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import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class MessageService {

    @Autowired
    private MessageRepository messageRepository;

    public Message saveMessage(String username, String content) {
        Message message = new Message();
        message.setUsername(username);
        message.setContent(content);
        return messageRepository.save(message);
    }

    public List<Message> getAllMessages() {
        return messageRepository.findAll();
    }
}



import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;

@Entity
public class Message {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String username;
    private String content;

    // Getters y Setters

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
    
}



import org.springframework.data.jpa.repository.JpaRepository;

public interface MessageRepository extends JpaRepository<Message, Long> {
}