My-java-spark

       Hibernate的動(dòng)態(tài)模型為我們動(dòng)態(tài)改動(dòng)表結(jié)構(gòu)帶來了方便, 個(gè)人認(rèn)為這一點(diǎn)非常有價(jià)值, 現(xiàn)在的企業(yè)級(jí)應(yīng)用系統(tǒng)越來越強(qiáng)調(diào)用戶可定制性, hibernate的這一點(diǎn)使用戶自定義字段或自定義表成為可能 .
關(guān)于動(dòng)態(tài)模型, 我還是把hibernate自帶的測試用例貼到這里, 用以備忘.

java代碼:

//$Id: DynamicClassTest.java,v 1.4 2005/03/06 16:31:24 oneovthafew Exp $
package org.hibernate.test.dynamic;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import junit.framework.Test;
import junit.framework.TestSuite;

import org.hibernate.EntityMode;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import org.hibernate.test.TestCase;

/**
 * @author Gavin King
 */
public class DynamicClassTest extends TestCase {
 
 public DynamicClassTest(String str) {
  super(str);
 }

 protected void configure(Configuration cfg) {
  cfg.setProperty(Environment.DEFAULT_ENTITY_MODE, EntityMode.MAP.toString());
 }

 public void testLazyDynamicClass() {
  Session s = openSession();
  assertTrue( "Incorrectly handled default_entity_mode", s.getEntityMode() == EntityMode.MAP );
  Session other = s.getSession( EntityMode.MAP );
  assertEquals( "openSession() using same entity-mode returned new session", s, other );

  other = s.getSession( EntityMode.POJO );
  other.close();
  assertTrue( !other.isOpen() );
  assertTrue( other.isConnected() );  // because it is linked to the "root" session's connection

  s.close();

  s = openSession();
  Transaction t = s.beginTransaction();

  Map cars = new HashMap();
  cars.put("description", "Cars");
  Map monaro = new HashMap();
  monaro.put("productLine", cars);
  monaro.put("name", "monaro");
  monaro.put("description", "Holden Monaro");
  Map hsv = new HashMap();
  hsv.put("productLine", cars);
  hsv.put("name", "hsv");
  hsv.put("description", "Holden Commodore HSV");
  List models = new ArrayList();
  cars.put("models", models);
  models.add(hsv);
  models.add(monaro);
  s.save("ProductLine", cars);
  t.commit();
  s.close();

  s = openSession();
  t = s.beginTransaction();
  
  cars = (Map) s.createQuery("from ProductLine pl order by pl.description").uniqueResult();
  models = (List) cars.get("models");
  assertFalse( Hibernate.isInitialized(models) );
  assertEquals( models.size(), 2);
  assertTrue( Hibernate.isInitialized(models) );
  
  s.clear();
  
  List list = s.createQuery("from Model m").list();
  for ( Iterator i=list.iterator(); i.hasNext(); ) {
   assertFalse( Hibernate.isInitialized( ( (Map) i.next() ).get("productLine") ) );
  }
  Map model = (Map) list.get(0);
  assertTrue( ( (List) ( (Map) model.get("productLine") ).get("models") ).contains(model) );
  s.clear();
  
  t.commit();
  s.close();

  s = openSession();
  t = s.beginTransaction();
  cars = (Map) s.createQuery("from ProductLine pl order by pl.description").uniqueResult();
  s.delete(cars);
  t.commit();
  s.close();
 }

 protected String[] getMappings() {
  return new String[] { "dynamic/ProductLine.hbm.xml" };
 }

 public static Test suite() {
  return new TestSuite(DynamicClassTest.class);
 }

}

配置文件:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 "

<hibernate-mapping>