以留言板为例。
数据表设计
分析数据表结构：有哪些信息需要存储：留言信息：ID，留言标题，留言内容，留言时间，留言人
CREATE TABLE message( id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY, title VARCHAR(120) NOT NULL DEFAULT ‘‘, content VARCHAR(255) NOT NULL DEFAULT ‘‘, created_at INT UNSIGNED NOT NULL DEFAULT ‘0‘, user_name VARCHAR(32) NOT NULL DEFAULT ‘‘, KEY message_user_name(user_name) )ENGINE=InnoDB DEFAULT CHARSET=utf8;
选择PHP连接数据库的方式
PDO：可扩展性更好，支持预处理，面向对象
MySQLi：只支持MySQL操作，支持预处理，面向对象和过程，效率较高
mysql：只支持MySQL数据库，没有预处理的支持，面向过程
PDO的基本操作：
<?php
try{
操作数据库代码
}catch(PDOException $e){
echo $e->getMessage();
}
操作数据库代码：
$pdo = new PDO($dsn, $username, $password, $attr); $sql = ‘SELECT id, title, content FROM message where user_name=:user_name‘; $stmt = $pdo->prepare($sql); $stmt->execute([ ‘:user_name‘ => $user_name]); $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
form.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>留言本</title>
</head>
<body>
<form action="store.php" method="post">
标题：<input type="text" name="title"><br>
内容：<textarea cols="35" rows="10" name="content"></textarea><br>
留言人：<input type="text" name="user_name"><br>
<input type="submit" value="添加">
</form>
</body>
</html>
store.php
<?php
$title = $_POST[‘title‘];
$content = $_POST[‘content‘];
$user_name = $_POST[‘user_name‘];
if(empty($title) || empty($content) || empty($user_name)){
exit(‘标题或者内容或者用户名不能为空‘);
}
try {
$dsn = ‘mysql:dbname=blog;host=localhost‘;
$username = ‘root‘;
$password = ‘rootroot‘;
$attr = [
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
];
$pdo = new PDO($dsn, $username, $password, $attr);
$sql = ‘insert into message(title, content, created_at, user_name) values(:title, :content, :created_at, :user_name)‘;
$stmt = $pdo->prepare($sql);
$data = [
‘:title‘ => $title,
‘:content‘ => $content,
‘:created_at‘ => time(),
‘:user_name‘ => $user_name
];
$stmt->execute($data);
$rows = $stmt->rowCount();
if($rows){
exit(‘添加成功‘);
}else{
exit(‘添加失败‘);
}
}catch (PDOException $e){
echo $e->getMessage();
}
无限分类表：1. id title pid/path order by排序
原文地址：https://www.cnblogs.com/cn-sbo/p/10839642.html
时间： 2024-10-14 02:48:48