如何在NHibernate中添加嵌套事务？

<property name="current_session_context_class">NHibernate.Context.ThreadStaticSessionContext</property>
<property name="connection.release_mode">on_close</property>
<property name="adonet.batch_size">100</property>
<property name="show_sql">false</property>
<property name="format_sql">false</property>
<property name="use_outer_join">true</property>
<property name="command_timeout">60</property>
<property name="query.substitutions">true 1, false 0, yes 'Y', no 'N'</property>
<property name="proxyfactory.factory_class">NHibernate.ByteCode.Castle.ProxyFactoryFactory, NHibernate.ByteCode.Castle</property>
<property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
<property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
<property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
<property name="connection.connection_string">your_connection_string</property>

using (ISession session = sessionFactory.OpenSession())
{
    using (ITransaction transaction = session.BeginTransaction())
    {
        // 在这里执行你的数据库操作

        transaction.Commit();
    }
}

using (ISession session = sessionFactory.OpenSession())
{
    using (ITransaction transaction = session.BeginTransaction())
    {
        // 在这里执行你的数据库操作

        using (ITransaction nestedTransaction = session.BeginTransaction())
        {
            // 在嵌套事务中执行更细粒度的数据库操作

            nestedTransaction.Commit();
        }

        transaction.Commit();
    }
}