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From: Michael Peppler <mpeppler at peppler dot org>
Subject: Re: Moving to a specific row
Date: Aug 31 2000 6:31PM

ye, wei writes:
 > Michael Peppler wrote:
 > 
 > > Andrew Armstrong writes:
 > >  > I routinely have to report large numbers of database table rows to a web page
 > >  > and was having a problem limiting the number of rows I display using the
 > >  > standard CTlib methods. I can use set rowcount xxxx but this only limits the
 > >  > resultset to the first xxxx rows. I want to be able to move the resultset to a
 > >  > row that I choose. I can do this in PHP and was wondering how the best way to do
 > >  > this in Perl would be.
 > >  >
 > >  > The only solution that i have found is to call ct_fetch() xxxx times and ignore
 > >  > the results or to use ct_sql to move the results into an array and start at the
 > >  > xxxx element. Neither of these seem very good for system performace.
 > >  >
 > >
 > > I don't see how PHP could do this any better than perl. It is limited
 > > by what Sybase understands, and in this particular case it is limited
 > > by the way SQL works.
 > 
 > Just read PHP Sybase module, it seems that in sybase_query(), it reads
 > *ALL* results into memory, then it can use sybase_data_seek() to locate record
 > position later.

Right - you could do the same thing using ct_sql() (or
Sybase::Simple's ArrayOfHash()). The downside for sybperl is that the
code is implemented in perl, which would be a little slower than C.

I hope PHP has some row limit so that a runaway query doesn't crash
the webserver...

Michael
-- 
Michael Peppler         -||-  Data Migrations Inc.
mpeppler@peppler.org    -||-  http://www.mbay.net/~mpeppler
Int. Sybase User Group  -||-  http://www.isug.com
Sybase on Linux mailing list: ase-linux-list@isug.com