HSQL Join Two Classes : HSQL « Hibernate « Java Tutorial

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Java Tutorial » Hibernate » HSQL 
21. 11. 10. HSQL Join Two Classes

File: Main.java

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

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();
    
    
    
    String hql = "select s.name, p.name, p.price from Product p inner join p.supplier as s";
    Query query = session.createQuery(hql);
    List results = query.list();

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

File: Product.hbm.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
   <class name="Product">
      <id name="id" type="int">
         <generator class="increment"/>
      </id>

      <property name="name" type="string"/>
      <property name="description" type="string"/>
      <property name="price" type="double"/>
      <many-to-one name="supplier" class="Supplier" column="supplierId"/>

   </class>
   
   <query name="Product.HQLpricing">
     select product.price from Product product 
  </query>   
   <sql-query name="Product.SQLpricing">
   <return-scalar column="price" type="double"/>
     select product.price from Product as product 
  </sql-query>     
</hibernate-mapping>

File: Product.java

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;
    }
}

File: Software.hbm.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
   <joined-subclass name="Software" extends="Product">
      <key column="Id"/>
      <property name="version" type="string"/>
   </joined-subclass>
</hibernate-mapping>

File: Software.java

public class Software extends Product
{
    private String version;
    
    public Software()
    {
        super();
    }
    
    public Software(String name, String description, double price, String version)
    {
        super(name, description, price);
        this.setVersion(version);
    }

    public String getVersion()
    {
        return version;
    }
    public void setVersion(String version)
    {
        this.version = version;
    }
}

File: Supplier.hbm.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
   PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
   <class name="Supplier" >
      <id name="id" type="int">
         <generator class="increment"/>
      </id>

      <property name="name" type="string"/>
      <bag name="products" inverse="true" cascade="all,delete-orphan">
        <key column="supplierId"/>
        <one-to-many class="Product"/>
      </bag>


   </class>
</hibernate-mapping>

File: Supplier.java

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;
    }
}

File: HibernateUtil.java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
  Session session;
  Statement st;
  public HibernateUtil() throws Exception{
    SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
    session = sessionFactory.openSession();

    // Load the JDBC driver.
    Class.forName("org.hsqldb.jdbcDriver");
    System.out.println("Driver Loaded.");
    // Establish the connection to the database.
    String url = "jdbc:hsqldb:data/tutorial";

    Connection conn = DriverManager.getConnection(url, "sa", "");
    System.out.println("Got Connection.");
    st = conn.createStatement();
  }
  public Session getSession(){
    return session;
  }
  public void executeSQLCommand(String sql) throws Exception {
    st.executeUpdate(sql);
  }

  public void checkData(String sql) throws Exception {
    ResultSet rs = st.executeQuery(sql);
    ResultSetMetaData metadata = rs.getMetaData();

    for (int i = 0; i < metadata.getColumnCount(); i++) {
      System.out.print("\t"+ metadata.getColumnLabel(i + 1)); 
    }
    System.out.println("\n----------------------------------");

    while (rs.next()) {
      for (int i = 0; i < metadata.getColumnCount(); i++) {
        Object value = rs.getObject(i + 1);
        if (value == null) {
          System.out.print("\t       ");
        } else {
          System.out.print("\t"+value.toString().trim());
        }
      }
      System.out.println("");
    }
  }
}

File: hibernate.cfg.xml

<?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>
        <!-- Enable Hibernate's current session context -->
        <property name="current_session_context_class">org.hibernate.context.ManagedSessionContext</property>

        <property name="hibernate.cache.use_second_level_cache">false</property>
        <property name="hibernate.cache.use_query_cache">false</property>
        
        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>        
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
        
        <!-- Mapping files -->
        <mapping resource="Product.hbm.xml"/>
        <mapping resource="Software.hbm.xml"/>
        <mapping resource="Supplier.hbm.xml"/>
    </session-factory>
</hibernate-configuration>
  Download:  HibernateHSQLJoinTwoClasses.zip( 4,865 k)
21. 11. HSQL
21. 11. 1. Query a Class Name (a table)
21. 11. 2. Query on a field in a class
21. 11. 3. HSQL Where Clause And Condition
21. 11. 4. HSQL Table Alias
21. 11. 5. HSQL Reference Object Type Field
21. 11. 6. HSQL Order By Ascending Order
21. 11. 7. HSQL Order By clause
21. 11. 8. HSQL Named Query
21. 11. 9. HSQL: Set Max Result
21. 11. 10. HSQL Join Two Classes
21. 11. 11. HSQL Inner Join Class And Its Field
21. 11. 12. HSQL pageable result: First, Max Result
21. 11. 13. HSQL Fetch Associations
21. 11. 14. HSQL Count function
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