如何使用Micronaut Data JDBC在存储库中创建简单的计数查询？

import io.micronaut.data.annotation.GeneratedValue;
import io.micronaut.data.annotation.Id;
import io.micronaut.data.annotation.MappedEntity;

@MappedEntity
public class UserEntity {

    @Id
    @GeneratedValue
    private Long id;

    private String name;
    private String email;

    // getters and setters
}

import io.micronaut.data.annotation.Query;
import io.micronaut.data.annotation.Repository;
import io.micronaut.data.repository.CrudRepository;

@Repository
public interface UserRepository extends CrudRepository<UserEntity, Long> {

    @Query("SELECT COUNT(*) FROM UserEntity")
    long countUsers();
}

import javax.inject.Inject;

public class UserService {

    @Inject
    private UserRepository userRepository;

    public long getUserCount() {
        return userRepository.countUsers();
    }
}