Data Access - Spring Enterprise Recipes: A Problem Solution Approach - page 144

Table 3-4. Spring's Support Classes for Different Data Access Strategies

Support Class JDBC Hibernate JPA

Template class

JdbcTemplate HibernateTemplate JpaTemplate

JdbcDaoSupport HibernateDaoSupport JpaDaoSupport DAO support

DataSourceTransaction HibernateTransaction JpaTransactionManager Transaction

Spring defines the HibernateTemplate and JpaTemplate classes to provide template methods for
different types of Hibernate and JPA operations to minimize the effort involved in using them. The
template methods in HibernateTemplate and JpaTemplate ensure that Hibernate sessions and JPA entity
managers will be opened and closed properly. They will also have native Hibernate and JPA transactions
participate in Spring-managed transactions. As a result, you will be able to manage transactions
declaratively for your Hibernate and JPA DAOs without any boilerplate transaction code.

How It Works

Using a Hibernate Template and a JPA Template
First, the HibernateCourseDao class can be simplified as follows with the help of Spring's
HibernateTemplate :

package com.apress.springenterpriserecipes.course.hibernate;
...
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.transaction.annotation.Transactional;

public class HibernateCourseDao implements CourseDao {

private HibernateTemplate hibernateTemplate;

public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
this.hibernateTemplate = hibernateTemplate;
}

@Transactional
public void store(Course course) {
hibernateTemplate.saveOrUpdate(course);
}

@Transactional
public void delete(Long courseId) {
Course course = (Course) hibernateTemplate.get(Course.class, courseId);
hibernateTemplate.delete(course);
}