怎么配置论坛数据库

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(50) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    email VARCHAR(100) NOT NULL UNIQUE
);

CREATE TABLE categories (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50) NOT NULL UNIQUE
);

CREATE TABLE posts (
    id INT AUTO_INCREMENT PRIMARY KEY,
    title VARCHAR(255) NOT NULL,
    content TEXT NOT NULL,
    author_id INT NOT NULL,
    category_id INT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (author_id) REFERENCES users(id),
    FOREIGN KEY (category_id) REFERENCES categories(id)
);

CREATE TABLE comments (
    id INT AUTO_INCREMENT PRIMARY KEY,
    content TEXT NOT NULL,
    user_id INT NOT NULL,
    post_id INT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id),
    FOREIGN KEY (post_id) REFERENCES posts(id)
);

sudo apt-get update
sudo apt-get install mysql-server

[mysqld]
bind-address = 127.0.0.1
port = 3306
datadir = /var/lib/mysql

sudo systemctl start mysql
sudo systemctl enable mysql

mysql -u root -p

CREATE DATABASE forum;
USE forum;

-- 创建表（如上所示）

<?php
$servername = "localhost";
$username = "root";
$password = "your_password";
$dbname = "forum";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
?>