Data Access - Spring Enterprise Recipes: A Problem Solution Approach - page 148

package com.apress.springenterpriserecipes.course.hibernate;
...
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import org.springframework.transaction.annotation.Transactional;
public class HibernateCourseDao extends HibernateDaoSupport implements
CourseDao {
@Transactional
public void store(Course course) {
getHibernateTemplate().saveOrUpdate(course);
}
@Transactional
public void delete(Long courseId) {
Course course = (Course) getHibernateTemplate().get(Course.class,
courseId);
getHibernateTemplate().delete(course);
}
@Transactional(readOnly = true)
public Course findById(Long courseId) {
return (Course) getHibernateTemplate().get(Course.class, courseId);
}
@Transactional(readOnly = true)
public List<Course> findAll() {
return getHibernateTemplate().find("from Course");
}
}
Because HibernateCourseDao inherits the setSessionFactory() and setHibernateTemplate()
methods, you can inject either of them into your DAO so that you can retrieve the HibernateTemplate
instance. If you inject a session factory, you will be able to delete the HibernateTemplate declaration.
<bean name="courseDao"
class="com.apress.springenterpriserecipes.course.hibernate.HibernateCourseDao">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
Similarly, your JPA DAO can extend JpaDaoSupport to have setEntityManagerFactory() and
setJpaTemplate() inherited. In your DAO methods, you can simply call the getJpaTemplate() method
to retrieve the template instance. This instance will contain the pre-initialized EntityManagerFactory .
package com.apress.springenterpriserecipes.course.jpa;
...
import org.springframework.orm.jpa.support.JpaDaoSupport;
import org.springframework.transaction.annotation.Transactional;