I have this entity:
#Entity
#Table(name = "GDO.NEWS")
public class News implements Serializable, GenericType {
#Id
#Column(name="ID", insertable=true, updatable=false)
protected Integer id;
#OneToMany(fetch=FetchType.LAZY)
#JoinTable( name = "GDO.NEWS_FILTRO" , joinColumns = #JoinColumn(name = "ID_NEWS") ,
inverseJoinColumns = #JoinColumn(name= "ID_FILTRO", referencedColumnName = "ID_FILTRO") )
private Set<FiltroRegione> filtroRegione;
}
With a OneToMany relation to this entity:
#Entity
public class FiltroRegione extends AbstractFiltro {
//... does not matter
}
that extends this class:
#Entity
#Table(name = "GDO.FILTRO")
#Inheritance(strategy = InheritanceType.SINGLE_TABLE)
#DiscriminatorColumn(name = "CLASSE_FILTRO", discriminatorType=DiscriminatorType.STRING)
public class AbstractFiltro implements java.io.Serializable, GenericType {
private static final long serialVersionUID = 1L;
#Id
#Column(name="ID_FILTRO", insertable=true, updatable=false)
private Integer id;
#Column(name="TIPO_FILTRO")
protected String tipoFiltro;
public AbstractFiltro() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
The point is the #OneToMany association in News entity returns not only the FiltroRegione entities, but entities of all the subclasses of AbstractFiltro (they share the same database table GDO.FILTRO, but there is a discriminator column).
I think the problem is the #JoinTable, it ignores the discriminator column and just fetch all the records from the table GDO.FILTRO if there is a record in the join table GDO.NEWS_FILTRO associating a record from GDO.NEWS with a record from GDO.FILTRO.
Obviously I would like my Set< FiltroRegione > being populated only by FiltroRegione entities, entities stored in GDO.FILTRO with "FiltroRegione" as value of the discriminator column. How can i obtain such behaviour?
I am forced to use OpenJpa 1.x, supporting JPA 1.0 specs
Related
I'm working on a Spring-Boot project with a H2 database. I have two entities Portfolio and Report, and there is a many-to-many association between the two.
I want those entities to be audited, so I followed this tutorial to audit through an AuditorAware interface with custom fields.
The two entities are well audited, the columns are created in the database. However, the join table portfolio_reports is not audited. How can I audit the join table as well ?
Portfolio.java
#Entity
#Table(name = "portfolio")
public class Portfolio extends Auditable<String> implements Serializable {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "name")
#Unique
private String name;
#ManyToMany(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
#JoinTable(name = "portfolio_report", joinColumns = #JoinColumn(name = "portfolio_id"), inverseJoinColumns = #JoinColumn(name = "report_id"))
private List<Report> reports;
// Getters and setters
}
Report.java
#Entity
#Table(name = "report")
public class Report extends Auditable<String> implements Serializable {
#Id
#Column(name = "id")
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(name = "axioma_id")
private Long axiomaId;
#Column(name = "name")
private String name;
#AuditJoinTable
#ManyToMany(mappedBy = "reports", cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
private List<Portfolio> portfolios;
// Getters and setters
}
Auditable.java
#MappedSuperclass
#EntityListeners(AuditingEntityListener.class)
public abstract class Auditable<U> {
#Version
#Column(name = "version_no")
protected Long versionNo;
#CreatedDate
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "created_date")
protected Date createdDate;
#LastModifiedDate
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "modified_date")
protected Date modifiedDate;
}
AuditorAwareImpl.java
public class AuditorAwareImpl implements AuditorAware<String> {
#Override
public Optional<String> getCurrentAuditor() {
return Optional.of("Admin");
}
}
PersistenceConfiguration.java
#Configuration
#EnableJpaAuditing(auditorAwareRef = "auditorAware")
public class PersistenceConfiguration {
#Bean
public AuditorAware<String> auditorAware() {
return new AuditorAwareImpl();
}
}
Problem:
Clearly here Auditable should add some column to your intermediate table that maintains relation between Portfolio and Report and that table is created behind the scene and you don't have access to that table in your program. Only hibernate can use that table to maintain relation between your entities and do join operation.
Solution:
Here you should make Join table that maintain Many to Many relation between Portfolio and Report explicit so that you can have entity like PortfolioReport in your program that can extends from Auditable. Please read the following post to see how to do that: The best way to map a many-to-many association with extra columns when using JPA and Hibernate
I have an entity:
#Entity
#Table(name = "person")
public class Person {
#EmbeddedId
private PersonId id;
#OnDelete(action = OnDeleteAction.CASCADE)
#MapsId("a_phoneNumberId")
#ManyToOne
private PhoneNumber phoneNumber;
#OnDelete(action = OnDeleteAction.CASCADE)
#MapsId("b_addressId")
#ManyToOne
private Address address;
...
with embedded id:
#Embeddable
public class PersonId implements Serializable {
private int a_phoneNumberId;
private int b_addressId;
...
Note: a_ and b_ prefixes are used to order columns in primary key.
Everything works as expected and hibernate generates a table with columns: phoneNumber_id and address_id.
Is it possible to rename those columns, as I want to have a snake_case name - phone_number_id?
So far I tried
#AttributeOverride annotation:
#Entity
#Table(name = "person")
public class Person {
#EmbeddedId
#AttributeOverrides({
#AttributeOverride(name = "a_phoneNumberId", column = #Column(name = "phone_number_id"))
})
private PersonId id;
#Column annotation for the id:
#Embeddable
public class PersonId implements Serializable {
#Column(name = "phone_number_id")
private int a_phoneNumberId;
but it changed nothing.
I have a problem with retrieving an entity using the child's entity as a search parameter. Entities are related to many to one relationship as unidirectional and each object is fetched as FetchType.LAZY.
When I looking for an entity by a child entity, the result is null. But when I set to fetch as Eager it is correct.
My Entities:
#NoArgsConstructor
#Getter
#Entity
#Table(name = "partner")
public class PartnerEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String login;
public PartnerEntity(String login) {
this.login = login;
}
}
#NoArgsConstructor
#Getter
#Entity
#Table(name = "point")
public class PointEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "partner_Id")
private PartnerEntity partnerEntity;
public PointEntity(PartnerEntity partnerEntity) {
this.partnerEntity = partnerEntity;
}
}
#NoArgsConstructor
#Getter
#Entity
#Table(name = "orer")
public class OrdEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "PAYMENT_POINT_ID")
private PointEntity pointEntity;
public OrdEntity(PointEntity pointEntity) {
this.pointEntity = pointEntity;
}
}
#NoArgsConstructor
#ToString
#Getter
#Entity
#Table(name = "BL")
public class BLEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "PARTNER_LOGIN", referencedColumnName = "login")
private PartnerEntity partnerEntity;
private String number;
public BLEntity(PartnerEntity partnerEntity, String number) {
this.partnerEntity = partnerEntity;
this.number = number;
}
}
And I looking for BLEntity using OrdEntity child:
final OrdEntity byId = ordRepo.findById(id);
final PartnerEntity partnerEntity = order.getPointEntity().getPartnerEntity();
final BLEntity blEntityResult= blRepo.findOneByNumberAndPartner(number, partnerEntity);
The object partnerEntity is not null, it is correct object.
I got blEntityResult as null but if I change in PointEntity fetch to FetchType.EAGER, blEntityResult is not null(correct).
My custom query in repository below:
public interface BLRepo extends JpaRepository<BLEntity, Long> {
#Query("select b from BLEntity b where b.number = :number and b.partnerEntity= :partner")
BLEntity findOneByNumberAndPartner(#Param("number") String number, #Param("partner") PartnerEntity partner);
}
why does happens, if the partner object being downloaded is not null and is correct?
I think you should add the mapping in both sides,
because of default fetch type for #AllToMany=Lazy and #ManyToAll = Eager.
just add below code inside PartnerEntity.
#OneToMany(mappedBy="partnerEntity" , fetch = FetchType.Eager )
List<BLEntity> blEntity = new ArrayList<>();
I change FetchType into Eager in PointEntity:
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "partner_Id")
private PartnerEntity partnerEntity;
And everything is ok, but I don't understand why it does not work with PaymentType.Lazy. When I am looking for:
final PartnerEntity partnerEntity = order.getPointEntity().getPartnerEntity();
I get correct entity "PartnerEntity" which has proper login's field (login'field has value "test").
When I turned logged level to 'TRACE' I saw, Hibernate not binding correct login's parameter, it set null instead "test") why? :)
Suppose, we have two entities, first one:
#Entity
#Table(name = "entitya")
public class EntityA {
#Id
#Column(name = "id")
private Long id;
#Column(name = "name")
private Long name;
#OneToMany(mappedBy = "parent", fetch = FetchType.LAZY)
private Set<EntityB> childEntities;
}
and the second:
#Entity
#Table(name = "entityb")
public class EntityB {
#Id
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#Column(name = "master")
private Boolean master;
#ManyToOne
#JoinColumn(name = "parent")
private EntityA parent;
}
So far, so good. However underlying database tables and constrains enforce that for any entityA there can be only one EntityB with boolean field master set to true. I can extract it by adding following method to entityA:
public entityB getMasterChild() {
for(entityB ent : childEntities) {
if(ent.isMaster()) {
return ent;
}
}
}
The question is, can I create #OneToOne relationship in EntityA that can express that rule, so that entityA can have additional masterChild member of type entityB?
If I understood you correctly you want to create/define a relationship between two entities based on a value of some entity's property. The think is that relationship between entities is defined on entities count (how many entities can has the other entity) and not on some entity's property value.
However
If you really want to use #OneToOne mapping for masterChild I would recommend creating a separate table/entity for it. Once this is done, you can include this new MasterChild entity into EntityA and annotate it with #OneToOne.
Here is new MasterChild entity
#Entity
public class MasterChild extends EntityB{
#Id
#Column(name = "id")
private Long id;
}
Note that I have removed 'master' from EntityB as it is no longer needed
#Entity
#Table(name = "entityb")
public class EntityB {
#Id
#Column(name = "id")
private Long id;
#Column(name = "name")
private String name;
#ManyToOne
#JoinColumn(name = "parent")
private EntityA parent;
}
And here is modified EntityA
#Entity
#Table(name = "entitya")
public class EntityA {
#Id
#Column(name = "id")
private Long id;
#Column(name = "name")
private Long name;
#OneToOne
private MasterChild master;
#OneToMany(mappedBy = "parent", fetch = FetchType.LAZY)
private Set<EntityB> childEntities;
}
Have a problem persisting a ManyToMany relationship mapped like that
Document.java
public class Document {
.......
#ManyToMany(targetEntity = Category.class, cascade = CascadeType.ALL, fetch = FetchType.LAZY)
#JoinTable(name = "fideuram_gup_documents_in_categories",
joinColumns = #JoinColumn(name="fk_document"),
inverseJoinColumns = #JoinColumn(name = "fk_category"))
private Set<Category> categories = new HashSet<Category>();
.......
}
where Category is one more entity of my model which I don't paste here since it doesn't carry a reverse mapping of this relation, and has just an ID and a name.
When I try to persist Document however I get the following error:
org.hibernate.PropertyAccessException: could not get a field value by reflection getter of it.ardesia.fideuram.gup.model.Category.id
I've surfed the web about it but no page relates to ManyToMany relations. Of course all the ManyToOne relations I have on the entity Document work fine.
I'm using:
spring-data-jpa:1.2.0.RELEASE
hibernate-core:4.2.2.Final
hibernate-entitymanager:4.2.2.final
UPDATE
All entities expose a default constructor and getter/setter for every field. Or,more preciselt, I'm using Spring Roo for creating the entity and it injects getters and setters automatically upon compilation.
You can instrument Hibernate how it must access your property using #javax.persistence.Access annotation; put on your mapped class with #Access.value set to
AccessType.FIELD for direct field access
AccessType.PROPERTY for accessing properties using accessors
Maybe it can help you, I already did the same, I put my code, it creates a join table:
#Entity
#Table(name = "custom_pizza")
public class CustomPizza extends BaseEntity {
private static final long serialVersionUID = 1L;
// ManyToMany instead of oneToMany in order to don't have the unique
// constraint on each primary key of the join table
#ManyToMany(fetch = FetchType.LAZY)
#JoinTable(name = "custom_pizza_topping", joinColumns = #JoinColumn(name = "custom_pizza_id"), inverseJoinColumns = #JoinColumn(name = "topping_id"))
private Set<Topping> toppings = new HashSet<Topping>();
public void addTopping(Topping topping) {
toppings.add(topping);
}
public void removeTopping(Topping topping) {
toppings.remove(topping);
}
...
And my topping:
#Entity
#Table(name = "topping")
public class Topping extends BaseEntity {
private static final long serialVersionUID = 1L;
#Column(name = "name", nullable = false)
private String name;
#Column(name = "price", nullable = false)
private float price;
....
and the BaseEntity
#MappedSuperclass
public abstract class BaseEntity implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
#Column(name = "id")
private Long id;
...