How to use HibernateTemplate? - spring

Question

I am performing retrieval operation to get list of students from database. But I am getting 'empty' data from database. Used HibernateTemplate in
Spring with Hibernate integration,
domain class:-
#Entity
#Table(name="student")
public class StdBO {
#Id
private int sno;
private String sname,sadd;
//setters and getters
}
How can I use HibernateCallBack() interface for search operation? This is my first time that integrating spring with hibernate, is the below way correct? I tried many ways to perform search operations using HibernateTemplate but failing to get the details
DAO
#Repository
public class StdDAO {
private HibernateTemplate ht;
public void setHt(HibernateTemplate ht) {
this.ht = ht;
}
public List<StdBO> select(){
List<StdBO> list = ht.executeFind(new HibernateCallback() {
public Object doInHibernate(Session ses)
throws HibernateException, SQLException {
Criteria criteria=ses.createCriteria(StdBO.class);
System.out.println("before printing sutdents");
List<StdBO> bos = criteria.list();
System.out.println("students are"+bos);//here getting empty list
return bos;
}
});
return list;
}
xml
<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="myDataSource" />
<property name="annotatedClasses">
<list>
<value>com.nt.dao.StdDAO</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.HSQLDialect</prop>
<prop key="hibernate.current_session_context_class">thread</prop>
</props>
</property>
</bean>
<bean id="template" class="org.springframework.orm.hibernate3.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="dao" class="com.nt.dao.StdDAO">
<property name="ht" ref="template" />
</bean>

Answer 1

You need begin (and commit) a transaction to query data. You can do it manually by session.beginTransaction() or using #Transactional annotation. For using #Transactional annotation you will need to do some additional spring configuration:
Hibernate Transaction Annotation Configuration.