Java/Hibernate/DAO Simple DAO
Содержание
Simple Dao Create
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.*; 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
SimpleEventDao eventDao = new SimpleEventDao();
Event event = new Event();
event.setName("Create an Event");
eventDao.create(event);
Event event2 = null;
Session session = HibernateUtil.currentSession();
Transaction tx = session.beginTransaction();
event2 = (Event) session.load(Event.class, event.getId());
System.out.println(event.getName());
System.out.println(event2.getName());
tx.rumit();
HibernateUtil.closeSession();
HibernateUtil.sessionFactory.close();
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 org.apache.rumons.logging.Log; import org.apache.rumons.logging.LogFactory; import java.util.List; public class SimpleEventDao {
Log log = LogFactory.getLog(SimpleEventDao.class);
private Session session;
private Transaction tx;
public SimpleEventDao() {
HibernateFactory.buildIfNeeded();
}
/**
* Insert a new Event into the database.
* @param event
*/
public void create(Event event) throws DataAccessLayerException {
try {
startOperation();
session.save(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Delete a detached Event from the database.
* @param event
*/
public void delete(Event event) throws DataAccessLayerException {
try {
startOperation();
session.delete(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Find an Event by its primary key.
* @param id
* @return
*/
public Event find(Long id) throws DataAccessLayerException {
Event event = null;
try {
startOperation();
event = (Event) session.load(Event.class, id);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return event;
}
/**
* Updates the state of a detached Event.
*
* @param event
*/
public void update(Event event) throws DataAccessLayerException {
try {
startOperation();
session.update(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Finds all Events in the database.
* @return
*/
public List findAll() throws DataAccessLayerException{
List events = null;
try {
startOperation();
Query query = session.createQuery("from Event");
events = query.list();
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return events;
}
private void handleException(HibernateException e) throws DataAccessLayerException {
HibernateFactory.rollback(tx);
throw new DataAccessLayerException(e);
}
private 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);
}
}
///////////////////////////////////////////////////////////////////////// <?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; }
}
/////////////////////////////////////////////////////////////////////////
</source>
Simple Dao Delete
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.*; 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
SimpleEventDao eventDao = new SimpleEventDao();
Event event = new Event();
event.setName("Create an Event");
try {
eventDao.create(event);
eventDao.delete(event);
} catch (ObjectNotFoundException expected) {
// expected
}
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 org.apache.rumons.logging.Log; import org.apache.rumons.logging.LogFactory; import java.util.List; public class SimpleEventDao {
Log log = LogFactory.getLog(SimpleEventDao.class);
private Session session;
private Transaction tx;
public SimpleEventDao() {
HibernateFactory.buildIfNeeded();
}
/**
* Insert a new Event into the database.
* @param event
*/
public void create(Event event) throws DataAccessLayerException {
try {
startOperation();
session.save(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Delete a detached Event from the database.
* @param event
*/
public void delete(Event event) throws DataAccessLayerException {
try {
startOperation();
session.delete(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Find an Event by its primary key.
* @param id
* @return
*/
public Event find(Long id) throws DataAccessLayerException {
Event event = null;
try {
startOperation();
event = (Event) session.load(Event.class, id);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return event;
}
/**
* Updates the state of a detached Event.
*
* @param event
*/
public void update(Event event) throws DataAccessLayerException {
try {
startOperation();
session.update(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Finds all Events in the database.
* @return
*/
public List findAll() throws DataAccessLayerException{
List events = null;
try {
startOperation();
Query query = session.createQuery("from Event");
events = query.list();
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return events;
}
private void handleException(HibernateException e) throws DataAccessLayerException {
HibernateFactory.rollback(tx);
throw new DataAccessLayerException(e);
}
private 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);
}
}
///////////////////////////////////////////////////////////////////////// <?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; }
}
</source>
Simple Dao Find All
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.*; 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
SimpleEventDao eventDao = new SimpleEventDao();
Event event1 = new Event();
Event event2 = new Event();
event1.setName("Events 1");
event2.setName("Events 2");
eventDao.create(event1);
eventDao.create(event2);
List eventList = eventDao.findAll();
System.out.println();
System.out.println();
System.out.println();
System.out.println();
System.out.println(eventList.size());
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 org.apache.rumons.logging.Log; import org.apache.rumons.logging.LogFactory; import java.util.List; public class SimpleEventDao {
Log log = LogFactory.getLog(SimpleEventDao.class);
private Session session;
private Transaction tx;
public SimpleEventDao() {
HibernateFactory.buildIfNeeded();
}
/**
* Insert a new Event into the database.
* @param event
*/
public void create(Event event) throws DataAccessLayerException {
try {
startOperation();
session.save(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Delete a detached Event from the database.
* @param event
*/
public void delete(Event event) throws DataAccessLayerException {
try {
startOperation();
session.delete(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Find an Event by its primary key.
* @param id
* @return
*/
public Event find(Long id) throws DataAccessLayerException {
Event event = null;
try {
startOperation();
event = (Event) session.load(Event.class, id);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return event;
}
/**
* Updates the state of a detached Event.
*
* @param event
*/
public void update(Event event) throws DataAccessLayerException {
try {
startOperation();
session.update(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Finds all Events in the database.
* @return
*/
public List findAll() throws DataAccessLayerException{
List events = null;
try {
startOperation();
Query query = session.createQuery("from Event");
events = query.list();
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return events;
}
private void handleException(HibernateException e) throws DataAccessLayerException {
HibernateFactory.rollback(tx);
throw new DataAccessLayerException(e);
}
private 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);
}
}
///////////////////////////////////////////////////////////////////////// <?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; }
}
</source>
Simple Dao Load
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.util.*; 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
SimpleEventDao eventDao = new SimpleEventDao();
Event event = new Event();
event.setName("Create an Event");
eventDao.create(event);
Event foundEvent = eventDao.find(/*event.getId()*/1L);
System.out.println(foundEvent.getName());
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 org.apache.rumons.logging.Log; import org.apache.rumons.logging.LogFactory; import java.util.List; public class SimpleEventDao {
Log log = LogFactory.getLog(SimpleEventDao.class);
private Session session;
private Transaction tx;
public SimpleEventDao() {
HibernateFactory.buildIfNeeded();
}
/**
* Insert a new Event into the database.
* @param event
*/
public void create(Event event) throws DataAccessLayerException {
try {
startOperation();
session.save(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Delete a detached Event from the database.
* @param event
*/
public void delete(Event event) throws DataAccessLayerException {
try {
startOperation();
session.delete(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Find an Event by its primary key.
* @param id
* @return
*/
public Event find(Long id) throws DataAccessLayerException {
Event event = null;
try {
startOperation();
event = (Event) session.load(Event.class, id);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return event;
}
/**
* Updates the state of a detached Event.
*
* @param event
*/
public void update(Event event) throws DataAccessLayerException {
try {
startOperation();
session.update(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Finds all Events in the database.
* @return
*/
public List findAll() throws DataAccessLayerException{
List events = null;
try {
startOperation();
Query query = session.createQuery("from Event");
events = query.list();
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return events;
}
private void handleException(HibernateException e) throws DataAccessLayerException {
HibernateFactory.rollback(tx);
throw new DataAccessLayerException(e);
}
private 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);
}
}
///////////////////////////////////////////////////////////////////////// <?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; }
}
</source>
Simple Dao Update
<source lang="java">
/////////////////////////////////////////////////////////////////////////
import java.util.*; 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
SimpleEventDao eventDao = new SimpleEventDao();
Event event1 = new Event();
event1.setName("Events 1");
eventDao.create(event1);
event1.setName("new Name");
eventDao.update(event1);
System.out.println();
System.out.println();
System.out.println();
System.out.println();
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 org.apache.rumons.logging.Log; import org.apache.rumons.logging.LogFactory; import java.util.List; public class SimpleEventDao {
Log log = LogFactory.getLog(SimpleEventDao.class);
private Session session;
private Transaction tx;
public SimpleEventDao() {
HibernateFactory.buildIfNeeded();
}
/**
* Insert a new Event into the database.
* @param event
*/
public void create(Event event) throws DataAccessLayerException {
try {
startOperation();
session.save(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Delete a detached Event from the database.
* @param event
*/
public void delete(Event event) throws DataAccessLayerException {
try {
startOperation();
session.delete(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Find an Event by its primary key.
* @param id
* @return
*/
public Event find(Long id) throws DataAccessLayerException {
Event event = null;
try {
startOperation();
event = (Event) session.load(Event.class, id);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return event;
}
/**
* Updates the state of a detached Event.
*
* @param event
*/
public void update(Event event) throws DataAccessLayerException {
try {
startOperation();
session.update(event);
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
}
/**
* Finds all Events in the database.
* @return
*/
public List findAll() throws DataAccessLayerException{
List events = null;
try {
startOperation();
Query query = session.createQuery("from Event");
events = query.list();
tx.rumit();
} catch (HibernateException e) {
handleException(e);
} finally {
HibernateFactory.close(session);
}
return events;
}
private void handleException(HibernateException e) throws DataAccessLayerException {
HibernateFactory.rollback(tx);
throw new DataAccessLayerException(e);
}
private 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);
}
}
///////////////////////////////////////////////////////////////////////// <?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; }
}
</source>
