Breaking News: Grepper is joining You.com. Read the official announcement!

how to implement specification in java spring boot

Chamrong Thor answered on September 4, 2022 Popularity 4/10 Helpfulness 1/10

answer how to implement specification in java spring boot

related how to implement specification in java spring boot

how to implement specification in java spring boot

Comment

public interface RestaurantRepository extends JpaRepository<Restaurant, Long>,
                                              JpaSpecificationExecutor<Restaurant> {
    // old query methods omitted for brevity
}

Popularity 4/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

Closely Related Answers

how to implement specification in java spring boot

Comment

class RestaurantNameSpecification implements Specification<Restaurant> {

    private final String name;

    public RestaurantNameSpecification(String name) {
        this.name = name;
    }

    @Override
    public Predicate toPredicate(Root<Restaurant> restaurant, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        final var nameExpression = criteriaBuilder.lower(restaurant.get(Restaurant_.name));
        return criteriaBuilder.like(nameExpression, "%" + name.toLowerCase() + "%");
    }
}

Popularity 6/10 Helpfulness 2/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Comment

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-jpamodelgen</artifactId>
</dependency>

Popularity 7/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: spring-boot java

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Comment

class RestaurantTopRatedSpecification implements Specification<Restaurant> {

    public static final double MINIMAL_AVERAGE_RATING = 8.0;

    @Override
    public Predicate toPredicate(Root<Restaurant> restaurant, 
                                 CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        final var averageRating = criteriaBuilder.avg(restaurant.join(Restaurant_.RATINGS).get(Rating_.SCORE));
        final var topRatedPredicate = criteriaBuilder.greaterThanOrEqualTo(averageRating, MINIMAL_AVERAGE_RATING);
        query.groupBy(restaurant.get(Restaurant_.ID)).having(topRatedPredicate);

        return null;
    }
}

Popularity 4/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: spring-boot java

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Comment

public final class RestaurantSpecifications {

    private RestaurantSpecifications() {
    }

    public static Specification<Restaurant> hasTopRating() {
        return new RestaurantTopRatedSpecification();
    }
}

Popularity 5/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Comment

@Service
public class RestaurantService {

    private final RestaurantRepository restaurantRepository;
    // constructor ommited for brevity

    public List<Restaurant> findTopRated() {
        return restaurantRepository.findAll(where(hasTopRating()));
    }
}

Popularity 5/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Comment

@DataJpaTest
class RestaurantNameSpecificationTest {

    @Autowired
    private RestaurantRepository restaurantRepository;

    @BeforeEach
    void setup() {
        restaurantRepository.save(new Restaurant("Café Java"));
        restaurantRepository.save(new Restaurant("Spring Restaurant"));
        restaurantRepository.save(new Restaurant("Jakarta Restaurant"));
    }

    @Test
    void matchesName() {
        final var topRestaurants = restaurantRepository.findAll(
                where(nameIsLike("Restaurant"))
        );

        assertThat(topRestaurants, hasSize(2));
        assertThat(topRestaurants, contains(
                hasProperty("name", is("Spring Restaurant")),
                hasProperty("name", is("Jakarta Restaurant"))
        ));
    }
}

Popularity 5/10 Helpfulness 1/10 Language java

Source: jschmitz.dev

Tags: java spring-boot

Link to this answer
Share Copy Link

Contributed on Sep 04 2022

Chamrong Thor

0 Answers Avg Quality 2/10

how to implement specification in java spring boot

Contents

More Related Answers

how to implement specification in java spring boot

Closely Related Answers

how to implement specification in java spring boot

how to implement specification in java spring boot

how to implement specification in java spring boot

how to implement specification in java spring boot

how to implement specification in java spring boot

how to implement specification in java spring boot

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.