I have 2 tables namely subscriber and contact. Tables look something like this:
subscriber -> id, contact_id //contact_id is a foreign key
contact -> id, firstName, lastName, email, contactType
My Contact.hbm.xml file looks like this:
<hibernate-mapping>
<class name="com.DBNAME.model.Contact" table="contact" >
<id name="id" type="int">
<column name="id" />
<generator class="identity" />
</id>
<property name="contactType" type="int">
<column name="contactType" sql-type="TINYINT"></column>
</property>
<property name="firstName" type="string">
<column name="firstName"></column>
</property>
<property name="lastName" type="string">
<column name="lastName"></column>
</property>
</class>
</hibernate-mapping>
And my Subscriber.hbm.xml file looks like this :
<hibernate-mapping>
<class name="com.DBNAME.model.Subscriber" table="subscriber" >
<id name="id" type="int">
<column name="id" />
<generator class="identity" />
</id>
<many-to-one name="contact" class="com.DBNAME.model.Contact" column="contact_id" unique="true" fetch="join"/>
</class>
</hibernate-mapping>
Now I want to retrieve a simple Subscriber object in which contact gets mapped automatically. So what I do in Java code is :
/**
* get Subscribers
*/
@SuppressWarnings("unchecked")
private void getSubscribersWithContactDetails() {
Session session = HibernateUtils.getSessionFactory().getCurrentSession();
session.beginTransaction();
try {
setSubscribers((List<Subscriber>)session.createQuery("from Subscriber").list());
} catch (HibernateException e) {
session.getTransaction().rollback();
} finally {
session.getTransaction().commit();
}
}
/**
* @param subscribers the subscribers to set
*/
public void setSubscribers(List<Subscriber> subscribers) {
this.subscribers = subscribers;
}
My data classes looks like the following :
public class Contact implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private int contactType;
private String firstName;
private String lastName;
// Getters Setters and constructors
}
public class Subscriber implements Serializable {
private static final long serialVersionUID = 1L;
private int id;
private Contact contact; //Foreign Key from Contact -> id
private int contactId;
//Constructors, Getters and Setters
}
And my query generated by Hibernate looks like this :
select subscriber0_.id as id1_, subscriber0_.contact_id as contact2_1_ from subscriber subscriber0_
I am not getting contact details from contacts table. How will I be able to do that?
Try to use this:
<many-to-one name="contact"
class="com.DBNAME.model.Contact" column="contact_id"
unique="true" lazy="false"/>
Ie lazy="false"
and no fetch
attribute.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.