>From: "Nanduri, Amarnath" <[EMAIL PROTECTED]>
>Reply-To: [EMAIL PROTECTED]
>To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
>Subject: RE: Struts questions for evaluation
>Date: Mon, 7 May 2001 08:20:00 -0400
>
>me too
>
>-----Original Message-----
>From: Jonathan Asbell [mailto:[EMAIL PROTECTED]]
>Sent: Monday, May 07, 2001 8:21 AM
>To: [EMAIL PROTECTED]; [EMAIL PROTECTED]
>Subject: Re: Struts questions for evaluation
>
>
>I am interested in the code. Please send.
>
> > Hello Struts users,
> >
> > We are currently evaluating Struts and other web (MVC) frameworks and
>would like to ask you some questions:
> >
> > - Is there some struts-config XML-generation from some
> > modeling tool (Rose for instance) ?
> >
> > We would like to design a state or activity diagram in
> > such a tool then generate the navigation XML file.
> >
> > - Can struts behave like a real state machine ?
> >
> > i.e. how to ensure that some Action is performed only if
> > another Action (or view but is not ideal) has been
> > performed with some result (success to be simple). We
> > would like this to be Struts-controlled, not developper-
> > controlled (check session variables, etc.).
> >
> > We found the built-in Struts token system but this seem
> > only to be used to demarcate transactions in a set of
> > views. This allow to demarcate a transaction end (token
> > value change) but not an inconstency within the
> > transaction (i.e. i valide twice the first page of the
> > transaction) as the token value will not change.
>
>I hit the same weakness of struts a few months ago and I enhanced some
>struts
>classes in order to be able for each action to specify which action has to
>precede this action. This allows you to implement some kind of control flow.
>For
>instance you can now define an action that displays a logon page
>(displayLogon)
>and specify in the next action (logonAction, which gets executed when the
>user
>presses the submit button of the logon page) that displayLogon needed to be
>executed directly before. This is more powerful than the token mechanism.
>
>What I also did at the same time is an enhanced user authentication checking
>for
>each action. You can now specify a different user authorization class for
>each
>action, so you can easily implement a very fine grained user authorization.
>
>Exceptions (either control flow or user authentication exceptions) are
>handled
>by the framework and cause a forward to different error pages.
>
>I plan to propose this enhancement to the struts developer's group after
>release
>1.0 is out. If you are interested in the meantime I can send you the code.
>
> > - Why does the struts-example perform some scoped-
> > variables cleanup at the end of every Action ?
> >
> > As these variables are defined as scoped in the struts-
> > config XML file, they should naturally live during the
> > specified scope lifetime. We don't understand that in the
> > struts-example (maybe this is not mandatory).
>
>My understanding is: For request scope you normally do not need to clean up,
>because the object gets removed automatically, when the request is served.
>For
>the session scope you pretty often want to remove e. g. a form bean, when it
>is
>no longer needed to keep your session data lean.
>
> > Thank you very much for your informations about Struts.
> >
> > Laurent.
>
>--- Matthias
>----- Original Message -----
>From: "Matthias Bauer" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Monday, May 07, 2001 4:05 AM
>Subject: Re: JDBC driver specific functionality/GenericConnections
>
>
> > > Hello,
> > >
> > > I would like to access functionality specific to the MM MySql driver in
>an
> > > application that uses Struts' datasource pool and am having a bit of
> > > troubling casting a GenericConnection back to an
> > > org.gjt.mm.mysql.Connection. Casting from a GenericConnection to an
> > > org.gjt.mm.mysql.Connection results in a class cast exception; casting a
> > > Statement or PreparedStatement generated by the GenericConnection
>produces a
> > > null pointer exception. I am working with Struts 1.0-beta-1 and MM Mysql
> > > 2.0.4.
> > >
> > > If it sheds any light on the problem, the MM function I would like to
>access
> > > is PreparedStatement.getLastInsertID(). Has anyone successfully
>prosecuted
> > > this?
> >
> > You must not cast GenericConnection to What you really want to do is call
> > DataSource.getConnection which returns a Connection object like so:
> >
> > DataSource ds = getServlet().findDataSource(null);
> > Connection con = ds.getConnection();
> >
> > You can cast this connection to org.gjt.mm.mysql.Connection without any
> > problems!
> >
> >
> > > On a tangential note--why is the getConnection() method in
>GenericConnection
> > > private? Were it public, I assume I could use it to get an MM Connection
>and
> > > execute MySql specific functions to my heart's content.
> >
> > You should never need to call GenericConnection.getConnection()! What you
>want
> > to do is always call DataSource.getConnection(), as stated above.
> >
> > > Thanks is advance,
> > > David
> >
> > Hope this helps,
> >
> > --- Matthias
> >
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