我想在以下代码中获得最新评论，但现在只显示最早的50条评论，如何编辑代码以显示最新的50条评论？非常感谢
<?php
class comments extends db_connect
{
private $requestFrom = 0;
private $language = 'en';
public function __construct($dbo = NULL)
{
parent::__construct($dbo);
}
public function allCommentsCount()
{
$stmt = $this->db->prepare("SELECT max(id) FROM comments");
$stmt->execute();
return $number_of_rows = $stmt->fetchColumn();
}
public function count($postId)
{
$stmt = $this->db->prepare("SELECT count(*) FROM comments WHERE postId = (:postId) AND removeAt = 0");
$stmt->bindParam(":postId", $postId, PDO::PARAM_INT);
$stmt->execute();
return $number_of_rows = $stmt->fetchColumn();
}
public function create($postId, $text, $notifyId = 0)
{
$result = array("error" => true,
"error_code" => ERROR_UNKNOWN);
if (strlen($text) == 0) {
return $result;
}
$post = new post($this->db);
$postInfo = $post->info($postId);
unset($post);
$currentTime = time();
$ip_addr = helper::ip_addr();
$u_agent = helper::u_agent();
$stmt = $this->db->prepare("INSERT INTO comments (fromUserId, postId, comment, createAt, notifyId, ip_addr, u_agent) value (:fromUserId, :postId, :comment, :createAt, :notifyId, :ip_addr, :u_agent)");
$stmt->bindParam(":fromUserId", $this->requestFrom, PDO::PARAM_INT);
$stmt->bindParam(":postId", $postId, PDO::PARAM_INT);
$stmt->bindParam(":comment", $text, PDO::PARAM_STR);
$stmt->bindParam(":createAt", $currentTime, PDO::PARAM_INT);
$stmt->bindParam(":notifyId", $notifyId, PDO::PARAM_INT);
$stmt->bindParam(":ip_addr", $ip_addr, PDO::PARAM_STR);
$stmt->bindParam(":u_agent", $u_agent, PDO::PARAM_STR);
if ($stmt->execute()) {
$result = array("error" => false,
"error_code" => ERROR_SUCCESS,
"commentId" => $this->db->lastInsertId(),
"comment" => $this->info($this->db->lastInsertId()));
if ($this->requestFrom != $postInfo['fromUserId']) {
$gcm = new gcm($this->db, $postInfo['fromUserId']);
$gcm->setData(GCM_NOTIFY_COMMENT, "You have a new comment.", $postId);
$gcm->send();
}
}
return $result;
}
public function remove($commentId)
{
$result = array("error" => true,
"error_code" => ERROR_UNKNOWN);
$commentInfo = $this->info($commentId);
if ($commentInfo['error'] === true) {
return $result;
}
// if ($commentInfo['fromUserId'] != $this->requestFrom) {
//
// return $result;
// }
$currentTime = time();
$stmt = $this->db->prepare("UPDATE comments SET removeAt = (:removeAt) WHERE id = (:commentId)");
$stmt->bindParam(":commentId", $commentId, PDO::PARAM_INT);
$stmt->bindParam(":removeAt", $currentTime, PDO::PARAM_INT);
if ($stmt->execute()) {
$result = array("error" => false,
"error_code" => ERROR_SUCCESS);
}
return $result;
}
public function removeAll($postId) {
$currentTime = time();
$stmt = $this->db->prepare("UPDATE comments SET removeAt = (:removeAt) WHERE postId = (:postId)");
$stmt->bindParam(":postId", $postId, PDO::PARAM_INT);
$stmt->bindParam(":removeAt", $currentTime, PDO::PARAM_INT);
}
public function info($commentId)
{
$result = array("error" => true,
"error_code" => ERROR_UNKNOWN);
$stmt = $this->db->prepare("SELECT * FROM comments WHERE id = (:commentId) LIMIT 1");
$stmt->bindParam(":commentId", $commentId, PDO::PARAM_INT);
if ($stmt->execute()) {
if ($stmt->rowCount() > 0) {
$row = $stmt->fetch();
$time = new language($this->db, $this->language);
$profile = new profile($this->db, $row['fromUserId']);
$fromUserId = $profile->get();
unset($profile);
$lowPhotoUrl = "/img/profile_default_photo.png";
if (strlen($fromUserId['lowPhotoUrl']) != 0) {
$lowPhotoUrl = $fromUserId['lowPhotoUrl'];
}
$post = new post($this->db);
$post->setRequestFrom($this->getRequestFrom());
$postInfo = $post->info($row['postId']);
$result = array("error" => false,
"error_code" => ERROR_SUCCESS,
"id" => $row['id'],
"fromUserId" => $row['fromUserId'],
"fromUserState" => $fromUserId['state'],
"fromUserUsername" => $fromUserId['username'],
"fromUserFullname" => $fromUserId['fullname'],
"fromUserPhotoUrl" => $lowPhotoUrl,
"postId" => $row['postId'],
"postFromUserId" => $postInfo['fromUserId'],
"comment" => htmlspecialchars_decode(stripslashes($row['comment'])),
"createAt" => $row['createAt'],
"notifyId" => $row['notifyId'],
"timeAgo" => $time->timeAgo($row['createAt']));
}
}
return $result;
}
public function get($postId, $commentId = 0)
{
if ($commentId == 0) {
$commentId = $this->allCommentsCount() + 1;
}
$comments = array("error" => false,
"error_code" => ERROR_SUCCESS,
"commentId" => $commentId,
"postId" => $postId,
"comments" => array());
$stmt = $this->db->prepare("SELECT id FROM comments WHERE postId = (:postId) AND id < (:commentId) AND removeAt = 0 ORDER BY id ASC LIMIT 0,38");
$stmt->bindParam(':postId', $postId, PDO::PARAM_INT);
$stmt->bindParam(':commentId', $commentId, PDO::PARAM_INT);
if ($stmt->execute()) {
while ($row = $stmt->fetch()) {
$commentInfo = $this->info($row['id']);
array_push($comments['comments'], $commentInfo);
$comments['commentId'] = $commentInfo['id'];
unset($commentInfo);
}
}
return $comments;
}
public function getPreview($postId)
{
$commentId = $this->allCommentsCount() + 1;
$comments = array("error" => false,
"error_code" => ERROR_SUCCESS,
"commentId" => $commentId,
"postId" => $postId,
"count" => $this->count($postId),
"comments" => array());
$stmt = $this->db->prepare("SELECT id FROM comments WHERE postId = (:postId) AND id < (:commentId) AND removeAt = 0 ORDER BY id ASC LIMIT 3");
$stmt->bindParam(':postId', $postId, PDO::PARAM_INT);
$stmt->bindParam(':commentId', $commentId, PDO::PARAM_INT);
if ($stmt->execute()) {
while ($row = $stmt->fetch()) {
$commentInfo = $this->info($row['id']);
array_push($comments['comments'], $commentInfo);
$comments['commentId'] = $commentInfo['id'];
unset($commentInfo);
}
}
return $comments;
}
public function setLanguage($language)
{
$this->language = $language;
}
public function getLanguage()
{
return $this->language;
}
public function setRequestFrom($requestFrom)
{
$this->requestFrom = $requestFrom;
}
public function getRequestFrom()
{
return $this->requestFrom;
}
}
答案 0 :(得分：0)
尝试将LIMIT从LIMIT 0,38修改为LIMIT 38。