修改文件结构，统一文档格式

scripts/database/schema.sql

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+-- 创建数据库
+CREATE DATABASE IF NOT EXISTS nxxmdata CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+
+-- 使用数据库
+USE nxxmdata;
+
+-- 创建用户表
+CREATE TABLE users (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    email VARCHAR(100) UNIQUE NOT NULL,
+    password VARCHAR(255) NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+-- 创建角色表
+CREATE TABLE roles (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(50) UNIQUE NOT NULL,
+    description TEXT,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- 创建用户角色关联表
+CREATE TABLE user_roles (
+    user_id INT NOT NULL,
+    role_id INT NOT NULL,
+    assigned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (user_id, role_id),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+    FOREIGN KEY (role_id) REFERENCES roles(id) ON DELETE CASCADE
+);
+
+-- 创建产品表
+CREATE TABLE products (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(100) NOT NULL,
+    description TEXT,
+    price DECIMAL(10,2) NOT NULL,
+    stock INT DEFAULT 0,
+    status ENUM('active', 'inactive') DEFAULT 'active',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+);
+
+-- 创建订单表
+CREATE TABLE orders (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    user_id INT NOT NULL,
+    total_amount DECIMAL(10,2) NOT NULL,
+    status ENUM('pending', 'paid', 'shipped', 'delivered', 'cancelled') DEFAULT 'pending',
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- 创建订单项表
+CREATE TABLE order_items (
+    id INT PRIMARY KEY AUTO_INCREMENT,
+    order_id INT NOT NULL,
+    product_id INT NOT NULL,
+    quantity INT NOT NULL,
+    price DECIMAL(10,2) NOT NULL,
+    FOREIGN KEY (order_id) REFERENCES orders(id) ON DELETE CASCADE,
+    FOREIGN KEY (product_id) REFERENCES products(id) ON DELETE CASCADE
+);
+
+-- 插入基础角色数据
+INSERT INTO roles (name, description) VALUES 
+('admin', '系统管理员'),
+('user', '普通用户'),
+('guest', '访客');
+
+-- 插入示例用户数据
+INSERT INTO users (username, email, password) VALUES 
+('admin', 'admin@example.com', '$2b$10$rVHMOB./a2mFmE4EEdI3QO4f./bN3LYb.dpDvtX9gRUM9gNwspj1a'),
+('john_doe', 'john@example.com', '$2b$10$rVHMOB./a2mFmE4EEdI3QO4f./bN3LYb.dpDvtX9gRUM9gNwspj1a');
+
+-- 为示例用户分配角色
+INSERT INTO user_roles (user_id, role_id) VALUES 
+(1, 1), -- admin用户具有admin角色
+(2, 2); -- john_doe用户具有user角色
+
+-- 插入示例产品数据
+INSERT INTO products (name, description, price, stock) VALUES 
+('示例产品1', '这是一个示例产品', 99.99, 100),
+('示例产品2', '这是另一个示例产品', 149.99, 50);