FreeTDS Development Group

[craigs <s.craig AT andronics.com>]

Right having problems with this, i want to exit query when i get what i 
want, theres over 2.4 millions records in my table so really need to get 
this right, can someone advise me if the following code would work.

while ((return_code = dbresults(dbconn)) != NO_MORE_RESULTS)
{
            if (return_code == SUCCEED)
            {
                       /* Bind results to program variables. */
                       dbbind(dbconn, 1, NTBSTRINGBIND, 0, (BYTE *)& 
PlaceName);
                       dbbind(dbconn, 2, FLT8BIND, 0, (BYTE*)&Longitude);
                       dbbind(dbconn, 3, FLT8BIND, 0, (BYTE*)&Latitude);
                       dbbind(dbconn, 4, NTBSTRINGBIND, 0, (BYTE *)& 
Country);
                       dbbind(dbconn, 5, NTBSTRINGBIND, 0, (BYTE *)& Town);
                       dbbind(dbconn, 6, INTBIND, (DBINT)0, (BYTE *)& 
SweepRadius);
          
                       /* Retrieve and print the result rows. */
                       while (dbnextrow(dbconn) != NO_MORE_ROWS)
                       {
                                   tempDist = LatLonDistance( prev_lat, 
prev_lon, Latitude, Longitude );
              
                                   tempDist = tempDist * 1000; 
//convert kilometers to meters
              
                                   if ( tempDist <= SweepRadius )
                                   {
                                           /* Find what i'm looking for 
so i call a function to Insert into a table using variables above. */
                                           InsertRecord(roadsquery);
                 
                                           return NO_MORE_ROWS;
                                   }
                       }
                       dbcanquery(dbconn);
            }
}

Any help would be much appreciated, thanks.

Shaun.

craigs wrote:

> can i do the following using dbcanquery()
>
> while (dbnextrow(dbconn) != NO_MORE_ROWS)
> {
>     bind results to varialbes
>
>          if ( find what i want )
>          {
>               do something here
>                now exit doing the following
>
>             dbcanquery(dbconn);
>          }
> }
>
> will this let me exit the loop correctly with the variables still set?
>
>
>
> Thompson, Bill D (London) wrote:
>
> > Easy, cowboy.
> >
> > well, *might* is right , if you'll excuse the pun - as there is one
> > circumstance when it wouldn't go wrong.
> >
> > On the other hand, I *might* not have had the time to go into all the
> > gory details :-)
> >
> > Yours non-specifically,
> >
> > Bill
> >
> > -----Original Message-----
> > From: freetds-bounces AT lists.ibiblio.org
> > [mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of Lowden, James K
> > Sent: 08 March 2005 17:57
> > To: ml AT freetds.org
> > Subject: RE: [freetds] dbnextrow() question
> >
> >
> >  
> >
> > > 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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