Ich verwende Persistenz in einem Projekt für die Schule, und ich habe ein Problem, wenn ich versuche zu löschen und zu aktualisieren, funktioniert alle anderen Abfragen.Hibernate illegaler Versuch, eine Sammlung mit zwei offenen Sitzungen zu verknüpfen
Die Ausnahme ist:
Illegal attempt to associate a collection with two open sessions
Ich schließe jede Sitzung, die ich geöffnet haben.
HibernateUtils Code
public class Hibernate
{
protected static final SessionFactory sessionFactory;
private Session session;
static
{
try
{
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
session
}
catch (Throwable ex)
{
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public void create(Object obj)
{
this.session = sessionFactory.openSession();
session.getTransaction().begin();
session.save(obj);
session.getTransaction().commit();
session.close();
}
public void refresh(Object obj)
{
this.session = sessionFactory.openSession();
session.getTransaction().begin();
session.refresh(obj);
session.getTransaction().commit();
session.close();
}
public void update(Object obj)
{
this.session = sessionFactory.openSession();
session.getTransaction().begin();
session.saveOrUpdate(obj);
session.getTransaction().commit();
session.close();
}
public void delete(Object obj)
{
this.session = sessionFactory.openSession();
session.getTransaction().begin();
session.delete(obj);
session.flush();
session.getTransaction().commit();
session.close();
}
protected String protectString(String toProtect)
{
return (toProtect.replace("'", "''"));
}
}
DAOPerson:
public class DAOPerson extends Hibernate
{
public void remove(Person p)
{
if (p instanceof Student)
{
Student s = (Student)p;
Set<persistenceClass.Class> set = s.getClasses();
Iterator<persistenceClass.Class> it = set.iterator();
while (it.hasNext())
{
persistenceClass.Class r = it.next();
r.getStudents().remove(s);
}
p.getBirthCountry();
p.getCountry();
this.delete(p);
}
else
this.delete(p);
}
Informationen meine Mapping-Datei von Studenten ist:
<class name="persistenceClass.Person" table="T_PERSON">
<id name="Id" column="PERSON_ID">
<generator class="native" />
</id>
<property name="FirstName" column="PERSON_FIRST_NAME" not-null="true" />
<property name="LastName" column="PERSON_LAST_NAME" not-null="true" />
<property name="Type" column="PERSON_TYPE" not-null="true" />
<property name="BirthDate" column="PERSON_BIRTH_DATE" />
<property name="BirthCity" column="PERSON_BIRTH_CITY" />
<property name="PhoneNumber" column="PERSON_PHONE_NUMBER" />
<property name="MobileNumber" column="PERSON_MOBILE_NUMBER" />
<property name="Mail" column="PERSON_MAIL" />
<property name="Address" column="PERSON_ADDRESS_ADDRESS" />
<property name="ZipCode" column="PERSON_ADDRESS_ZIPCODE" />
<property name="City" column="PERSON_ADDRESS_CITY" />
<property name="Image" column="PERSON_IMAGE" type="image" />
<many-to-one name="Country" column="PERSON_ADDRESS_COUNTRY" class="persistenceClass.Country" />
<many-to-one name="BirthCountry" column="PERSON_BIRTH_COUNTRY" class="persistenceClass.Country" />
<many-to-one name="Civility" column="PERSON_CIVILITY" class="persistenceClass.Civility" />
<many-to-one name="Sex" column="PERSON_SEX" class="persistenceClass.Sex" />
<joined-subclass name="persistenceClass.Student" table="T_STUDENT">
<key column="PERSON_ID" />
<set name="Classes" table="T_CLASS_STUDENT" inverse="true" >
<key column="PERSON_ID" />
<many-to-many class="persistenceClass.Class" column="CLASS_ID" />
</set>
</joined-subclass>
<joined-subclass name="persistenceClass.Teacher" table="T_TEACHER">
<key column="PERSON_ID" />
</joined-subclass>
</class>
Und die Hauptzuordnungsdatei:
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="connection.url">jdbc:mysql://localhost/projet</property>
<property name="connection.username">root</property>
<property name="connection.password"></property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">10</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property>
<!-- Drop and re-create the database schema on start-up, also try with “update” to keep the previous values -->
<property name="hbm2ddl.auto">update</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<mapping resource="persistenceConfigurations/Person.hbm.xml"/>
<mapping resource="persistenceConfigurations/Country.hbm.xml"/>
<mapping resource="persistenceConfigurations/Civility.hbm.xml"/>
<mapping resource="persistenceConfigurations/Sex.hbm.xml"/>
<mapping resource="persistenceConfigurations/Formation.hbm.xml"/>
<mapping resource="persistenceConfigurations/Year.hbm.xml"/>
<mapping resource="persistenceConfigurations/Class.hbm.xml"/>
<mapping resource="persistenceConfigurations/Subject.hbm.xml"/>
<mapping resource="persistenceConfigurations/Room.hbm.xml"/>
<mapping resource="persistenceConfigurations/Lesson.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Ich versuche eine Menge Konfiguration, aber ich habe immer die gleiche Ausnahme, wenn jemand eine Idee haben, ich will es!
Danke!
Sorry für mein schlechtes Englisch
Könnten Sie den kompletten Stack-Trace der Ausnahme posten? –
Stack-Trace benötigt! –
mehr Informationen über ur-Code und Projekt-Setup würde auch helfen !! Die Sitzung sollte ständig ausgeführt werden, Details Ihrer DAO + Aktionsdatei/Kontrolle würden hier helfen –