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老师批语：评论功能有意思
PDO连接mysql数据库----渲染页面数据
第一步：列出连接数据库所需参数，然后拼接字符串，
$db = [
'type' => 'mysql',
'host' => '127.0.0.1',
'dbname' => 'chen',
'username' => 'root',
'password' => 'root'
];
$dsn = "{$db['type']}:host={$db['host']};dbname={$db['dbname']}";
第二步：实例pdo，连接数据库
try {
$pdo = new PDO($dsn, $db['username'], $db['password']);
} catch (PDOException $e) {
die('数据库连接错误: ' . $e->getMessage());
}
第三步：创建sql语句
$sql3 = 'SELECT * FROM `category`';
第四步：创建预处理对象
$cate_p = $pdo->prepare($sql3);
第五步：执行数据库操作
if ($cate_p->execute()) {
//取出所查询的全部数据
$cates = $cate_p->fetchAll(PDO::FETCH_ASSOC);
} else {
die('<pre>' . print_r($cate_p->errorInfo(), true));
}
运用实例如下：
<?php
// 共用文件
function randomkeys($length)
{
$key='';
$pattern = '1234567890abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLOMNOPQRSTUVWXYZ';
for ($i = 0; $i < $length; $i++) {
$key .= $pattern{
mt_rand(0, 35)}; //生成php随机数
}
return $key;
}
$db = [
'type' => 'mysql',
'host' => '127.0.0.1',
'dbname' => 'chen',
'username' => 'root',
'password' => 'root'
];
$dsn = "{$db['type']}:host={$db['host']};dbname={$db['dbname']}";
try {
$pdo = new PDO($dsn, $db['username'], $db['password']);
} catch (PDOException $e) {
die('数据库连接错误: ' . $e->getMessage());
}
//电影分类
$sql3 = 'SELECT * FROM `category`';
$cate_p = $pdo->prepare($sql3);
if ($cate_p->execute()) {
$cates = $cate_p->fetchAll(PDO::FETCH_ASSOC);
} else {
die('<pre>' . print_r($cate_p->errorInfo(), true));
}
//系统设置
$sql = 'SELECT * FROM `system`';
$shuju = $pdo->prepare($sql);
if ($shuju->execute()) {
$title = $shuju->fetch(PDO::FETCH_ASSOC);
} else {
die('<pre>' . print_r($shuju->errorInfo(), true));
}
//电影详情
$sql2 = 'SELECT * FROM `movies`';
$shuju2 = $pdo->prepare($sql2);
if ($shuju2->execute()) {
$movies = $shuju2->fetchAll(PDO::FETCH_ASSOC);
} else {
die('<pre>' . print_r($shuju2->errorInfo(), true));
}
//添加评论
if ($_SERVER['REQUEST_METHOD'] != 'POST') {
echo json_encode(array(
'code' => 111,
));
} else {
$img = 'gir.gif';
$name = randomkeys(10);
$textarea = $_POST['textarea'];
$mov_id = $_POST['moc_id'];
$cate_id = $_POST['cate_id'];
$sql4 = 'INSERT INTO `COMMENT` SET `mov_id`=:mov_id,`name`=:name,`image`=:image,`detail`=:detail,`cate_id`=:cate_id';
$shuju4 = $pdo->prepare($sql4);
$shuju4->bindParam('mov_id', $mov_id, PDO::PARAM_INT);
$shuju4->bindParam('name', $name, PDO::PARAM_STR);
$shuju4->bindParam('image', $img, PDO::PARAM_STR);
$shuju4->bindParam('detail', $textarea, PDO::PARAM_STR);
$shuju4->bindParam('cate_id', $cate_id, PDO::PARAM_INT);
if ($shuju4->execute()) {
if($shuju4->rowCount()>0){
echo json_encode(
array(
'code'=>222,
'img'=>$img,
'name'=>$name,
'textarea'=>$textarea
));
}
} else {
die('<pre>' . print_r($shuju4->errorInfo(), true));
}
}点击 "运行实例" 按钮查看在线实例
<?php
include_once __DIR__.'/common.php';
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="static/css/style1.css">
<title><?php echo $title['copy'].'的'.$title['title']; ?></title>
</head>
<body>
<!--头部导航-->
<div class="header">
<ul class="nav">
<li><a href="index.php">首页</a></li>
<?php foreach ($cates as $cate) : ?>
<li><a href="<?php echo$cate['name']; ?>.php?cate_id=<?php echo $cate['cate_id']; ?>"><?php echo $cate['alias'] ?></a></li>
<?php endforeach; ?>
</ul>
</div>
<?php
// 加载公共头部
include __DIR__ . '/header.php';
$mov_id = intval($_GET['mov_id']);
foreach ($movies as $movie) {
if ($movie['mov_id'] == $mov_id) {
echo '<h3 cate_id="'.$movie['cate_id'].'">'.$movie['name'].'</h3>';
echo '<img src="/0920/static/img/' . $movie['image'] . '" alt="" width="300">';
echo "<p style='text-indent: 2em'>{$movie['detail']}</p>";
}
};
$sql3 = 'SELECT * FROM `comment`';
$shuju3 = $pdo->prepare($sql3);
if ($shuju3->execute()) {
$comment = $shuju3->fetchAll(PDO::FETCH_ASSOC);
} else {
die('<pre>' . print_r($shuju3->errorInfo(), true));
}
echo '<div class="comment">
<h3>观影评论：</h3>
<ul>';
foreach ($comment as $k => $v) {
if ($v['mov_id'] == $mov_id) {
$cate_id=$v['cate_id'];
echo '<li>
<img src="/0920/static/img/' . $v['image'] . '">
<span>' . $v['name'] . '</span>
<p>' . $v['detail'] . '</p>
</li>';
}
}
echo '</ul><textarea name="desc" id="tt1">一时摸鱼一时爽，一直摸鱼一直爽！</textarea><br>
<button type="button" onclick="click_cc();">提交</button>
</div>';
?>
<script type="text/javascript" src="static/js/jquery-2.2.4.min.js"></script>
<script type="text/javascript">
function getQueryString(name) {
var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
var r = window.location.search.substr(1).match(reg);
if (r != null) {
return unescape(r[2]);
}
return null;
}
function click_cc() {
var textarea = $('#tt1').val();
var moc_id = getQueryString('mov_id');
var cate_id = $('h3[cate_id]').attr('cate_id');
$.post("common.php",{"textarea":textarea,"moc_id":moc_id,"cate_id":cate_id},function(res){
if(res.code == 222){
var comment = '<li><img src="/0920/static/img/'+res***g+'"><span>'+res.name+'</span><p>' + res.textarea + '</p></li>';
$('.comment>ul').append(comment);
confirm('评论保存成功 O!^O^!O');
}else{
alert('评论保存失败 ~~T_T~~');
}
},"json");
}
</script>
<!--底部版权-->
<div class="footer">
<p class="copyright"><?php echo $title['copy']; ?> © 版权所有</p>
</div>
</body>
</html>点击 "运行实例" 按钮查看在线实例
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