消息推送系统

interface MessageService {

void sendMessage(String message, String recipient);

List getMessages(String user);

}

CREATE TABLE messages (

id INT AUTO_INCREMENT PRIMARY KEY,

sender VARCHAR(255),

recipient VARCHAR(255),

content TEXT,

status ENUM('sent', 'received', 'read') DEFAULT 'sent'

);

CREATE TABLE trademarks (

id INT AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(255) NOT NULL UNIQUE,

description TEXT,

registrationDate DATE

);

// 注册商标

public void registerTrademark(String trademarkName, String description, Date registrationDate) {

Trademark trademark = new Trademark(trademarkName, description, registrationDate);

trademarksRepository.save(trademark);

}