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2010-06-01T06:51:18Z

1 версия

в 18:01, 31 мая 2010

2010-05-31T18:01:45Z

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== Session Disconnect And Reconnect ==



<source lang="java">
/////////////////////////////////////////////////////////////////////////
import java.util.*;
import java.sql.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.criterion.*;
public class Main {

public static void main(String[] args) {
HibernateUtil.setup("create table Supplier ( id int, name VARCHAR);");
HibernateUtil.setup("create table Product ( id int, name VARCHAR, description VARCHAR, price double,supplierId int);");

prepareData();
SessionFactory factory = new Configuration().configure().buildSessionFactory();
Session session = factory.openSession();
Query query = session.createQuery("from Product order by name");
List list = query.list();
Iterator i = list.iterator();
while(i.hasNext()) {
Product p = (Product)i.next();
System.out.println(p.getName());
}
System.out.println("Step 1.");
//session.close();

session.disconnect();
session.reconnect();
query = session.createQuery("from Product order by name");
list = query.list();
i = list.iterator();
while(i.hasNext()) {
Product p = (Product)i.next();
System.out.println(p.getName());
}
System.out.println("Step 2.");

HibernateUtil.checkData("select * from Supplier");
HibernateUtil.checkData("select * from Product");
}
static public void displaySupplierList(List list) {
Iterator iter = list.iterator();
if (!iter.hasNext()) {
System.out.println("No suppliers to display.");
return;
}
while (iter.hasNext()) {
Supplier supplier = (Supplier) iter.next();
String msg = supplier.getName();
System.out.println(msg);
}
}

private static void prepareData(){
Session session = HibernateUtil.currentSession();
Supplier supplier1 = new Supplier();
supplier1.setName("Supplier Name 1");
session.save(supplier1);

Supplier supplier2 = new Supplier();
supplier2.setName("Supplier Name 2");
session.save(supplier2);

Product product1 = new Product("Product 1","Name for Product 1", 2.0);
product1.setSupplier(supplier1);
supplier1.getProducts().add(product1);
session.save(product1);

Product product12 = new Product("Product 2","Name for Product 2", 22.0);
product12.setSupplier(supplier1);
supplier1.getProducts().add(product12);
session.save(product12);

Product product2 = new Product("Product 3", "Name for Product 3", 30.0);
product2.setSupplier(supplier2);
supplier2.getProducts().add(product2);
session.save(product2);

session.flush();
HibernateUtil.closeSession();
}
}

/////////////////////////////////////////////////////////////////////////
public class Product
{
private int id;
private Supplier supplier;

private String name;
private String description;
private double price;

public Product()
{
super();
}

public Product(String name, String description, double price)
{
super();
this.name = name;
this.description = description;
this.price = price;
}

public String getDescription()
{
return description;
}
public void setDescription(String description)
{
this.description = description;
}
public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}

public Supplier getSupplier()
{
return supplier;
}
public void setSupplier(Supplier supplier)
{
this.supplier = supplier;
}

public double getPrice()
{
return price;
}
public void setPrice(double price)
{
this.price = price;
}
}

/////////////////////////////////////////////////////////////////////////
import java.util.ArrayList;
import java.util.List;
public class Supplier
{
private int id;
private String name;
private List products = new ArrayList();

public int getId()
{
return id;
}
public void setId(int id)
{
this.id = id;
}
public String getName()
{
return name;
}
public void setName(String name)
{
this.name = name;
}
public List getProducts()
{
return products;
}
public void setProducts(List products)
{
this.products = products;
}
}

</source>



== Use Two Sessions ==



<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
HibernateFactory.buildSessionFactory();
Session session = HibernateFactory.openSession();
Session session2 = HibernateFactory.openSession();
Event event = new Event();
event.setName("Name");
session.save(event);
session.flush();
Event event2 = (Event) session2.load(Event.class, event.getId());
System.out.println(event2.getName());

HibernateUtil.checkData("select uid, name from events");
// hibernate code end
}

}

/////////////////////////////////////////////////////////////////////////
<?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; }
}

/////////////////////////////////////////////////////////////////////////
/**
* 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);
}
}
</source>

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Java/Hibernate/Hibernate Session - История изменений

Admin: 1 версия

в 18:01, 31 мая 2010