Re: Reade & Chain

["Simon Coulter" <shc@xxxxxxxxxxxxxxxxx>]

M
Hello Dave,

And the not so insignificant difference that CHAIN returns the data and SETLL 
doesn't therefore 
if you are only checking for existence use SETLL with the EQ indicator.  If you 
want the data 
then use CHAIN rather than SETLL and READE -- even on the 'normal' file 
processing loop -- 
unless you are not looking for a matching record.

Regards,
Simon Coulter.

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//--- forwarded letter -------------------------------------------------------
> Date: ? Tue, 26 Oct 1999 21:31:26 ? +1000
> From: dkahn@cix.co.uk
> To: RPG400-L@midrange.com
> Reply-To: RPG400-L@midrange.com
> Subject: Re: Reade & Chain

> 
> On Sun, 24 Oct 1999 20:43:51 -0500 David Gibbs (david@midrange.com)wrote:
> 
> > At 10:15 PM 10/20/99 , you wrote:
> > >    What is the difference in the reading using READE and CHAIN 
> > > opcodes?.
> > 
> > CHAIN is like doing a SETLL followed by a READE.
> 
> There is a small but sometimes very important difference. CHAIN sets the 
> file position if the record is found, but doesn't alter it if the 
> record is not found. SETLL always sets the file position.
> 
> Regards,
> 
> Dave Kahn

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