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From "Raymond McDermott" <...@mcdermott.be>
Subject Re: Abator - change to allow it to produce stored procedures instead of SQL?
Date Thu, 29 Nov 2007 20:01:18 GMT
Thanks - I think you have a point for completely generic generation, which
of course would be the best use case for a framework.  I think that a little
XSLT will do what we want, so thanks for the input.

I will post the results.

On 29/11/2007, Jeff Butler <jeffgbutler@gmail.com> wrote:
>
> I did a pretty serious investigation into this a few months ago.  The
> bottom line is that it is not really feasible to do code generation for
> stored procedures.  The main issues are these:
>
> 1. The database metadata does not have enough information to fully
> understand what will be required for input and what the expected outputs
> will be for stored procedures.  In addition, since stored procedures are
> programs the outputs may differ with different inputs ( i.e. sometimes no
> result set, sometimes 1 or more result sets).  Finally, the metadata methods
> for stored procedures are all optional - so some drivers don't implement
> them at all.
>
> 2. Because of #1, it would be necessary to execute the SP with a variety
> of inputs to understand the outputs.  The XML configuration for describing
> the different input scenarios would be onerous.  And even worse - executing
> the SP solely for code generation purposes would likely have unintended side
> effects in the database.
>
> With that in mind my opinion is that stored procedures, in general, are
> not an area that would not significantly benefit from code generation.
>
> If your particular situation is that you are using SP's to simply wrap
> existing SQL, then I think an XSLT could be a good way to go - either that
> or create a custom implementation of the SqlMapGenerator interface to meet
> your particular needs.
>
> Jeff Butler
>
> On Nov 29, 2007 10:17 AM, Raymond McDermott <ray@mcdermott.be> wrote:
>
> > Our mainframe standards require us to produce SQL in the form of SQL
> > stored procedures.
> >
> > We use Db2 v7.2/zOS now (v8.1 next year).
> >
> > The template for the stored procedure is well understood and I would
> > just need to plug in the parameters and the sql.
> >
> > We like Abator for producing the original SQL but now face the problem
> > of dropping out of it once we have created the stored procedures.  This is
> > bad for changes / refactoring and we would like to retain the flexibility
> > and productivity that ABATOR offers.
> >
> > My first thought was to apply some XSLT to the output of ABATOR but then
> > I wondered if it might be smarter to provide a change to the generator so
> > that the output is simply correct.
> >
> > Any ideas on what would be the best way for me to attack this?
> >
> > Thanks
> >
> > Ray
> >
>
>

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