【发布时间】：2015-10-08 09:46:23
【问题描述】：
长期阅读，第一次海报。我是一个新手 PHP 爱好者，我有一个我一直在工作的页面。现在我的数据库连接运行良好，我的 SELECT 语句给了我需要的信息。我的问题有两个（可能在这篇文章之后更多；将你的移相器设置为畏缩）：
在某一时刻，我让 INSERT 工作，但它突然停止了，似乎没有任何调整可以将其恢复。我已经验证 INSERT 语句在没有变量的单独 PHP 文件中工作。
当我确实让 INSERT 工作时，每次刷新页面都会复制最后一个条目。我尝试了几种方法来清除 $_POST 数组，但我认为我的一些实验会导致问题 #1。
<?php
$dbhost = "REDACTED";
$dbuser = "REDACTED";
$dbpass = "REDACTED";
$dbname = "guest_list";
// Create a database connection
$connection = mysqli_connect($dbhost, $dbuser, $dbpass, $dbname);
// Test if connection succeeded
if(mysqli_connect_errno()) {
die("DB's not here, man: " .
mysqli_connect_error() .
" (" . mysqli_connect_errno() . ")"
);
}
// replacement for mysql_real_escape_string()
function html_escape($html_escape) {
$html_escape = htmlspecialchars($html_escape, ENT_QUOTES | ENT_HTML5, 'UTF-8');
return $html_escape;
}
// Posting new data into the DB
if (isset($_POST['submit'])) {
$first = html_escape($_POST['first']);
$last = html_escape($_POST['last']);
$contact = html_escape($_POST['contact']);
$associate = html_escape($_POST['associate']);
$insert = "INSERT INTO g_list (";
$insert .= "g_fname, g_lname, g_phone, g_association) ";
$insert .= "VALUES ('{$first}', '{$last}', '{$contact}', '{$associate}')";
$insert .= "LIMIT 1";
$i_result = mysqli_query($connection, $insert);
// I have verified that the above works by setting the varialble
// in the VALUES area to strings and seeing it update
}
$query = "SELECT * ";
$query .= "FROM g_list ";
$query .= "ORDER BY g_id DESC";
$q_result = mysqli_query($connection, $query);
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Guest List</title>
<link href="guest.css" media="all" rel="stylesheet" type="text/css" />
</head>
<body>
<header>
<h1>REDACTED</h1>
<h2>Guest Registry</h2>
</header>
<div class="container">
<div class="registry">
<form name="formup" id="main_form" method="post">
<fieldset>
<legend>Please enter your name into the registry</legend>
<p class="first">First Name:
<input type="text" name="first" value="" placeholder="One or more first names" size="64"></p>
<p class="last">Last Name:
<input type="text" name="last" value="" placeholder="Last name" size="64"></p>
<p class="contact">Phone Number or Email:
<input type="text" name="contact" value="" placeholder="" size="32"></p>
<p class="associate">Your relation?
<input type="text" name="associate" value="" placeholder="" size="128"></p>
<p class="submit">
<input type="submit" name="submit" title="add" value="submit" placeholder=""></p>
</fieldset>
</form>
</div>
</div>
<h3>Guest List:</h3>
<table>
<tr>
<th>Firstname(s)</th><th>Lastname</th>
<th>Phone or Email</th><th>Association</th>
</tr>
<?php while($guest = mysqli_fetch_assoc($q_result)) {
echo "<tr>" . "<td>" . $guest["g_fname"] . "</td>"
. "<td>" . $guest["g_lname"] . "</td>"
. "<td>" . $guest["g_phone"] . "</td>"
. "<td>" . $guest["g_association"] . "</td>" . "</tr>";
} ?>
</table>
<footer>
<div>Copyright <?php echo date("Y"); ?>, REDACTED, LLC.</div>
<?php
if (isset($connection)) {
mysqli_close($connection);
}
?>
</footer>
</body>
</html>【问题讨论】：
-
您没有对查询进行任何错误检查，您只是假设它们会起作用。检查您的错误日志。
-
你可以检查你的插入查询是否有这样的错误
$i_result = mysqli_query($connection, $insert) or trigger_error($connection->error."[$insert]");