You can just copy the SequenceGenerator code from
https://nhibernate.svn.sourceforge.net/svnroot/nhibernate/trunk/nhibernate/src/NHibernate/Id/SequenceGenerator.cs
Diego
On Thu, Aug 5, 2010 at 12:19, Waqar Sadiq <[email protected]> wrote:
> SchemaUpdate won't work for me because if that entity needs to be
> deleted then I still have to use SchemaExport that will drop the
> sequence.
>
> The best solution for me is to create my own sequence generator by
> inheriting from NHibernate.Id.SequenceGenerator and override its
> SqlDropString method to return an empty array. That would have been
> perfect. However, the problem is that even though this is an
> implementation of the method from IPersistentIdentifierGenerator, it
> is not declared as "virtual". So when I derive my own generator and
> use it, SequenceGenerator.SqlDropString. It would have been nice if
> that method was declared as virtual so that I vould override it. I
> would hate to modify nhibernate's source and then have to maintain its
> build in my environment.
>
> Is there anything in C# that would allow me to accomplish the
> overriding of a non-virtual method.
>
> I tried this and it did not work.
>
> public new string[] SqlDropString(NHibernate.Dialect.Dialect dialect)
> {
> return new string[0];
> }
>
> This still calls the base class's method.
>
> Any help is appreciated.
>
>
> On Aug 4, 9:56 pm, Diego Mijelshon <[email protected]> wrote:
> > Have you tried with SchemaUpdate instead of SchemaExport?
> > (I have absolutely no idea if it works)
> >
> > Diego
> >
> >
> >
> > On Wed, Aug 4, 2010 at 20:56, Waqar Sadiq <[email protected]> wrote:
> > > Hi,
> >
> > > I am using NHibernate 2.1.2 and the underlying database is Oracle. I
> > > am running into a problem but before explaining the problem, I want to
> > > explain some functionality in my application.
> >
> > > This application allows the user to cerate a data model. For each
> > > entity that they create in the data model, I generate a C# class, a
> > > mapping file and the corresponding table in the database. Later if
> > > they add a new entity to the data model, its corresponding class,
> > > mapping files are generated and the assembly is rebuilt. All the C#
> > > classes and mapping files are complied into an assembly and this
> > > assembly is later used to initialize a hibernate session. Always, the
> > > table is created by creating a Configuration object that has the
> > > mapping for the table that needs to be created and then SchemaExporter
> > > is used. The following code cerates the table.
> >
> > > //////////////////// begin code //////////////////////////
> > > Configuration cfg = new Configuration();
> > > IDictionary<string, string> properties = new Dictionary<string,
> > > string>();
> > > properties.Add("dialect", dinfo.dialect);
> > > properties.Add("connection.provider",
> > > "NHibernate.Connection.DriverConnectionProvider");
> > > properties.Add("connection.driver_class", dinfo.driver);
> > > properties.Add("connection.connection_string", db_connectionString);
> > > cfg.AddProperties(properties);
> > > cfg.AddResource("mapping name", "assembly name");
> >
> > > SchemaExport se = new SchemaExport(cfg);
> > > se.SetDelimiter (";");
> > > se.Execute(true, true, false);
> > > //////////////////////////////////////////////////////////////
> >
> > > That all works but a specific problem has surfaced.
> >
> > > The generated mappings use the "sequence" generator for id
> > > generation. For some desired behavior, all entities share the same
> > > sequence for id. So when a new table is created, hibernate
> > > essentially resets the underlying sequence.
> >
> > > Is there anyway to tell hibernate not to reset the sequence if it
> > > already exists?
> >
> > > Thanks for your help.
> >
> > > Waqar
> >
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