Hibernate中复合主键的条件连接查询

Question

Need criteria join query for a composite primary key. Entities:

1. ArtWork

   @Entity @Table(name = "artwork") public class ArtWork implements io.malevich.web.entity.Entity { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Id @Column(name = "language", columnDefinition = "CHAR(2)") private String language; @Column(name = "art_name", nullable = false) private String artName; @Column(name = "creation_date", nullable = false) private Date creationDate; @Column(name = "edition_flag", nullable = false, columnDefinition = "tinyint(1)") private boolean editionFlag; @Column(name = "replica_flag", nullable = false, columnDefinition = "tinyint(1)") private boolean replicaFlag; @Column(name = "number_of_editions") private Long numberOfEditions; @Column(name = "original_id") private Long originalId; @ManyToOne @JoinColumns({ @JoinColumn( name = "category_id", referencedColumnName = "id", insertable = false, updatable = false), @JoinColumn( name = "language", referencedColumnName = "language", insertable = false, updatable = false) }) private Category category; @ManyToOne @JoinColumns({ @JoinColumn( name = "gallery_id", referencedColumnName = "id", insertable = false, updatable = false), @JoinColumn( name = "language", referencedColumnName = "language", insertable = false, updatable = false) }) private Gallery gallery; @ManyToOne private Specialization specialization; @ManyToOne @JoinColumns({ @JoinColumn( name = "author_id", referencedColumnName = "id", insertable = false, updatable = false), @JoinColumn( name = "language", referencedColumnName = "language", insertable = false, updatable = false) }) private Author author; @Column private String description; @Column private Double price; //getter setter }

2. User:

    @javax.persistence.Entity @Table(name = "user") public class User implements Entity, UserDetails { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(unique = true, length = 255, nullable = false) private String name; @Column(length = 255, nullable = false) private String password; @ElementCollection(fetch = FetchType.EAGER) private Set<Role> roles = new HashSet<>(); @Column(name = "user_type_id") private Long userTypeId; @ManyToOne @JoinColumn(name = "person_id", referencedColumnName = "id") private Person person; @ManyToOne @JoinColumn(name = "organization_id", referencedColumnName = "id") private Organization organization; @ManyToOne @JoinColumn(name = "file_id", referencedColumnName = "id") private File file; @Column(name = "activity_flag") private boolean activityFlag; //gettter and setter }

3. Account States

   @javax.persistence.Entity @Table(name = "account_states") public class AccountStates implements Entity { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(insertable = false, updatable = false) private String language; @ManyToOne @JoinColumns({ @JoinColumn(name = "artwork_id", referencedColumnName = "id"), @JoinColumn(name = "language", referencedColumnName = "language") }) private ArtWork artwork; @ManyToOne @JoinColumn(name = "art_owner_id", referencedColumnName = "id") private User artOwner; @Column(name = "quantity") private Long quantity; @Temporal(TemporalType.DATE) @Column(name = "buy_date") private Date buyDate; }

4. Account State Dao: public class JpaAccountStatesDao extends JpaDao implements AccountStatesDao {

    public JpaAccountStatesDao() { super(AccountStates.class); } @Override public AccountStates find(Long artOwnerId, Long artworkId, String language) { final CriteriaBuilder builder = this.getEntityManager().getCriteriaBuilder(); final CriteriaQuery<AccountStates> criteriaQuery = builder.createQuery(AccountStates.class); Root<AccountStates> root = criteriaQuery.from(AccountStates.class); Predicate p1 = builder.and(builder.equal(root.get("artwork"), artworkId), builder.equal(root.get("artwork"), language), builder.equal(root.get("artOwner"), artOwnerId)); criteriaQuery.where(p1); TypedQuery<AccountStates> typedQuery = this.getEntityManager().createQuery(criteriaQuery); return typedQuery.getSingleResult(); } }

I want to find Account States where artOwner id = 1 and language = en and artwork id = 1.

Can anyone suggest proper query for the same?

Answer 1

I found a solution for the same, I tried to pass a whole object instead of object id.

So final query is:

@Override
public AccountStates find(User artOwner, Artwork artwork) {


 final CriteriaBuilder builder = this.getEntityManager().getCriteriaBuilder();
    final CriteriaQuery<AccountStates> criteriaQuery = builder.createQuery(AccountStates.class);

    Root<AccountStates> root = criteriaQuery.from(AccountStates.class);
    Predicate p1 = builder.and(builder.equal(root.get("artwork"), artwork),
            builder.equal(root.get("artOwner"), artOwner));

    criteriaQuery.where(p1);

    TypedQuery<AccountStates> typedQuery = this.getEntityManager().createQuery(criteriaQuery);

    return typedQuery.getSingleResult();
    }
}

Now, It works successfully... thanks