Finding Dirty Properties in NHibernate

Ricardo Peres — Mon, 20 Jun 2011 11:35:01 GMT

Current revision posted to How to by Ricardo Peres on 20/06/2011 08:35:01 a.m.

Finding Dirty Properties in NHibernate

Filed under: Session, Architecture, Session

UPDATE: now deals properly with proxies.

The following extension methods to ISession allow finding if a property or entity has changed, and the original value of a property.

public static class SessionExtensions

{

public static Boolean IsDirtyEntity(this ISession session, Object entity)

{

String className = NHibernateProxyHelper.GuessClass(entity).FullName;

ISessionImplementor sessionImpl = session.GetSessionImplementation();

IPersistenceContext persistenceContext = sessionImpl.PersistenceContext;

EntityEntry oldEntry = persistenceContext.GetEntry(entity);

String className = oldEntry.EntityName;

IEntityPersister persister = sessionImpl.Factory.GetEntityPersister(className);

EntityEntry oldEntry = sessionImpl.PersistenceContext.GetEntry(entity);

if ((oldEntry == null) && (entity is INHibernateProxy))

{

INHibernateProxy proxy = entity as INHibernateProxy;

Object obj = sessionImpl.PersistenceContext.Unproxy(proxy);

oldEntry = sessionImpl.PersistenceContext.GetEntry(obj);

}

Object [] oldState = oldEntry.LoadedState;

Object [] currentState = persister.GetPropertyValues(entity, sessionImpl.EntityMode);

     Int32 [] dirtyProps = oldState.Select((o, i) => (oldState [ i ] == currentState [ i ]) ? -1 : i).Where(x => x >= 0).ToArray();

return (dirtyProps != null);

}

public static Boolean IsDirtyProperty(this ISession session, Object entity, String propertyName)

{

String className = NHibernateProxyHelper.GuessClass(entity).FullName;

ISessionImplementor sessionImpl = session.GetSessionImplementation();

IPersistenceContext persistenceContext = sessionImpl.PersistenceContext;

EntityEntry oldEntry = persistenceContext.GetEntry(entity);

String className = oldEntry.EntityName;

IEntityPersister persister = sessionImpl.Factory.GetEntityPersister(className);

EntityEntry oldEntry = sessionImpl.PersistenceContext.GetEntry(entity);

if ((oldEntry == null) && (entity is INHibernateProxy))

{

INHibernateProxy proxy = entity as INHibernateProxy;

Object obj = sessionImpl.PersistenceContext.Unproxy(proxy);

oldEntry = sessionImpl.PersistenceContext.GetEntry(obj);

}

Object [] oldState = oldEntry.LoadedState;

Object [] currentState = persister.GetPropertyValues(entity, sessionImpl.EntityMode);

Int32 [] dirtyProps = persister.FindDirty(currentState, oldState, entity, sessionImpl);

Int32 index = Array.IndexOf(persister.PropertyNames, propertyName);

Boolean isDirty = (dirtyProps != null) ? (Array.IndexOf(dirtyProps, index) != -1) : false;

return (isDirty);

}

public static Object GetOriginalEntityProperty(this ISession session, Object entity, String propertyName)

{

String className = NHibernateProxyHelper.GuessClass(entity).FullName;

ISessionImplementor sessionImpl = session.GetSessionImplementation();

IPersistenceContext persistenceContext = sessionImpl.PersistenceContext;

EntityEntry oldEntry = persistenceContext.GetEntry(entity);

String className = oldEntry.EntityName;

IEntityPersister persister = sessionImpl.Factory.GetEntityPersister(className);

EntityEntry oldEntry = sessionImpl.PersistenceContext.GetEntry(entity);

if ((oldEntry == null) && (entity is INHibernateProxy))

{

INHibernateProxy proxy = entity as INHibernateProxy;

Object obj = sessionImpl.PersistenceContext.Unproxy(proxy);

oldEntry = sessionImpl.PersistenceContext.GetEntry(obj);

}

Object [] oldState = oldEntry.LoadedState;

Object [] currentState = persister.GetPropertyValues(entity, sessionImpl.EntityMode);

Int32 [] dirtyProps = persister.FindDirty(currentState, oldState, entity, sessionImpl);

Int32 index = Array.IndexOf(persister.PropertyNames, propertyName);

Boolean isDirty = (dirtyProps != null) ? (Array.IndexOf(dirtyProps, index) != -1) : false;

return ((isDirty == true) ? oldState [ index ] : currentState [ index ]);

}

Finding Dirty Properties in NHibernate

Ricardo Peres — Thu, 14 Apr 2011 20:59:56 GMT

Revision 6 posted to How to by Ricardo Peres on 14/04/2011 05:59:56 p.m.