ider ssm增删改查

SSM是指Spring+SpringMVC+MyBatis的框架组合，用于开发Java Web应用程序。下面是SSM框架下的增删改查操作示例：

1. 实体类定义：

public class User {
    private int id;
    private String name;
    private int age;
    // getter和setter方法省略
}

2. Dao层操作接口：

public interface UserDao {
    // 添加用户
    int addUser(User user);
    // 根据id删除用户
    int deleteUserById(int id);
    // 更新用户信息
    int updateUser(User user);
    // 根据id查询用户
    User getUserById(int id);
    // 查询所有用户
    List<User> getAllUsers();
}

3. Dao层操作实现：

@Repository
public class UserDaoImpl implements UserDao {

    @Autowired
    private SqlSessionTemplate sqlSessionTemplate;

    @Override
    public int addUser(User user) {
        return sqlSessionTemplate.insert("addUser", user);
    }

    @Override
    public int deleteUserById(int id) {
        return sqlSessionTemplate.delete("deleteUserById", id);
    }

    @Override
    public int updateUser(User user) {
        return sqlSessionTemplate.update("updateUser", user);
    }

    @Override
    public User getUserById(int id) {
        return sqlSessionTemplate.selectOne("getUserById", id);
    }

    @Override
    public List<User> getAllUsers() {
        return sqlSessionTemplate.selectList("getAllUsers");
    }
}

4. Service层操作接口：

public interface UserService {
    // 添加用户
    boolean addUser(User user);
    // 根据id删除用户
    boolean deleteUserById(int id);
    // 更新用户信息
    boolean updateUser(User user);
    // 根据id查询用户
    User getUserById(int id);
    // 查询所有用户
    List<User> getAllUsers();
}

5. Service层操作实现：

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserDao userDao;

    @Override
    public boolean addUser(User user) {
        int result = userDao.addUser(user);
        return result > 0;
    }

    @Override
    public boolean deleteUserById(int id) {
        int result = userDao.deleteUserById(id);
        return result > 0;
    }

    @Override
    public boolean updateUser(User user) {
        int result = userDao.updateUser(user);
        return result > 0;
    }

    @Override
    public User getUserById(int id) {
        return userDao.getUserById(id);
    }

    @Override
    public List<User> getAllUsers() {
        return userDao.getAllUsers();
    }
}

6. Controller层操作：

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    // 添加用户
    @RequestMapping(value = "/user", method = RequestMethod.POST)
    public String addUser(User user) {
        boolean result = userService.addUser(user);
        if (result) {
            return "success";
        } else {
            return "error";
        }
    }

    // 删除用户
    @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE)
    public String deleteUserById(@PathVariable int id) {
        boolean result = userService.deleteUserById(id);
        if (result) {
            return "success";
        } else {
            return "error";
        }
    }

    // 更新用户信息
    @RequestMapping(value = "/user", method = RequestMethod.PUT)
    public String updateUser(User user) {
        boolean result = userService.updateUser(user);
        if (result) {
            return "success";
        } else {
            return "error";
        }
    }

    // 根据id查询用户
    @RequestMapping(value = "/user/{id}", method = RequestMethod.GET)
    public String getUserById(@PathVariable int id, Model model) {
        User user = userService.getUserById(id);
        model.addAttribute("user", user);
        return "user";
    }

    // 查询所有用户
    @RequestMapping(value = "/users", method = RequestMethod.GET)
    public String getAllUsers(Model model) {
        List<User> users = userService.getAllUsers();
        model.addAttribute("users", users);
        return "users";
    }
}

以上就是一个简单的SSM框架下的增删改查操作示例。