首先，您应该将数据库凭据保存在一个单独的 PHP 文件中，该文件位于 Web 无法访问的文件夹中，例如 ~/lib/db.php
<?php
define('SQL_HOST', 'localhost');
define('SQL_DATABASE', 'your-db-name');
define('SQL_USER', 'your-db-user');
define('SQL_PASS', 'your-db-password');
?>
然后是你的数据库类（也在 ~/lib 中）：
<?php
require_once('~/lib/db.php');
require_once('~/lib/BlogData.php');
class Database
{
protected $db = null;
function __construct()
{
// db connection options
$driverOptions = array(
PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'",
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
PDO::ATTR_EMULATE_PREPARES => false
);
// set new connection
$this->db = PDO(
"mysql:dbname=".SQL_DATABASE.";host=".SQL_HOST,
SQL_USER, SQL_PASS, $driverOptions
);
}
// This function lets you fetch blog data using any sort order you'd like and any WHERE criteria you want
function getBlogData($where = "1", $orderBy = "id DESC")
{
$stmt = $this->db->prepare("
SELECT *
FROM {'blogdata'} WHERE $where
ORDER BY $orderBy
");
$blogData = Array();
if ($stmt->execute())
{
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$oneBlogData = new BlogData($this);
$oneBlogData->init($row);
$blogData[] = $oneBlogData;
}
}
return $blogData;
}
function insertBlogData(BlogData $blogData)
{
$stmt = $this->db->prepare("
INSERT INTO {'blogdata'} (title , category , content) VALUES
(:title, :category, :content);
");
$stmt->bindParam(':title', $blogData->title, PDO::PARAM_STR);
$stmt->bindParam(':category', $blogData->category, PDO::PARAM_STR);
$stmt->bindParam(':content', $blogData->content, PDO::PARAM_STR);
$stmt->execute();
}
}
?>
然后我会为你的博客数据定义另一个类：
<?php
class BlogData {
public $title;
public $category;
public $content;
private $db;
function __construct(Database $db)
{
$this->db = $db;
}
function init($dbRow)
{
$this->title = $dbRow['title'];
$this->category = $dbRow['category'];
$this->content = $dbRow['content'];
}
function save()
{
// TODO: Write sql statement to save the row...
}
}
?>
然后您的第一段代码可以创建一个新的 BlogData 条目，如下所示：
<?php
require_once('~/lib/Database.php');
$db = new Database();
if(isset($_POST["submit"]))
{
$blogData = new BlogData($db);
$blogData->title = $_POST["title"];
$blogData->category = $_POST["category"];
$blogData->content = $_POST["content"];
$db->insertBlogData($blogData);
}
?>
您的第二个代码块可能如下所示：
<?php
require_once('~/lib/Database.php');
$db = new Database();
$blogDataArray = $db->getBlogData("1", "id DESC");
echo "<table border = '1'>";
foreach($blogDataArray as $blogData)
{
echo "<tr><td>" . $blogData->title . "</td><td>" . $blogData->category . "</td></tr>";
echo "<tr><td colspan='2'>" . $blogData->content . "</td></tr>";
}
echo "</table>";
?>
这也使得修改 BlogData 条目变得非常容易 - 只需使用 getBlogData 函数从数据库中获取博客数据，只需更改对象的值并调用 save 即可修改对象。例如：
<?php
// ...
$newContent = "New Content";
$blogData = $db->getBlogData("id='1'");
$blogData->content = $newContent;
$blogData->save();
?>
我还应该指出，您的博客数据条目需要一些独特的字段。有了一些 id，写 addToDatabase 并保存在一个函数中会更容易。