CODEWITHSUNDEEP
javaspring-bootspring-data-jpa
WeiTang Lau
WeiTang Lau

Reputation: 123

Spring Data JPA Find By List of Objects

Given the following schema,

public class Product {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String productName;

    private String category; 

    private String vendorName;

// Constructor, getters and setters
}

I would like to find all products that equals to any pair of category and vendorName I have created a class for this

public class FilterRequest {
    private String vendorName;
    private String category;

// Constructors, getters and setters
}

Ideally the repo should have the following signature,

@Query(---QUERY---)
List<Product> findAllByFilterRequestList(List<FilterRequest> filterRequests);

Any idea how I should approach this? I am thinking of doing this one by one, but it will affect the performance.

Upvotes: 1

Views: 5433

Answers (1)

Donato Amasa
Donato Amasa

Reputation: 856

You can try to use QueryDSL that uses predicate to filter out the products using the list of FilterRequest

Service

public List<Product> getAllProductsByFilterRequests(List<FilterRequest> filterRequests) {
    BooleanBuilder booleanBuilder = new BooleanBuilder();
    filterRequests.forEach(
            filterRequest -> {
                    BooleanBuilder booleanBuilder2 = new BooleanBuilder();
                    booleanBuilder2.and(QProduct.product.category.eq(filterRequest.category));
                    booleanbuilder2.and(QProduct.product.vendorName.eq(filterRequest.vendorName));
                    booleanBuilder.or(booleanBuilder2);
            }
    );
    Predicate predicate = booleanBuilder.getValue();
    return (List<Product>) productRepository.findAll(predicate);
}

As you can see, booleanBuilder is the main predicate that aggregates the other predicate booleanBuilder2. booleanBuilder2 is the one that checks if both vendorName and category values are equal with the product.

Repository

@Repository
public interface ProductRepository extends JpaRepository<Product, Long>, QuerydslPredicateExecutor<Product> {}

Upvotes: 2

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