Generic Dao: Create
/////////////////////////////////////////////////////////////////////////
<?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 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; }
}
/////////////////////////////////////////////////////////////////////////
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);
}
}
/////////////////////////////////////////////////////////////////////////
<?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>
/////////////////////////////////////////////////////////////////////////
import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import org.apache.commons.logging.*;
public class HibernateFactory {
private static SessionFactory sessionFactory;
private static Log log = LogFactory.getLog(HibernateFactory.class);
/**
* Constructs a new Singleton SessionFactory
* @return
* @throws HibernateException
*/
public static SessionFactory buildSessionFactory() throws HibernateException {
if (sessionFactory != null) {
closeFactory();
}
return configureSessionFactory();
}
/**
* Builds a SessionFactory, if it hasn't been already.
*/
public static SessionFactory buildIfNeeded() throws DataAccessLayerException{
if (sessionFactory != null) {
return sessionFactory;
}
try {
return configureSessionFactory();
} catch (HibernateException e) {
throw new DataAccessLayerException(e);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public static Session openSession() throws HibernateException {
buildIfNeeded();
return sessionFactory.openSession();
}
public static void closeFactory() {
if (sessionFactory != null) {
try {
sessionFactory.close();
} catch (HibernateException ignored) {
log.error("Couldn't close SessionFactory", ignored);
}
}
}
public static void close(Session session) {
if (session != null) {
try {
session.close();
} catch (HibernateException ignored) {
log.error("Couldn't close Session", ignored);
}
}
}
public static void rollback(Transaction tx) {
try {
if (tx != null) {
tx.rollback();
}
} catch (HibernateException ignored) {
log.error("Couldn't rollback Transaction", ignored);
}
}
/**
*
* @return
* @throws HibernateException
*/
private static SessionFactory configureSessionFactory() throws HibernateException {
Configuration configuration = new Configuration();
configuration.configure();
sessionFactory = configuration.buildSessionFactory();
return sessionFactory;
}
}
/////////////////////////////////////////////////////////////////////////
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("Create");
eventDao.create(event);
HibernateUtil.checkData("select uid, name from events");
// hibernate code end
}
}
/////////////////////////////////////////////////////////////////////////
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();
}
protected void saveOrUpdate(Object obj) {
try {
startOperation();
session.saveOrUpdate(obj);
tx.commit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
protected void delete(Object obj) {
try {
startOperation();
session.delete(obj);
tx.commit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
protected Object find(Class clazz, Long id) {
Object obj = null;
try {
startOperation();
obj = session.load(clazz, id);
tx.commit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return obj;
}
protected List findAll(Class clazz) {
List objects = null;
try {
startOperation();
Query query = session.createQuery("from " + clazz.getName());
objects = query.list();
tx.commit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
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();
}
}
/////////////////////////////////////////////////////////////////////////
/**
* Represents Exceptions thrown by the Data Access Layer.
*/
public class DataAccessLayerException extends RuntimeException {
public DataAccessLayerException() {
}
public DataAccessLayerException(String message) {
super(message);
}
public DataAccessLayerException(Throwable cause) {
super(cause);
}
public DataAccessLayerException(String message, Throwable cause) {
super(message, cause);
}
}
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