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This page (revision-12) was last changed on 18-Aug-2014 15:03 by Dieter Käppel

This page was created on 13-Dec-2010 16:31 by Dieter Käppel

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Version Date Modified Size Author Changes ... Change note
12 18-Aug-2014 15:03 7 KB Dieter Käppel to previous
11 18-Aug-2014 15:03 5 KB Dieter Käppel to previous | to last
10 04-Jul-2014 13:19 4 KB Dieter Käppel to previous | to last
9 29-Dec-2012 13:07 3 KB Dieter Käppel to previous | to last
8 30-Nov-2012 13:40 5 KB Dieter Käppel to previous | to last
7 24-Nov-2012 11:54 5 KB Dieter Käppel to previous | to last
6 23-Nov-2012 21:02 4 KB Dieter Käppel to previous | to last
5 23-Nov-2012 08:12 4 KB Dieter Käppel to previous | to last
4 01-Nov-2012 23:48 3 KB Dieter Käppel to previous | to last
3 15-Dec-2010 13:23 1 KB Dieter Käppel to previous | to last
2 15-Dec-2010 11:00 1 KB Dieter Käppel to previous | to last
1 13-Dec-2010 16:31 300 bytes Dieter Käppel to last

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At line 36 changed 2 lines
!!!Spring Open EntityManager once in View Pattern
web.xml:
!!!Lazy-Loading und Transaction Management
Es ist praktikabel, das JPA Transaction Management zusammen mit Spring zu verwenden (Annotation <tx:annotation-driven/>). Für die View kann dann der OpenEntityManagerInViewFilter verwendet werden, um Paging und Lazy-Loading zu realisieren:
At line 40 changed 2 lines
<filter-name>EntityManagerFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
<filter-name>OpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
At line 44 changed one line
<filter-name>EntityManagerFilter</filter-name>
<filter-name>OpenEntityManagerInViewFilter</filter-name>
At line 49 changed 2 lines
!!!Spring Open EntityManager in Session
Es ist eher praktikabel, das JPA Transaction Management zusammen mit Spring zu verwenden (Annotation <tx:annotation-driven/>). Für die View kann dann der OpenEntityManagerInViewFilter verwendet werden, um Paging und Lazy-Loading zu realisieren.
Der EntityManager kann allerdings die Session nur öffnen, wenn der Hibernate-Parameter dafür gesetzt ist (etwa in der persistence.xml):
At line 52 removed 2 lines
Dennoch hier der Code:
At line 55 changed 43 lines
public class OpenEntityManagerInSessionFilter extends OncePerRequestFilter {
public static final String ENTITY_MANAGER_FACTORY_NAME = "entityManagerFactory";
public static final String ENTITY_MANAGER_NAME = "entityManager";
private String entityManagerFactoryBeanName = ENTITY_MANAGER_FACTORY_NAME;
public void setEntityManagerFactoryBeanName(String entityManagerFactoryBeanName) {
this.entityManagerFactoryBeanName = entityManagerFactoryBeanName;
}
public String getEntityManagerFactoryBeanName() {
return entityManagerFactoryBeanName;
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
EntityManagerFactory entityManagerFactory = lookupEntityManagerFactory();
boolean participate = false;
try {
if (TransactionSynchronizationManager.hasResource(entityManagerFactory)) {
participate = true;
} else {
EntityManager entityManager = (EntityManager)request.getSession().getAttribute(ENTITY_MANAGER_NAME);
if (entityManager == null) {
entityManager = entityManagerFactory.createEntityManager();
request.getSession().setAttribute(ENTITY_MANAGER_NAME, entityManager);
}
TransactionSynchronizationManager.bindResource(
entityManagerFactory, new EntityManagerHolder(entityManager));
}
filterChain.doFilter(request, response);
} finally {
if (!participate)
TransactionSynchronizationManager.unbindResource(entityManagerFactory);
}
}
protected EntityManagerFactory lookupEntityManagerFactory() {
WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
return (EntityManagerFactory) wac.getBean(getEntityManagerFactoryBeanName(), EntityManagerFactory.class);
}
}
<property name="hibernate.enable_lazy_load_no_trans" value="true"/>
This page (revision-12) was last changed on 18-Aug-2014 15:03 by Dieter Käppel Top
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