Java Tutorial/Hibernate/Query by Example

QBE Advanced Criteria

File: Main.java

   <source lang="java">

import java.util.List; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.criterion.Example; public class Main {

 public static void main(String[] args) throws Exception {
   HibernateUtil hibernateUtil = new HibernateUtil();
   hibernateUtil
       .executeSQLCommand("create table Product(id int, name varchar, description varchar, price decimal(6,2), supplierid int)");
    
   hibernateUtil
   .executeSQLCommand("create table Supplier (id int , name varchar)");
   hibernateUtil
   .executeSQLCommand("create table Software(id int, name varchar, description varchar, price decimal(6,2), supplierid int, version varchar)");
   
   Session session = hibernateUtil.getSession();
   Supplier superCorp = new Supplier();
   superCorp.setName("Supplier1");
   session.save(superCorp);
   
   Supplier megaInc = new Supplier();
   megaInc.setName("Supplier2");
   session.save(megaInc);        
   Product mouse = new Product("Product1","first product", 20.0);
   mouse.setSupplier(superCorp);
   superCorp.getProducts().add(mouse);
   session.flush();
   Product mouse2 = new Product("Product2","second product", 22.0);
   mouse2.setSupplier(superCorp);
   superCorp.getProducts().add(mouse2);        
   
   Product keyboard = new Product("Product3", "third product", 30.0);
   keyboard.setSupplier(megaInc);
   megaInc.getProducts().add(keyboard);
   Software webBrowser = new Software("Web Browser","new browser", 75.0, "2.0");
   webBrowser.setSupplier(superCorp);
   superCorp.getProducts().add(webBrowser);
   Software email = new Software("Email","email client", 49.99, "4.1 Edition");
   email.setSupplier(megaInc);
   megaInc.getProducts().add(email);    
   session.flush();
   
   
   Criteria prdCrit = session.createCriteria(Product.class);
   Product product = new Product();
   product.setName("P%");
   Example prdExample = Example.create(product);
   prdExample.excludeProperty("price");
   prdExample.enableLike();
   Criteria suppCrit = prdCrit.createCriteria("supplier");
   Supplier supplier = new Supplier();
   supplier.setName("Supplier2");
   suppCrit.add(Example.create(supplier));
   prdCrit.add(prdExample);
   List results = prdCrit.list();

   System.out.println(results);
   
   session.close();
   hibernateUtil.checkData("select * from Product");
   hibernateUtil.checkData("select * from Software");
   hibernateUtil.checkData("select * from Supplier");
 }

}</source>

QBE Criteria: Not Null Or Zero

File: Main.java

   <source lang="java">

import java.util.List; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.criterion.Example; public class Main {

 public static void main(String[] args) throws Exception {
   HibernateUtil hibernateUtil = new HibernateUtil();
   hibernateUtil
       .executeSQLCommand("create table Product(id int, name varchar, description varchar, price decimal(6,2), supplierid int)");
    
   hibernateUtil
   .executeSQLCommand("create table Supplier (id int , name varchar)");
   hibernateUtil
   .executeSQLCommand("create table Software(id int, name varchar, description varchar, price decimal(6,2), supplierid int, version varchar)");
   
   Session session = hibernateUtil.getSession();
   Supplier superCorp = new Supplier();
   superCorp.setName("Supplier1");
   session.save(superCorp);
   
   Supplier megaInc = new Supplier();
   megaInc.setName("Supplier2");
   session.save(megaInc);        
   Product mouse = new Product("Product1","first product", 20.0);
   mouse.setSupplier(superCorp);
   superCorp.getProducts().add(mouse);
   session.flush();
   Product mouse2 = new Product("Product2","second product", 22.0);
   mouse2.setSupplier(superCorp);
   superCorp.getProducts().add(mouse2);        
   
   Product keyboard = new Product("Product3", "third product", 30.0);
   keyboard.setSupplier(megaInc);
   megaInc.getProducts().add(keyboard);
   Software webBrowser = new Software("Web Browser","new browser", 75.0, "2.0");
   webBrowser.setSupplier(superCorp);
   superCorp.getProducts().add(webBrowser);
   Software email = new Software("Email","email client", 49.99, "4.1 Edition");
   email.setSupplier(megaInc);
   megaInc.getProducts().add(email);    
   session.flush();
   
   
   Criteria crit = session.createCriteria(Product.class);
   Product exampleProduct = new Product();
   exampleProduct.setName("Product3");
   Example example = Example.create(exampleProduct);
   example.excludeZeroes();
   crit.add(example);
   List results = crit.list();

   System.out.println(results);
   
   
   
   session.close();
   hibernateUtil.checkData("select * from Product");
   hibernateUtil.checkData("select * from Software");
   hibernateUtil.checkData("select * from Supplier");
 }

}</source>

Query By Example

File: Main.java

   <source lang="java">

import java.util.Date; import java.util.Iterator; import java.util.List; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.criterion.Example; public class Main {

 public static void main(String[] args) throws Exception {
   HibernateUtil hibernateUtil = new HibernateUtil();
   hibernateUtil
       .executeSQLCommand("create table survey (id int,name varchar, purchasedate date);");
   Session session = hibernateUtil.getSession();
   Survey survey = new Survey();
   survey.setName("Survey");
   survey.setPurchaseDate(new Date());
   session.save(survey);
   
   survey = new Survey();
   survey.setName("Survey1");
   survey.setPurchaseDate(new Date());    
   session.save(survey);
   
   session.flush();
   
   Criteria crit = session.createCriteria(Survey.class);
   Survey supplier = new Survey();
   supplier.setName("Survey");
   crit.add(Example.create(supplier));
   List results = crit.list();
   Iterator iter = results.iterator();
   while (iter.hasNext()) {
     Survey cd = (Survey) iter.next();
     System.out.println("Result Name:"+cd.getName());
   }
   session.close();
   hibernateUtil.checkData("select * from survey");
 }

}</source>