Hi there,
I've been lurking this mailing list for a while and this is my first post. :-)
My model is a matrix, like this:
class Matrix {
IEnumerable <Column> ColumnSet { get; }
IEnumerable <Row> RowSet { get; }
void AddColumn(Column c);
void AddRow(Row r);
}
class Column
{
Matrix Matrix { ... }
}
class Row
{
Matrix Matrix { ... }
IEnumerable<Element> ElementSet { get; }
}
class Element {
Int32 Value { get; }
Row Row { get; }
Column Column { get; }
}
Every class has an Id property, whici is of Guid type.
When I add a Column (AddColumn() method), automatically a new Element
is added for each Row in the RowSet.
When I add a Row (AddRow() method), automatically an element for each
Column in the ColumnSet si added to the Row I'm adding.
In the mapping files, for Matrix/Column/Row/Element I've set:
cascade="all-delete-orphan". I need to handle one session only to
read data in their actual persistent state (in a sort of db polling):
Guid id = ...;
ISessionFactory sf = ...;
using (ISession sf.OpenSession())
{
Element e = s.Get<Element>(id);
//something here;
}
..and another session to rea/write data:
int newValue = ...;
ISession s = ...;
Element r = ...;
using (ITransaction tx = s.BeginTransaction())
{
e.Value = newValue;
s.SaveOrUpdate(e);
tx.Commit();
}
and here I get an "Illegal attempt to associate a collection with two
open sessions".
As I'm quite a newbie, my my questions are:
1. What does it mean? ;-)
2. How can I fix it?
Thanks in advance. Have a nice day/week,
Giulio
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