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php 编辑/添加新内容使用数据库中的 POST/GET 进行混淆

转载 作者：行者123 更新时间：2023-11-30 00:15:14 28 4
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为了获得创建网站后端的帮助，我正在遵循本教程 -> http://www.killersites.com/community/index.php?/topic/3064-basic-php-system-view-edit-add-delete-records-with-mysqli/但我的编辑按钮无法正常工作；相反，当用户在现有行上单击它，重定向到更新表单并输入值时，新行将添加到表中，而不是编辑现有行。

我在同一个文件中编辑/添加 php 代码，如下所示:

<?php
/*
Allows the user to both create new records and edit existing records
*/

//connect to database
include ("newDBconn.php");

//creates the new/edit record form, with a function that makes it easily reusable since this form is used multiple times

function renderForm($first= '', $last='', $error = '', $groomingid = '')
{ ?>

<html>
<head>
<link href="adminnewstyle.css" rel="stylesheet" type="text/css" />

<title>
<h1><?php if ($groomingid != '') { echo "Edit Appointment"; } 
else
{
    echo "New Record"; }?> 
</h1>    
</title>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
    <h1><?php if ($groomingid != '') { echo "Edit Appointment"; } else { echo "New Record"; } ?> </h1>    

        <?php if ($error !='') {
            echo "<div style='padding:4px; border:1px solid red; color:red'>" . $error
                            ."</div>";
        } ?>

       <form action="" method="post">
        <div>
            <?php if ($groomingid != '') { ?>
                    <input type="hidden" name="GroomingID" value="<?php echo $groomingid; ?>" />
                        <p>ID: <?php echo $GroomingID; ?> </p>
                      <?php } ?>

                      <strong>First Name: *</strong> <input type="text"
 name="FirstName" value="<?php echo $first; ?>" /> 
                    <br />
                    <strong>Last Name: *</strong> <input type="text" name="LastName" value="<?php echo $last; ?>"/>
                   <p>*required</p>
                   <input type="submit" name="submit" value="Submit"/>
         </div>
       </form>
</body>
</html>
<?php }

/*
Edit Record

*/
//if the 'id' variable is set in the URL, we know that we need to edit a record 
if (isset($_GET['GroomingID']))
{
    //if the form's submit button is clicked, we need to process the form
    if (isset($_POST['submit']))
    {
            //make sure the 'id' in the URL is valid
            if (is_numeric($_POST['GroomingID']))
                {
                    //get variables from the URL/form
                    $groomingid = $_POST['GroomingID'];
                    $firstname = htmlentities($_POST['FirstName'], ENT_QUOTES);
                    $lastname = htmlentities($_POST['LastName'], ENT_QUOTES);

                //check that firstname and lastname are both not empty
                    if ($firstname == '' || $lastname == '')
                        {
                //if they are empty, show an error message and display the form

                        $error = 'ERROR: Please fill in all required fields!';
                        renderForm($firstname, $lastname, $error, $groomingid);
                    }
                    else
                    {
                        //if everything is fine, update the record in the database
                if($stmt = $mysqli->prepare("UPDATE grooming SET FirstName = ?, LastName = ? WHERE GroomingID=?"))
            {
                    $stmt->bind_param("ssi", $firstname, $lastname, $groomingid);
                    $stmt->execute();
                    $stmt->close();
            }
            //show an error message if the query encounters an error
            else
            {
                echo "Error: could not prepare sql statement.";
            }

            //redirect the user once the form is updated
            header("Location: PS_Manage_Appnts.php");
            exit();
        }
    }
    //if the 'id' variable isn't valid, show error message
    else
    {
        echo "Error";
    }
}
    //if the form hasn't been submitted yet, get the info from the database and show the form
    else
    {
        //make sure the 'id' value is valid
        if (is_numeric($_GET['GroomingID']) && $_GET['GroomingID'] > 0)
        {
            //get 'id' from URL
            $id = $_GET['GroomingID'];

            //get the record from the database
            if($stmt = $mysqli->prepare("SELECT * FROM grooming WHERE GroomingID=?"))
                {
                    $stmt->bind_param("i", $groomingid);
                    $stmt->execute();

                    $stmt->bind_result($groomingid, $firstname, $lastname);
                    $stmt->fetch();

                //show the form
                renderForm($firstname, $lastname, NULL, $groomingid);

                $stmt->close();
            }

            //show an error if the query has an error
            else
            {
                echo "Error: could not prepare SQL statement.";
            }
        }
//if the 'id' value is not valid, redirect the user back to the PS_Manage_Appnts.php page

        else 
            {
                header("location:PS_Manage_Appnts.php");
                exit();
             }
        }
}

    /* NEW RECORD

    */
    //if the 'id' variable is not set in the URL, we must be creating a new record
    else
        {
            //if the form's submit button is clicked, we need to process the form
            if (isset($_POST['submit']))
            {
                //get the form data
                $firstname = htmlentities($_POST['FirstName'], ENT_QUOTES);
                $lastname = htmlentities($_POST['LastName'], ENT_QUOTES);

                //check that firstname and lastname are both not empty
                if ($firstname == '' || $lastname == '')
                {
                    //if they are empty, show an error message and display the form

                    $error = 'ERROR: Please fill in all required fields!';
                    renderForm($firstname, $lastname, $error);
                }
                else
                {
                    //insert the new record into the database
                    if($stmt = $mysqli->prepare("INSERT grooming (FirstName, LastName) VALUES (?, ?)"))
                    {
                        $stmt->bind_param("ss", $firstname, $lastname);
                        $stmt->execute();
                        $stmt->close();
                    }
                    //show an error if the query has an error
                    else
                    {
                        echo "Error: could not prepare sql statement.";
                    }

                    //redirect the user
                    header ("location:PS_Manage_Appnts.php");
                    exit();

                }

            }
            //if the form hasn't been submitted yet, show the form
            else
            {
                renderForm();
            }           
}
//close the connection
$mysqli->close();
?>

我想知道这种混淆是否与同一页面中的代码有关，或者我是否只是混淆了在何处使用 $_Get 和 $Post (或完全是其他东西)。我已经检查了一遍又一遍地检查了教程中的代码，浏览了 stackoverflow 来寻找类似的答案和提示，但到目前为止我还是一无所获。我究竟做错了什么？

最佳答案

您的问题在这里:

if (isset($_GET['GroomingID']))
{
    //if the form's submit button is clicked, we need to process the form
    if (isset($_POST['submit']))
    {

当您的表单发布到同一页面时 - 无需添加查询变量 GroomingID - 当您发布已编辑的表单时，第一个条件的计算结果为 false。

您应该检查 POST 或 GET:

if (isset($_GET['GroomingID']) || isset($_POST['GroomingID']))

或者:

if (isset($_REQUEST['GroomingID']))    // assuming there are no cookies with the same name

关于php 编辑/添加新内容使用数据库中的 POST/GET 进行混淆，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23704742/

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