Hibernate 4

HQL Delete Example

///////////////////////////////////////////////////////////////////////// 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 = "delete from Product where name = :name"; Query query = session.createQuery(hql); query.setString("name","Product 1"); int rowCount = query.executeUpdate(); System.out.println("Rows affected: " + rowCount); //See the results of the update query = session.createQuery("from Product"); List results = query.list(); 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; } } ///////////////////////////////////////////////////////////////////////// <?xml version='1.0' encoding='utf-8'?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">org.hsqldb.jdbcDriver</property> <property name="connection.url">jdbc:hsqldb:data/tutorial</property> <property name="connection.username">sa</property> <property name="connection.password"></property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Mapping files --> <mapping resource="Product.hbm.xml"/> <mapping resource="Supplier.hbm.xml"/> </session-factory> </hibernate-configuration>