Java/Hibernate/Hibernate Session — различия между версиями
Admin (обсуждение | вклад) м (1 версия) |
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Текущая версия на 09:51, 1 июня 2010
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>