Re: Evaluate complex conditions

My experience is that both SQL and Query when run
interactively are tremendous resource hogs.  Both
should be run in batch or if interactive at a lower
priority/timeslice than other interactive jobs.

--- booth@martinvt.com wrote:
> You suggest that an SQL process is not a performance
> pig compared to 
> properly written RPGIV program.   Is there any
> experience out there to 
> support or confute this?
> 
> I ask because we notice that whenever one of the SQL
> gurus starts an SQL 
> process off the command line all the rest of us
> might as well go for 
> coffee until the SQL is done. 
> 
> _______________________
> Booth Martin
> Booth@MartinVT.com
> http://www.MartinVT.com
> _______________________
> 
> 
> 
> 
> Marco Facchinetti <facchinetti@yahoo.com>
> Sent by: owner-midrange-l@midrange.com
> 10/25/2000 05:28 AM
> Please respond to MIDRANGE-L
> 
>  
>         To:     MIDRANGE-L@midrange.com
>         cc: 
>         Subject:        Re: Evaluate complex
> conditions
> 
> Martin, if your purpose is a Query Tool my
> experience says
> that is better find something ready on the market.
> About performance: if an sql statement is too heavy
> the
> same one done in (eg.) RPG will take a very long
> time to be
> executed. If you got the right logical files defined
> in you
> DB you'll get good performace if not....
> Anyway if your are looking to eval or check an
> expression
> just remember tha procedure calls can be recursive,
> so you
> don't need any stack, procedures do it for you. 
> 
> Enjoy...
> 
> --- booth@martinvt.com wrote:
> > I have 4 problems with an SQL solution. 
> > 
> > 1-I don't know SQL well enough to  write the
> strings on
> > the fly. 
> > 2-Users I know can't fill in a command line string
> > suitably for an SQL 
> > solution, 
> > 3-the few instances of SQL selections I've seen
> have
> > performance pigs in 
> > that SQL would suck in the sides of the machine in
> an
> > interactive job, and 
> > even with that still respond slowly.
> > 4-giving users full flexibility with and/or
> selections
> > just doesn't work 
> > well.  Their intentions are good but the example
> given
> > yesterday is a 
> > wonderful example of the problem.  ( "give me all
> > registered voters in New 
> > Hampshire and Vermont" will list just a few
> energized
> > citizens that like 
> > to vote early and vote often.)
> > 
> > imho
> > _______________________
> > Booth Martin
> > Booth@MartinVT.com
> > http://www.MartinVT.com
> > _______________________
> > 
> > 
> > 
> > 
> > Marco Facchinetti <facchinetti@yahoo.com>
> > Sent by: owner-midrange-l@midrange.com
> > 10/24/2000 03:34 AM
> > Please respond to MIDRANGE-L
> > 
> > 
> >         To:     MIDRANGE-L@midrange.com
> >         cc: 
> >         Subject:        Re: Evaluate complex
> conditions
> > 
> > SQL?
> > --- booth@martinvt.com wrote:
> > > Terry, the only method I've been able to create
> and
> > then
> > > understand again 
> > > a week later, is to make a series of
> subroutines.  Each
> > > subroutine will 
> > > have a test for a condition and will flip a flag
> if the
> > > condition is not 
> > > met.  Something like this:
> > > 
> > >  C    Eval      DoItFlag = 'Yes'
> > >  C    Exsr    Test1
> > >  C    If         DoItFlag = 'Yes' And Test1Flag
> = 'Yes'
> > >  C    EXSR   Test1SR
> > >  C    End
> > >  C    If         DoItFlag = 'Yes' And Test2Flag
> ='Yes'
> > >  C    EXSR   Test2SR
> > >  C    End
> > >  C    If         DoItFlag = 'Yes' And Test3Flag
> = 'Yes'
> > >  C    EXSR   Test3SR
> > >  C    End
> > >   C    If         DoItFlag = 'Yes'
> > >  C    EXSR   OKToDoSR
> > >  C    End 
> > > 
> > > 
> > > _______________________
> > > Booth Martin
> > > Booth@MartinVT.com
> > > http://www.MartinVT.com
> > > _______________________
> > > 
> > > 
> > > 
> > > 
> > > Terry Grider <tgrider@arkansas.net>
> > > Sent by: owner-midrange-l@midrange.com
> > > 10/23/2000 12:43 PM
> > > Please respond to MIDRANGE-L
> > > 
> > > 
> > >         To:     MIDRANGE-L@midrange.com
> > >         cc: 
> > >         Subject:        Re: Evaluate complex
> conditions
> > > 
> > > Sorry guys,  I didn't do a very good job of
> explaining
> > > what I was looking 
> > > for.
> > > I don't mean I want code that is an example of
> testing
> > > for complex 
> > > conditions, I
> > > mean I'm looking for code that will evaluate
> statements
> > > like the one in my
> > > original example and determine the truth of the
> > > statement.  You see, I'm 
> > > writing
> > > a query tool and I want the user to be able to
> provide
> > > selection criteria 
> > > in an
> > > english style IF format similar to cobol or
> other query
> > > tools I've seen. I 
> > > can
> > > currently handle simple criteria with "and/or"
> > > connectors, but I can't 
> > > seem to
> > > come up with a good method for handling multiple
> levels
> > > of parenthesis.
> > > 
> > > Terry Grider wrote:
> > > 
> > > > Has anyone ever written or seen an example of
> program
> > > code designed to
> > > > evaluate complex conditions?  For example, if
> you
> > > wanted to evaluate a =
> > > > b and (c = d or c = e or c = f).  I'm looking
> for
> > > something that can do
> > > > multiple levels of parenthesis and all
> "and/or"
> > > combinations.
> > > >
> > > > --
> > > > Terry Grider
> > > > tgrider@arkansas.net
> 
> 
=== message truncated ===


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