phpcms数据库优化

-- 示例：优化SQL语句
-- 原始SQL
SELECT * FROM articles WHERE category = 'tech' AND status = 'published';

-- 优化后的SQL
SELECT id, title, content FROM articles WHERE category = 'tech' AND status = 'published';

// 示例：使用PDO连接池
try {
    $pdo = new PDO('mysql:host=localhost;dbname=phpcms', 'username', 'password');
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}

-- 示例：优化表结构
-- 原始表结构
CREATE TABLE articles (
    id INT PRIMARY KEY,
    title VARCHAR(255),
    content TEXT,
    category_id INT,
    category_name VARCHAR(255)
);

-- 优化后的表结构
CREATE TABLE articles (
    id INT PRIMARY KEY,
    title VARCHAR(255),
    content TEXT,
    category_id INT,
    FOREIGN KEY (category_id) REFERENCES categories(id)
);

CREATE TABLE categories (
    id INT PRIMARY KEY,
    name VARCHAR(255)
);