While learning JPA/Hibernate I stumbbled upon something unexpected. I am getting an unnecessary double select query to the db (see buttom).I have a simple OneToOne setup.
This is my Contact entity:
@Entity
@Table(name = "contact")
public class Contact {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "contact_id", nullable = false, insertable = false, updatable = false)
private Long id;
@Column(name = "name", nullable = false)
private String name;
@OneToOne
@JoinColumn(name="fk_address_id", referencedColumnName="address_id")
private Address address;
public Contact(String name, Address address) {
this.name = name;
this.address = address;
}
// getters/setters
}
My Address entity:
@Entity
@Table(name = "address")
public class Address {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "address_id", nullable = false, insertable = false, updatable = false)
private Long id;
@Column(name = "location", nullable = false)
private String location;
@OneToOne(mappedBy = "address")
private Contact contact;
public Address(String location) {
this.location = location;
}
// getters/setters
}
This is how I ran my code:
private EntityManager em;
@Before
public void setup() {
em = EntityManagerFactoryCreator.getEntityManagerFactory().createEntityManager();
}
@Test
public void createContactWithAddress() {
Address address = new Address("Made");
Contact contact = new Contact("Jan", address);
em.getTransaction().begin();
em.persist(address);
em.persist(contact);
em.getTransaction().commit();
em.close();
em = EntityManagerFactoryCreator.getEntityManagerFactory().createEntityManager();
Contact managedContact = em.find(Contact.class, 1L);
}
}
It is probably something stupid, but what is causing the double select?
Hibernate:
drop table address if exists
Hibernate:
drop table book if exists
Hibernate:
drop table contact if exists
Hibernate:
create table address (
address_id bigint generated by default as identity,
location varchar(255) not null,
primary key (address_id)
)
Hibernate:
create table book (
book_id bigint generated by default as identity,
category varchar(255),
release_date date,
summary varchar(255),
title varchar(255) not null,
primary key (book_id)
)
Hibernate:
create table contact (
contact_id bigint generated by default as identity,
name varchar(255) not null,
address_address_id bigint,
primary key (contact_id)
)
Hibernate:
alter table book
add constraint UK_g0286ag1dlt4473st1ugemd0m unique (title)
Hibernate:
alter table contact
add constraint FKrc0ixa9b11b9tv3hyq0iwvdpt
foreign key (address_address_id)
references address
Hibernate:
insert
into
address
(address_id, location)
values
(null, ?)
TRACE o.h.t.d.s.BasicBinder [main]: binding parameter [1] as [VARCHAR] - [Made]
Hibernate:
insert
into
contact
(contact_id, address_address_id, name)
values
(null, ?, ?)
TRACE o.h.t.d.s.BasicBinder [main]: binding parameter [1] as [BIGINT] - [1]
TRACE o.h.t.d.s.BasicBinder [main]: binding parameter [2] as [VARCHAR] - [Jan]
Hibernate:
select
contact0_.contact_id as contact_1_2_0_,
contact0_.address_address_id as address_3_2_0_,
contact0_.name as name2_2_0_,
address1_.address_id as address_1_0_1_,
address1_.location as location2_0_1_
from
contact contact0_
left outer join
address address1_
on contact0_.address_address_id=address1_.address_id
where
contact0_.contact_id=?
TRACE o.h.t.d.s.BasicBinder [main]: binding parameter [1] as [BIGINT] - [1]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([address_1_0_1_] : [BIGINT]) - [1]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([address_3_2_0_] : [BIGINT]) - [1]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([name2_2_0_] : [VARCHAR]) - [Jan]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([location2_0_1_] : [VARCHAR]) - [Made]
Hibernate:
select
contact0_.contact_id as contact_1_2_1_,
contact0_.address_address_id as address_3_2_1_,
contact0_.name as name2_2_1_,
address1_.address_id as address_1_0_0_,
address1_.location as location2_0_0_
from
contact contact0_
left outer join
address address1_
on contact0_.address_address_id=address1_.address_id
where
contact0_.address_address_id=?
TRACE o.h.t.d.s.BasicBinder [main]: binding parameter [1] as [BIGINT] - [1]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([address_1_0_0_] : [BIGINT]) - [1]
TRACE o.h.t.d.s.BasicExtractor [main]: extracted value ([contact_1_2_1_] : [BIGINT]) - [1]
Note: My EntityManagerFactoryCreator is a singleton that calls Persistence.createEntityManagerFactory("nl.infosupport.javaminor.week4.jpa.h2");
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="nl.infosupport.javaminor.week4.jpa.h2">
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<properties>
<property name="javax.persistence.jdbc.user" value="sa"/>
<property name="javax.persistence.jdbc.password" value="sa"/>
<property name="javax.persistence.jdbc.url" value="jdbc:h2:~/Documents/InfoSupport-Minor/h2_embedded_db/test"/>
<property name="javax.persistence.jdbc.driver" value="org.h2.Driver"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
<property name="hibernate.show_sql" value="true"/>
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
</properties>
</persistence-unit>
</persistence>
This is normal behavior in this case and with the tables config you have. If you want to have just one select, you need to use a custom query joining the child table. For example, using HQL it would look like that:
public Contact find(Long id) {
TypedQuery<Contact> query = em.createQuery(
"SELECT c FROM Contact c join fetch c.address WHERE c.id = :id", Contact.class);
return query
.setParameter("id", id)
.getSingleResult();
}
The code is not necessary working, I didn't debug it, but it shows the principle.
UPDATED
Or you can try annotating the field like
@Fetch(FetchMode.JOIN)
private Address address;
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