This works - thank you
Annette Scherer Abteilung Informatik -----Ursprüngliche Nachricht----- Von: Pinaki Poddar [mailto:ppod...@apache.org] Gesendet: Dienstag, 28. Juli 2009 20:56 An: users@openjpa.apache.org Betreff: Re: update an remove in distributed environments merge() returns the updated or 'merged' instance. So please try this and see if that works... public void remove(Object entity) { try { EntityManager em = this.getEm(); Object merged = em.merge(entity); em.remove(merged); } catch (Throwable t) { t.printStackTrace(); } } Scherer, Annette wrote: > > Hello, > > I am using OpenJPA in a client/server environment. > I need to persist, find or query an object, update it and remove it. > > How can I do this? As explained in OpenJPA's Manual Part 2, Chapter 8.2, I > tried to merge the object bevor removing it. But this doesn work. > > This is my example: > > Client: > > TestObject test = new TestObject(); > test.setNumber(22); > test.setName("Test22"); > Class testClass = test.getClass(); > > try{ > ... sessionBeanHome.persist(test); > } catch (Throwable e) { > System.out.println(e.getMessage()); > } > > TestObject testRead = null; > try { > testRead = (TestObject)... sessionBeanHome.find(testClass, > test.getNumber()); > } catch (Throwable e) { > System.out.println(e.getMessage()); > } > > try { > ... sessionBeanHome.remove(testRead); > } catch (Throwable e){ > System.out.println(e.getMessage()); > } > > > > Server (2.1 SessionBean): > > public void persist(Object entity) { > try { > this.getEm().persist(entity); > } catch (Throwable t) { > t.printStackTrace(); > } > } > > > public Object find(Class entityClass, Object primaryKey) { > Object result = null; > try { > result = this.getEm().find(entityClass, primaryKey); > } catch (Throwable t) { > t.printStackTrace(); > } > return result; > } > > public void remove(Object entity) { > try { > EntityManager em = this.getEm(); > em.merge(entity); > em.remove(entity); > } catch (Throwable t) { > t.printStackTrace(); > } > } > > > My persistence.xml > > <persistence xmlns="http://java.sun.com/xml/ns/persistence"; > xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; > xsi:schemaLocation="http://java.sun.com/xml/ns/persistence > http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"; > version="1.0"> > <persistence-unit name="Test_DB"> > <provider> > org.apache.openjpa.persistence.PersistenceProviderImpl > </provider> > <jta-data-source>java:comp/env/jdbc/testdb</jta-data-source> > <class>de.huk.vtp.selektionen.bo.TestObject</class> > <properties> > <property name="openjpa.TransactionMode" > value="managed"/> > <property name="openjpa.ConnectionFactoryMode" > value="managed"/> > <property name="openjpa.jdbc.DBDictionary" value="db2"/> > <property name="openjpa.jdbc.Schema" value="T7"/> > </properties> > </persistence-unit> > </persistence> > > > > Thank you for advice > > Annette Scherer > Abteilung Informatik > > > ----- Pinaki -- View this message in context: http://n2.nabble.com/update-an-remove-in-distributed-environments-tp3343960p3345291.html Sent from the OpenJPA Users mailing list archive at Nabble.com.
