I'm changing a collection of object. Next I want undo changes of the object and its collection. session.Refres for the object is not refresh collection!
How to refresh the objec and its collection(s)?

this is a very vague question and needs more detail. post some code in your example. the answre could be a simple as calling some NH code or as complex as implementing the Memento Pattern...

-devon

There are two classes. Class1 containa collection of Collection1Items.

public class Calss1
{
private IList m_Collection1 = new ArrayList();
public IList Collection1
{
get { return m_Collection1; }
set {m_Collection = value; }
}

...
}

public class CollectioItem1
{
private Class1 m_Class1;
public Class1 Class1
{
get { return m_Class1; }
set {m_Class1 = value; }
}

...
}

Mapping:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">

<class name="Domain.Class1, Domain" table="CLASS1" dynamic-update="true" dynamic-insert="true">
<id name="Id" column="id" type="Int64" unsaved-value="0">
<generator class="Persistence.TableGeneratorUltra, Persistence">
<param name="table">unique_key</param>
<param name="id">class1_id</param>
</generator>
</id>
<bag name="Collection1" table="COLLECTION1ITEM" inverse="true" lazy="true" cascade="delete-orphan">
<key column="CLASS1_ID"/>
<one-to-many class="Domain.Collection1Item, Domain"/>
</bag>

...

</class>

<class name="Domain.Collection1Item, Domain" table="COLLECTION1ITEM" dynamic-update="true" dynamic-insert="true">
<id name="Id" column="id" type="Int64" unsaved-value="0">
<generator class="Persistence.TableGeneratorUltra, Persistence">
<param name="table">unique_key</param>
<param name="id">collection1item_id</param>
</generator>
</id>
<many-to-one name="Class1" column="CLASS1_ID" class="Domain.Class1, Domain" not-null="true"/>

...

</class>

</hibernate-mapping>

foo()
{
--open session...

Class1 class1 = session.Load(typeof(Class1), id);

--actions where lazy collection Collection1 is loading and takes place some changes of Colection1's and Class1' properties

if(true)
{
-- hire I want undo changes that was made above (I needn't save changes!)

session.Refresh(class1);

-- Method Refresh refreshed only class1 and its properties but NOT collection!

-- HOW CAN I REFRESH COLLECTION ???
}

--close session.
}

I don't really know the answer to this question as I haven't used refresh, but I'll give it a try anyway..

First you can try is cascade="all-delete-orphan" instead of just "delete-orphan".
Otherwise you might have to do the refresh at the collection explicitly: session.Refresh(class1.Collection1)

session.Refresh() isn't going to do it becaus the collection is lazily loaded. you are probably running into first level session cache issues-- second-level cache issues if you've got that enabled as well. so here are a few suggestions:

Initialize the child collection:


this isn't the best solution because you'll have to do the same for class1.Collection2, etc. another alternative is to:


this forces NH to sync the "in-memory" object with the database, reading the database and discarding the in-memory changes. however, this is more accurately used for reattaching an object to a new session. the next time you use your collection, it should load the collection from the db.

you could simply "reload" the object. this is probably your best bet:


i don't think Memento would work here because you aren't supposed to replace an entire collection....

-devon

Thanks, third case is sutable for my purpose.