|  |  | 
 |  |  | import org.springframework.beans.factory.annotation.Autowired; | 
 |  |  | import org.springframework.stereotype.Service; | 
 |  |  |  | 
 |  |  | import java.util.List; | 
 |  |  |  | 
 |  |  | @Service | 
 |  |  | public class UserServiceImpl implements IUserService { | 
 |  |  |      | 
 |  |  |     @Autowired | 
 |  |  |     private UserMapper userMapper; | 
 |  |  |      | 
 |  |  |      | 
 |  |  |  | 
 |  |  |     @Override | 
 |  |  |     public User getUser(String username, String password) { | 
 |  |  |         return userMapper.select(username, password); | 
 |  |  | 
 |  |  |         user.setPassword(password); | 
 |  |  |         return userMapper.update(user) > 0; | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |     @Override | 
 |  |  |     public User getUserByUsername(String username) { | 
 |  |  |         return userMapper.getUserByUsername(username); | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |     @Override | 
 |  |  |     public int addUser(User user) { | 
 |  |  |         User userByUsername = userMapper.getUserByUsername(user.getUsername()); | 
 |  |  |         if (userByUsername != null) return 0; | 
 |  |  |         return userMapper.add(user); | 
 |  |  |     } | 
 |  |  |     @Override | 
 |  |  |     public int deleteUser(int id) { | 
 |  |  |         return userMapper.delete(id); | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |     @Override | 
 |  |  |     public List<User> getAllUsers() { | 
 |  |  |         return userMapper.selectAll(); | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |     @Override | 
 |  |  |     public int updateUsers(User user) { | 
 |  |  |         return userMapper.update(user); | 
 |  |  |     } | 
 |  |  |  | 
 |  |  |  | 
 |  |  | } |