Unique Result HQL
/////////////////////////////////////////////////////////////////////////
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 Supplier ( id int, name VARCHAR);");
HibernateUtil.setup("create table Product ( id int, name VARCHAR, description VARCHAR, price double,supplierId int);");
prepareData();
Session session = HibernateUtil.currentSession();
String hql = "from Product where price>2.0";
Query query = session.createQuery(hql);
query.setMaxResults(1);
Product product = (Product) query.uniqueResult();
//test for null here if needed
List results = new ArrayList();
results.add(product);
displayProductsList(results);
HibernateUtil.checkData("select * from Supplier");
HibernateUtil.checkData("select * from Product");
}
static public void displayProductsList(List list){
Iterator iter = list.iterator();
if (!iter.hasNext()){
System.out.println("No products to display.");
return;
}
while (iter.hasNext()) {
Product product = (Product) iter.next();
String msg = product.getSupplier().getName() + "\t";
msg += product.getName() + "\t";
msg += product.getPrice() + "\t";
msg += product.getDescription();
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;
}
}
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