '$subject', '$message')");

echo "INSERT INTO contact (user, email, subject, message) VALUES ('$name', '$email', '$subject', '$message')";//die;

if ($result) {
$message="successfully sent the query!!";
}
else
{$message="try again!!";}
}
?>

<form action="index.php" method="post" class="form-horizontal">
                        <div class="form-group">
                            <label for="name" class ="col-lg-2 control-label" > Name</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" name ="name" id ="name" placeholder="Enter your Name" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="email" class ="col-lg-2 control-label" > Email</label>
                            <div class="col-lg-7">
                                <input type="text" class="form-control" id ="email" name="email" placeholder="Enter your email address" required>
                            </div>
                        </div>

                </div> <div class="col-lg-1">

             </div>
                <div class="form-horizontal" >

                        <div class="form-group">
                            <label for="subject" class ="col-lg-2 control-label" > Subject</label>
                            <div class="col-lg-7">
                                <input type="text" name="subject" class="form-control" id ="subject" placeholder="Your Subject" required>
                            </div>
                        </div>

                </div>
             <div class="col-lg-1">

             </div>
                <div class="form-horizontal">

                        <div class="form-group">
                            <label for="message" class ="col-lg-2 control-label" > Message</label>
                            <div class="col-lg-7">
                                <textarea name="message" class="form-control" id ="message" cols="20" rows="3" placeholder="Your Message"></textarea>
                            </div>
                        </div> <!-- end form -->
                        <div class="col-lg-1">

             </div>
                        <div class="form-group">
                            <div class="col-lg-7 col-lg-offset-2">
                            <button type="submit" class="btn btn-primary" name="submit">Submit</button>
                            </div>
                        </div>
                    </form>

【讨论】：

删除了它。但没用
我已经进行了更改。现在看看。 @Rahautos
不，不是.. 现在，当我提交空字段时，正在存储。检查数据库快照
请再次检查我的答案@user3656329