Customer Entity (Parent Entity)
#Entity
public class Customer {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
#OneToMany(mappedBy="customer", cascade=CascadeType.ALL)
private List<Facility> facilities;
//Setter and Getter for name and facilities
public void addFacility(Facility facility){
if(this.facilities == null){
this.facilities = new ArrayList<Facility>();
}
this.facilities.add(facility);
facility.setCustomer(this);
}
}
Facility Entity (Child Entity)
#Entity
public class Facility {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
#JoinColumn(name="CUSTOMER_FK")
private Customer customer;
private String name;
//Setter and Getter, equals and hashcode
...
}
in Customer entity, I use CascadeType.ALL, however when I remove a customer, the associated facilities are still there. I delete customer by
Query query = em.createNamedQuery("Customer.delete");
query.setParameter("id", customerId);
query.executeUpdate();
where
#NamedQuery(name="Customer.delete", query="delete from Customer c where c.id = :id")
Bulk delete operations are not cascaded, per JPA specification:
4.10 Bulk Update and Delete Operations
...
A delete operation only applies to
entities of the specified class and
its subclasses. It does not cascade to
related entities.
...
If you want to benefit from cascading, load the entity and then call EntityManager#remove(Object) on it.
Try with:
#Inject
EntityManager em;
Customer customer =...;
em.remove(customer);
This always cascades operations.
Related
I have an issue trying to generate multiple relationship in JPA with three Entities.
Order
Product
Modifier
I have an Entity to handle the relationship many to many.
OrderProducts (order_id and product_id)
Contains the relationship of one order can have multiple products
OrderDetails (order_products_id and modifier_id)
Contains the id of the previous relationship Order-Products and the Id of the modifier which is a set of multiple values that can affect the price of the product.
Not quite sure how to handle this kind of relationship in JPA as I'm new to it.
You need a join entity with a composite key. You will need to research it further.
Your entities:
#Entity
#Table(name = "ordertable")
#Data
public class Order {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#OneToMany(mappedBy = "order")
#EqualsAndHashCode.Exclude
private Set<OrderProductModifier> products;
}
#Entity
#Table(name = "product")
#Data
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#EqualsAndHashCode.Exclude
private BigDecimal unitPrice;
}
#Entity
#Table(name = "modifier")
#Data
public class Modifier {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#EqualsAndHashCode.Exclude
private BigDecimal modifier;
}
And the entity that ties it all together will need to have the foreign keys for each of the above entities, as you have noted.
#Entity
#Table(name = "orderproductmodifier")
#Data
public class OrderProductModifier {
#EmbeddedId
private OrderProductModifierId id;
#MapsId("orderId")
#ManyToOne
#EqualsAndHashCode.Exclude
#ToString.Exclude
private Order order;
#MapsId("productId")
#ManyToOne
#EqualsAndHashCode.Exclude
private Product product;
#MapsId("modifierId")
#ManyToOne
#EqualsAndHashCode.Exclude
private Modifier modifier;
}
#SuppressWarnings("serial")
#Embeddable
#Data
public class OrderProductModifierId implements Serializable {
private Long orderId;
private Long productId;
private Long modifierId;
}
This is pretty simple to use:
private void run() {
EntityManagerFactory factory = Persistence.createEntityManagerFactory("UsersDB");
EntityManager em = factory.createEntityManager();
em.getTransaction().begin();
Product product = new Product();
product.setUnitPrice(BigDecimal.TEN);
em.persist(product);
Modifier modifier = new Modifier();
modifier.setModifier(new BigDecimal(".90"));
em.persist(modifier);
Order order = new Order();
em.persist(order);
OrderProductModifier opm = new OrderProductModifier();
opm.setId(new OrderProductModifierId());
opm.setOrder(order);
opm.setProduct(product);
opm.setModifier(modifier);
em.persist(opm);
em.getTransaction().commit();
em.clear();
Order o = em.createQuery("select o from Order o join fetch o.products where o.id = 1", Order.class).getSingleResult();
System.out.println("Order for " + o.getProducts());
System.out.println("Order cost " + o.getProducts().stream().map(p->p.getProduct().getUnitPrice().multiply(p.getModifier().getModifier()).doubleValue()).collect(Collectors.summingDouble(Double::doubleValue)));
}
The above query could be better, but that will give you something to work on.
I have theses entity and I do this query.
select r from RentAmount r Join r.lodger l join l.bailList b where r.unpaidBalance > 0 and (r.paymentDueDate > :date or r.paymentDueDate is null ) and b.paymentPeriod= order by r.rentAmountId")
Is there a way to feed Lodger.bailList only with the last bail or i would need to loop on every record to get this information?
#Entity
public class RentAmount {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long rentAmountId;
#OneToOne
private Lodger lodger;
}
#Entity
public class Lodger{
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long lodgerId;
#OneToOne(fetch = FetchType.LAZY, mappedBy="lodger")
private RentAmount rentAmount;
#OneToMany(cascade = {CascadeType.PERSIST, CascadeType.MERGE}, fetch = FetchType.LAZY, mappedBy = "lodger", orphanRemoval = true)
private List<Bail> bailList;
}
#Entity
public class Bail {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long bailId;
#Enumerated(EnumType.STRING)
private PaymentPeriodEnum paymentPeriod;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name = "lodger_id")
private Lodger lodger;
}
There are a few options:
One (Non JPA, Hibernate Only)
Ensure the collection is correctly ordered and mark it is as extra lazy. You will have access to the whole collection but accessing of individual items will not trigger a full load.
https://docs.jboss.org/hibernate/orm/3.3/reference/en/html/performance.html
"Extra-lazy" collection fetching: individual elements of the
collection are accessed from the database as needed. Hibernate tries
not to fetch the whole collection into memory unless absolutely
needed. It is suitable for large collections.
The mapping will look like:
#OneToMany(mappedBy = "lodger")
#LazyCollection(LazyCollectionOption.EXTRA)
#OrderBy("theRelevantProperty ASC")
private List<Bail> bailList;
public void getCurrentBail(){
//will only load this item from the database
return bailList.get(bailList.size() - 1);
}
Two (Non JPA, Hibernate Only.)
Use the #Where annotation to filter the collection so that while still #OneToMany, only one element will be accessible.
https://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-hibspec-collection
The mapping will look like:
#OneToMany(mappedBy = "lodger")
#Where(clause="some native sql which will filter to include onyl 1item"))
private List<Bail> bailList;
public void getCurrentBail(){
//will be the only item accessible
return bailList.get(0);
}
Three (JPA Compliant)
Would involve creating views at the database level. Various options in this area. If we are only ever interested in the current bail then this view would be similar to option 2 above. Simply point the Bail entity to this view rather than the concrete table:
#Entity
#Table(name = "vw_active_bail")
public class Bail {
}
This is my sample schema and I have generated jpa entities in eclipse.
I am using spring jpa repositories. I want to know if I need to create repository interface for student course table.
I am having doubt over addStudentCourse method of both student and course entity classes. List studentCourses will be always null for new entity, how can I fill student course table while registering student information in system i.e save method on studentRepository.
Student.java
#Entity
#NamedQuery(name="Student.findAll", query="SELECT s FROM Student s")
public class Student implements Serializable {
private static final long serialVersionUID = 1L;
#Id
private long studentid;
private String studentname;
//bi-directional many-to-one association to StudentCourse
#OneToMany(mappedBy="student")
private List<StudentCourse> studentCourses;
........
public StudentCourse addStudentCourse(StudentCourse studentCourse) {
getStudentCourses().add(studentCourse);
studentCourse.setStudent(this);
return studentCourse;
}
public StudentCourse removeStudentCourse(StudentCourse studentCourse) {
getStudentCourses().remove(studentCourse);
studentCours.setStudent(null);
return studentCourse;
}
Course.java
#Entity
#NamedQuery(name="Course.findAll", query="SELECT c FROM Course c")
public class Course implements Serializable {
private static final long serialVersionUID = 1L;
#Id
private long courseid;
private String coursename;
//bi-directional many-to-one association to StudentCourse
#OneToMany(mappedBy="course")
private List<StudentCourse> studentCourses;
public StudentCourse addStudentCourse(StudentCourse studentCourse) {
getStudentCourses().add(studentCourse);
studentCourse.setCourse(this);
return studentCourse;
}
public StudentCourse removeStudentCourse(StudentCourse studentCourse) {
getStudentCourses().remove(studentCourse);
studentCourse.setCourse(null);
return studentCourse;
}
StudentCourse.java
#Entity
#Table(name="STUDENT_COURSE")
#NamedQuery(name="StudentCourse.findAll", query="SELECT s FROM StudentCourse s")
public class StudentCourse implements Serializable {
private static final long serialVersionUID = 1L;
#EmbeddedId
private StudentCoursePK id;
private String status;
//bi-directional many-to-one association to Course
#ManyToOne
#JoinColumn(name="COURSEID")
private Course course;
//bi-directional many-to-one association to Student
#ManyToOne
#JoinColumn(name="STUDENTID")
private Student student;
...
}
StudentCoursePK.java
#Embeddable
public class StudentCoursePK implements Serializable {
//default serial version id, required for serializable classes.
private static final long serialVersionUID = 1L;
#Column(insertable=false, updatable=false)
private long studentid;
#Column(insertable=false, updatable=false)
private long courseid;
...
}
If I understood your question correctly what you want to do is to be able to save a student from the save method in StudentRepository, and that this inserts/updates the student and also inserts/updates the join table.
Since the Student entity is not the owning side (it's mapped by "student" in StudentCourse), saving a Student will not trigger a save on StudentCourse. To do so you can add a cascade property the list for insert, update... or just for everything:
#OneToMany(mappedBy="student", cascade = CascadeType.ALL)
private List<StudentCourse> studentCourses = new ArrayList<StudentCourse>();
Then you could a method on your #Service class that looks like this:
#Transactional
public void enrollInCourse(Student student, Course course) {
StudentCourse sc = new StudentCourse();
sc.setStudent(student);
sc.setCourse(course);
sc.setStatus("Enrolled");
student.getStudentCourses().add(sc);
studentRepository.save(student);
}
This will also populate the StudentCourse table.
So there's no need for a repository, although if the cascade doesn't work as expected you could create one and save the StudentCourse entity yourself manually.
If this does not work you could try changing your mappings. For n-ary relationships or join tables with extra columns I always define the #ManytoOne relationships inside the #Embeddable class, and in the entity that represents the join table I define getters as #Transient to allow access to the mapped objects which are inside the embedded composite Id.
You can see an example here, and a blog post about this approach here.
the old issue description is obsolete
#unwichtich thank you for your tip, it helped get rid of that nasty error.
I have the entities:
#Entity
#XmlRootElement
#Table(name="WAITERENTITY")
public class WaiterEntity implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
#OneToMany(cascade = CascadeType.ALL, orphanRemoval=true, fetch = FetchType.EAGER)
#JoinColumn(name = "waiter_id")
private List<OrderEntity> orders = new ArrayList<>();
{plus usual setters and getters}
}
and
#Entity
#XmlRootElement
#Table(name="ORDERENTITY")
public class OrderEntity implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private long orderNumber;
#ManyToOne (cascade = CascadeType.ALL)
#JoinColumn (name = "table_id")
private TableEntity table_;
private int sumOfMoney = 0;
private boolean finalized = false;
#OneToMany(cascade = CascadeType.ALL, orphanRemoval=true, fetch = FetchType.LAZY)
#JoinColumn(name = "order_id")
private List<OrderItemEntity> orderItems = new ArrayList<>();
#ManyToOne (cascade = CascadeType.ALL)
#JoinColumn (name = "waiter_id")
private WaiterEntity waiter;
{plus usual setters and getters}
}
But the main problem remains. In the database, everything is as it should be:
<waiterEntities>
<waiterEntity>
<id>9</id>
<name>Jack Marston #499</name>
</waiterEntity>
<waiterEntity>
<id>10</id>
<name>Abigail Marston</name>
</waiterEntity>
</waiterEntities>
<orderEntities>
<orderEntity>
<finalized>false</finalized>
<orderNumber>12</orderNumber>
<sumOfMoney>0</sumOfMoney>
<waiter>
<id>9</id>
<name>Jack Marston #499</name>
</waiter>
</orderEntity>
</orderEntities>
But the #OneToMany relation of WaiterEntity does only return an empty list when waiter.getOrders() is called.
The method that creates a new OrderEntity is the following:
public void create(OrderEntity e) {
WaiterEntity waiter = em.find(WaiterEntity.class, e.getWaiter().getId());
if (waiter != null) {
(1) e.setWaiter(waiter);
em.persist(e);
System.out.println("after persist:\n" + e);
(2) //waiter.getOrders().add(e);
(3) //em.merge(waiter);
}
}
Edit: I observed very strange behaviour. Firstly, if the lines marked with (2) and (3) are un-commented, no OrderEntity will be persisted at all. Secondly, only the following outside statements will suffice GlassFish to persist an OrderEntity:
WaiterBean waiter = client.findByNameSingle(WaiterBean.class, "John Marston");
client.create(new OrderBean(waiter));
Where create will get an unique id of the respective WaiterEntity from the database. On the other hand, an OrderEntity will be not persisted, if no WaiterEntity id is known, as in for example:
client.create(new OrderBean(new WaiterBean("Hans")));
because this new object is not obtained from the database. The strage behaviour appears, when line marked with (1) is commented out: the first statement, with the previous obtainment of the respective WaiterEntity from the database won't work, but the second statement, that doesn't obtain any WaiterEntity from the database, will work and create an OrderEntity entry in the database. I really have a hard time understanding that.
The two commented lines (2) and (3) should assure that the WaiterEntity knows its OrderEntitys for later retrieval. But the only thing that these two lines do (or one of them, i tried that as well) is preventing any OrderEntity to be persisted into the database. It just won't do anything, and no further errors are reported, which drives me nuts...
Any ideas? Thanks in advance!
Just a quick guess is that you are adding the wrong OrderEntity instance. If you pass an entity instance to em.merge() the EntityManager creates a new instance of your entity, copies the state from the supplied entity, and makes the new copy managed. You have to use the new copy in any further actions regarding this entity.
In code:
public void create(OrderEntity e) {
WaiterEntity waiter = em.find(WaiterEntity.class, e.getWaiter().getId());
e = em.merge(e);
if (waiter != null) waiter.getOrders().add(e);
}
i have two entities Customer and Order (trivial setters and getters excluded)
#Entity
public class Customer {
#GeneratedValue
#Id
private int id;
#OneToMany
List<Order> orderList;
}
#Entity
public class Order {
#GeneratedValue
#Id
private int id;
#ManyToOne
Customer customer;
private boolean paid;
public Order(Customer customer) {
this.customer = customer;
customer.getOrderList().add(this)
}
}
Now i want to set 'paid = true' for all the orders of a given customer
Below query seem to do the trick, but I get a feeling it is innefficient and the fact that i stored the reverse relationship in Customer.orderList hints that there should be some other way to do this.
UPDATE Order o SET o.paid = true WHERE EXISTS
(SELECT c.orderList FROM Customer c WHERE o MEMBER OF c.orderList AND c = :customer)
I'm using container managed transactions, glassfish and javaDb. But I'd prefer if improvements could be done in JPA/JPQL domain and not specific to container or db.
private id; ?? missed field type
Add to #OneToMany annotation,cascade = CascadeType.All
Customer entity = entityManager.find(Customer.class, id)
for (Order order : entity.getOrderList())
{
order.setPaid(true);
}
if you are using cantainer managed transaction then true will be saved to DB