FreeTDS Development Group

["Lowden, James K" <LowdenJK AT bernstein.com>]

> From: Thompson, Bill D (London)
> Sent: Tuesday, March 08, 2005 6:01 AM
> 
> your next call to dblibrary *might* fail with a "results pending" type
> error though, if you tray and do another operation on the same channel

What "might"?  *Will* fail, period.  

The code below doesn't tell the server to stop sending rows, and doesn't
tell the library the that the result set was exhausted/cancelled.
db-lib maintains information about the state of the connection, and will
refuse to send another query.  Anything else is a bug.  

The only exception would be if the last row fetched happened also to be
the last row sent, i.e., the last row of the result set.  Some
implementations of db-lib (not FreeTDS, afaik), will note the
end-of-rowset packet and update the internal connection status
automatically.  Others will not do so until dbnextrow returns
NO_MORE_ROWS.  

Am I missing something?  

--jkl


> 
> -----Original Message-----
> From: freetds-bounces AT lists.ibiblio.org
> [mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of craigs
> Sent: 08 March 2005 10:58
> To: FreeTDS Development Group
> Subject: Re: [freetds] dbnextrow() question
> 
> 
> found an easier way of doin it.
> 
> while (dbnextrow(dbconn) != NO_MORE_ROWS)
> {
>       if ( find what i want )
>       {
>             do something here
>             now exit doing the following
> 
>           return NO_MORE_ROWS; // this will let you exit
>       }
> }
> 
> 
> Thompson, Bill D (London) wrote:
> 
> >Shaun
> >
> >see dbcanquery() or dbcancel() . dbcanquery looks like exactly what
you
> >want.
> >
> >-----Original Message-----
> >From: freetds-bounces AT lists.ibiblio.org
> >[mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of craigs
> >Sent: 04 March 2005 12:19
> >To: FreeTDS Development Group
> >Subject: [freetds] dbnextrow() question
> >
> >
> >Could someone tell me how to exit this loop?  I dont want to run
> through
> >
> >thousands of unnecessary records when i find the one i want.
> >
> >while (dbnextrow(dbconn) != NO_MORE_ROWS)
> >{
> >      if ( find what i want )
> >      {
> >            do something here
> >            now i want to exit out off this loop
> >      }
> >}
> >
> >Shaun

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