Generic Dao: Update
///////////////////////////////////////////////////////////////////////// import java.util.*; import java.sql.*; import org.hibernate.*; import org.hibernate.criterion.*; public class Main { public static void main(String[] args) { HibernateUtil.setup("create table EVENTS ( uid int, name VARCHAR, start_Date date, duration int);"); // hibernate code start EventDao eventDao = new EventDao(); Event event = new Event(); event.setName("Update an Event"); eventDao.create(event); HibernateUtil.checkData("select uid, name from events"); Event foundEvent = eventDao.find(event.getId()); foundEvent.setName("New Name"); eventDao.update(foundEvent); HibernateUtil.checkData("select uid, name from events"); // hibernate code end } } ///////////////////////////////////////////////////////////////////////// import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.Transaction; import java.util.List; public class EventDao extends AbstractDao { public EventDao() { super(); } /** * Insert a new Event into the database. * @param event */ public void create(Event event) throws DataAccessLayerException { super.saveOrUpdate(event); } /** * Delete a detached Event from the database. * @param event */ public void delete(Event event) throws DataAccessLayerException { super.delete(event); } /** * Find an Event by its primary key. * @param id * @return */ public Event find(Long id) throws DataAccessLayerException { return (Event) super.find(Event.class, id); } /** * Updates the state of a detached Event. * * @param event */ public void update(Event event) throws DataAccessLayerException { super.saveOrUpdate(event); } /** * Finds all Events in the database. * @return */ public List findAll() throws DataAccessLayerException{ return super.findAll(Event.class); } } ///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.Date; import java.util.Set; import java.util.LinkedHashSet; public class Event implements Serializable { private Long id; private int duration; private String name; private Date startDate; public Event() { } public Event(String name) { this.name = name; } /** * @hibernate.id generator-class="native" column="uid" * @return */ public Long getId() { return id; } public void setId(Long id) { this.id = id; } /** * @hibernate.property column="name" * @return */ public String getName() { return name; } public void setName(String name) { this.name = name; } /** * @hibernate.property column="start_date" * @return */ public Date getStartDate() { return startDate; } public void setStartDate(Date startDate) { this.startDate = startDate; } /** * @hibernate.property column="duration" * @return */ public int getDuration() { return duration; } public void setDuration(int duration) { this.duration = duration; } } ///////////////////////////////////////////////////////////////////////// <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping > <class name="Event" table="events"> <id name="id" column="uid" type="long"> <generator class="increment"/> </id> <property name="name" type="string"/> <property name="startDate" column="start_date" type="date"/> <property name="duration" type="integer"/> </class> </hibernate-mapping> ///////////////////////////////////////////////////////////////////////// import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.Transaction; import org.hibernate.Query; import java.util.List; public abstract class AbstractDao { private Session session; private Transaction tx; public AbstractDao() { HibernateFactory.buildIfNeeded(); startOperation(); } protected void saveOrUpdate(Object obj) { try { session.saveOrUpdate(obj); tx.commit(); } catch (HibernateException e) { handleException(e); } } protected void delete(Object obj) { try { session.delete(obj); tx.commit(); } catch (HibernateException e) { handleException(e); } } protected Object find(Class clazz, Long id) { Object obj = null; try { obj = session.load(clazz, id); tx.commit(); } catch (HibernateException e) { handleException(e); } return obj; } protected List findAll(Class clazz) { List objects = null; try { Query query = session.createQuery("from " + clazz.getName()); objects = query.list(); tx.commit(); } catch (HibernateException e) { handleException(e); } return objects; } protected void handleException(HibernateException e) throws DataAccessLayerException { HibernateFactory.rollback(tx); throw new DataAccessLayerException(e); } protected void startOperation() throws HibernateException { session = HibernateFactory.openSession(); tx = session.beginTransaction(); } } ///////////////////////////////////////////////////////////////////////// <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <mapping resource="Event.hbm.xml"/> </session-factory> </hibernate-configuration>
1. | Generic Dao: Create | ![]() | |
2. | Generic: Dao Delete | ![]() | |
3. | Generic Dao: Find | ![]() | |
4. | Generic Dao Find All | ![]() | |
5. | Generic Dao Save Or Update | ![]() |