Class In Hierarchy Has Its Own Table : Mapping Inheritance « Hibernate « Java Tutorial

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Java Tutorial » Hibernate » Mapping Inheritance 
21. 8. 3. Class In Hierarchy Has Its Own Table

File: Main.java

import java.util.Iterator;
import java.util.List;

import org.hibernate.Session;

public class Main {
  public static void main(String[] argsthrows Exception {
    HibernateUtil hibernateUtil = new HibernateUtil();
    hibernateUtil
        .executeSQLCommand("create table CD(id varchar,title varchar,artist varchar,purchaseDate date,cost decimal(6,2))");

    hibernateUtil
    .executeSQLCommand("create table SECD(id varchar,title varchar,artist varchar,purchaseDate date,cost decimal(6,2), newfeatures varchar)");

    hibernateUtil
    .executeSQLCommand("create table ICD(id varchar,title varchar,artist varchar,purchaseDate date,cost decimal(6,2),languages varchar, region int)");

    Session session = hibernateUtil.getSession();
    CD cd = new CD();
    cd.setArtist("artist");
    cd.setTitle("title");
    
    String id = (String)session.save(cd);
    System.out.println(id);
    

    SpecialEditionCD scd = new SpecialEditionCD();
    scd.setNewfeatures("new");
    session.save(scd);
    
    InternationalCD icd = new InternationalCD();
    icd.setLanguages("ENG");
    session.save(icd);
    
    session.flush();
    List cds = session.createQuery("from CD").list();
    Iterator iter = cds.iterator();
    while (iter.hasNext()) {
      CD cd1 = (CDiter.next();
      System.out.println(cd1.getArtist());
    }
    session.close();
    hibernateUtil.checkData("select * from CD");
    hibernateUtil.checkData("select * from SECD");
    hibernateUtil.checkData("select * from ICD");
  }
}

File: CD.java

import java.util.Date;

public class CD {
  String id;

  String title;

  String artist;

  Date purchaseDate;

  double cost;

  public CD() {
  }



  public Date getPurchaseDate() {
    return purchaseDate;
  }



  public void setPurchaseDate(Date purchaseDate) {
    this.purchaseDate = purchaseDate;
  }



  public CD(String title, String artist, Date purchaseDate, double cost) {
    this.title = title;
    this.artist = artist;
    this.purchaseDate = purchaseDate;
    this.cost = cost;
  }

  public void setId(String id) {
    this.id = id;
  }

  public String getId() {
    return id;
  }

  public void setTitle(String title) {
    this.title = title;
  }

  public String getTitle() {
    return title;
  }

  public void setArtist(String artist) {
    this.artist = artist;
  }

  public String getArtist() {
    return artist;
  }


  public void setCost(double cost) {
    this.cost = cost;
  }

  public double getCost() {
    return cost;
  }
}

File: InternationalCD.java

import java.util.*;

public class InternationalCD extends CD 

  private String languages; 
  
  
  public InternationalCD() {
  }

  public InternationalCD(String title, String artist, Date purchaseDate, double cost, String language) {
    super(title, artist, purchaseDate, cost);

    languages = language;

  }

  public void setLanguages(String s) {
    languages = s;
  }

  public String getLanguages() {
    return languages;
  }

}

File: log4j.properties

log4j.rootCategory=WARN, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%-4[%t%-5p %c %x - %m%n
log4j.appender.stdout.Target=System.out

File: SpecialEditionCD.java

import java.util.*;

public class SpecialEditionCD extends CD 

  private String newfeatures;
  
  public SpecialEditionCD() {
  }

    public SpecialEditionCD(String title, String artist, Date purchaseDate, double cost, String features) {
      super(title, artist, purchaseDate, cost);

      newfeatures = features;
    }

  public void setNewfeatures(String s) {
    newfeatures = s;
  }

  public String getNewfeatures() {
    return newfeatures;
  }
}

File: CD.hbm.xml

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE hibernate-mapping 
    PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping> 
  <class name="CD" table="cd">
    <id name="Id" type="string" unsaved-value="null">
      <column name="ID" sql-type="text" not-null="true"/> 
      <generator class="uuid.hex"/>
    </id>

    <property name="title"/>
    <property name="artist"/>
    <property name="purchaseDate" type="date"/> 
    <property name="cost" type="double"/> 
  </class>
    <class name="SpecialEditionCD" table="secd">
        <id name="id" type="string" unsaved-value="0">
          <generator  class="uuid.hex"/>
        </id>
        <property name="title"/>
    <property name="artist"/>
    <property name="purchaseDate" type="date"/> 
    <property name="cost" type="double"/> 
        <property name="newfeatures" type="string"/>
    </class>
    <class name="InternationalCD" table="icd">
        <id name="id" type="string" unsaved-value="0">
           <generator class="uuid.hex"/>
        </id>
      <property name="title"/>
    <property name="artist"/>
    <property name="purchaseDate" type="date"/> 
    <property name="cost" type="double"/> 
        <property name="languages"/>
</class
  
</hibernate-mapping>

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="CD.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

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;
  Configuration config;
  
  public HibernateUtil() throws Exception{
    config = new Configuration().configure();

    
    SessionFactory sessionFactory = config.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 Configuration getConfiguration(){
    return config;
  }
  public Session getSession(){
    return session;
  }
  public void executeSQLCommand(String sqlthrows Exception {
    st.executeUpdate(sql);
  }

  public void checkData(String sqlthrows 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("");
    }
  }
}
  Download:  HibernateClassInHierarchyHasItsOwnTable.zip( 4,864 k)
21. 8. Mapping Inheritance
21. 8. 1. Mapping Class Hierarchy
21. 8. 2. Class In Hierarchy Maps To One Table
21. 8. 3. Class In Hierarchy Has Its Own Table
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