Springboot monodb查询to筛选数据计数

// 实体类
@Document(collection = "users")
public class User {
    @Id
    private String id;
    private String name;
    private int age;
    // 省略getter和setter方法
}

// Repository接口
public interface UserRepository extends MongoRepository<User, String> {
    List<User> findByName(String name);
    
    @Query("{ age: { $gt: ?0 } }")
    List<User> findByAgeGreaterThan(int age);
    
    @Aggregation("{ $match: { age: { $gt: ?0 } } }, { $group: { _id: null, count: { $sum: 1 } } }")
    int countByAgeGreaterThan(int age);
}

// 调用查询方法
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    
    public List<User> getUsersByName(String name) {
        return userRepository.findByName(name);
    }
    
    public List<User> getUsersByAgeGreaterThan(int age) {
        return userRepository.findByAgeGreaterThan(age);
    }
    
    public int countUsersByAgeGreaterThan(int age) {
        return userRepository.countByAgeGreaterThan(age);
    }
}