How to use hibernate @ naturalid in springboot?

Jiedao jdon 2021-05-04 17:29:44
use hibernate naturalid springboot


This is a Spring Boot Application cases , Show how to use Hibernate Mapping natural business keys   @NaturalId.

Key points :

1. In entity ( for example ,Product) in , The mark should be taken as a natural sign ID  Properties of ( Business key )  @NaturalId;  Usually , There is only one such attribute in an entity , however here Multiple attributes are also supported .

@Entity
public class Product implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    @NaturalId(mutable = false)
    @Column(nullable = false, updatable = false, unique = true, length = 50)
    private String code;
     // @NaturalId(mutable = false)
    // @Column(nullable = false, updatable = false, unique = true)
    // private Long sku;

For immutable id, Mark the column as @NaturalId(mutable = false) and @Column(nullable = false, updatable = false, unique = true, ...)

For variable id, Mark the column as @NaturalId(mutable = true) and  @Column(nullable = false, updatable = true, unique = true, ...)

2. Use nature id Cover equals() and hashCode()

  @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Product)) {
            return false;
        }
        Product naturalIdProduct = (Product) o;
        return Objects.equals(getCode(), naturalIdProduct.getCode());
        // including sku 
        // return Objects.equals(getCode(), naturalIdProduct.getCode())
            // && Objects.equals(getSku(), naturalIdProduct.getSku());
    }
    @Override
    public int hashCode() {
        return Objects.hash(getCode());
        // including sku
        // return Objects.hash(getCode(), getSku());
    }
    @Override
    public String toString() {
        return "Product{" + "id=" + id + ", name=" + name + ", code=" + code + '}';
        // including sku
        // return "Product{" + "id=" + id + ", name=" + name + ", code=" + code + ", sku=" + sku + '}';
    }

3.  Define a @NoRepositoryBean Interface ( for example NaturalRepository) To define two objects called findBySimpleNaturalId()and Methods findByNaturalId() 

@NoRepositoryBean
public interface NaturalRepository<T, NID extends Serializable> {
    // use this method when your entity has a single field annotated with @NaturalId
    Optional<T> findBySimpleNaturalId(NID naturalId);
     
    // use this method when your entity has more than one field annotated with @NaturalId
    Optional<T> findByNaturalId(Map<String, Object> naturalIds);        
}

4.  Provides an implementation of this interface ( for example , One NaturalRepositoryImpl Realization   ) Depend on Hibernate Of Session Realization bySimpleNaturalId(), and   byNaturalId() Method

@Repository
@Transactional(readOnly = true)
public abstract class NaturalRepositoryImpl<T, NID extends Serializable>
        implements NaturalRepository<T, NID> {
    @PersistenceContext
    private EntityManager entityManager;
    private final Class<T> entityClass;
    public NaturalRepositoryImpl(Class<T> entityClass) {
        this.entityClass = entityClass;
    }
    @Override
    public Optional<T> findBySimpleNaturalId(NID naturalId) {
        Optional<T> entity = entityManager.unwrap(Session.class)
                .bySimpleNaturalId(entityClass)
                .loadOptional(naturalId);
        return entity;
    }
    @Override
    public Optional<T> findByNaturalId(Map<String, Object> naturalIds) {
        NaturalIdLoadAccess<T> loadAccess
                = entityManager.unwrap(Session.class).byNaturalId(entityClass);
        naturalIds.forEach(loadAccess::using);
        return loadAccess.loadOptional();
    }
}

For entities , Write extended repository classes ( for example , be used for Product Entity write   ProductNaturalRepository)NaturalRepositoryImpl And use it to set the entity class type and nature id type ( When entities use multiple natures ID when , The type is no longer relevant , Just set it to Serializable)

45  Inject this class into your service and call findBySimpleNaturalId() or  findByNaturalId()

The source code can be Get... Here .

版权声明
本文为[Jiedao jdon]所创,转载请带上原文链接,感谢
https://javamana.com/2021/05/20210504172656715n.html

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