我有下面的代码,我没有得到任何我的数据库输出出现在我的网站上。我只得到echo "<p>This topic does not exist.</p>";
的else语句回应响应,但我在我的数据库中有主题。数据库输出未显示。获取其他语句
有没有人在我的代码中看到任何会导致此不显示任何输出并使else语句出现?如果没有,我该如何调试以找出问题?我没有从我准备好的语句中得到任何错误,所以它必须位于numrows语句或while
循环内。
$con = mysqli_connect("localhost", "root", "", "db");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
$cid = $_GET['cid'];
$tid = $_GET['tid'];
$userid = (isset($_SESSION['user']) ? $_SESSION['user'] : "");
//Prepared SELECT stmt to get forum topics
$stmt = $con->prepare("SELECT * FROM forum_topics WHERE `category_id`=? AND id=? LIMIT 1");
if (!$stmt || $con->error) {
die('Select topics prepare() failed: ' . htmlspecialchars($con->error));
}
if(!$stmt->bind_param('ii', $cid, $tid)) {
die('Select topics bind_param() failed: ' . htmlspecialchars($stmt->error));
}
if(!$stmt->execute()) {
die('Select topics execute() failed: ' . htmlspecialchars($stmt->error));
}
$numrows = $stmt->num_rows;
if($numrows == 1){
echo "<table width='100%'>";
if ($_SESSION['user']) {
echo "<tr><td colspan='2'><input type='submit' value='Add Reply' onClick=\"window.location =
'forum_post_reply.php?cid=".$cid."$tid=".$tid."'\"> <hr />";
} else {
echo "<tr><td colspan='2'><p>Please log in to add your reply</p><hr /></td></tr>";
}
while($row = mysqli_fetch_assoc($stmt)){
//Prepared SELECT stmt to get forum topics
$stmt2 = $con->prepare("SELECT * FROM forum_posts WHERE `category_id`=? AND topic_id=?");
if (!$stmt2 || $con->error) {
die('Select topics prepare() failed: ' . htmlspecialchars($con->error));
}
if(!$stmt2->bind_param('ii', $cid, $tid)) {
die('Select topics bind_param() failed: ' . htmlspecialchars($stmt2->error));
}
if(!$stmt2->execute()) {
die('Select topics execute() failed: ' . htmlspecialchars($stmt2->error));
}
while($row2 = mysqli_fetch_assoc($stmt2)){
echo "<tr><td valign='top' style='border: 1px solid #000000;'>
<div style='min-height: 125px;'>".$row['topic_title']."<br />
by ".$row2['post_creator']." - " .$row2['post_date']. "<hr />" . $row2['post_content'] ."</div></td>
<td width='200' valign='top' align='center' style='border: 1px solid #000000;'>User Info Here!</td></tr>
<tr><td colspan='2'><hr /></td></tr>";
}
}
} else {
echo "<p>This topic does not exist.</p>";
}
$cid = $_GET['cid'];
是类别ID
`$tid = $_GET['tid'];` is another id
尝试'$ numRows行> 1' –
没有帮助。不过谢谢。 – Paul
在'phpmyadmin'中尝试这个查询 –