FreeTDS Development Group

["James K. Lowden" <jklowden AT schemamania.org>]

On Fri, 3 Oct 2003, "Knygh, Øyvind" <oyvind.knygh AT brreg.no> wrote:
> I have problems using function dbhasretstat() and dbretstatus(). 
> Here is the db-lib code in C using FreeTDS. What's wrong with 
> this?? I get
> no info from dbretstatus(). I call this stored procedure 
> several times. The
> first time it looks like dbhasretstat(dbproc) = FALSE why?

Bill's advice is good.  I think Microsoft's documentation is clear,
though:

"call dbhasretstat after dbresults returns NO_MORE_RPC_RESULTS ... or
NO_MORE_RESULTS...."

>From what I've seen, the server always returns data in following order:

1.  Regular rows.
2.  Compute rows.
3.  Output parameters, in order.
4.  Return status.  

Obviously, 1 & 2 may be repeated.  

Although it's possible for db-lib to "peek ahead" a little bit, FreeTDS
doesn't.  The return status isn't fetched from the wire until the
application attempts to read the past the end of the returned data (parts
1-3).  

HTH.

--jkl

>    dbfcmd (dbproc, " exec oko_chk_apar_id @apar_id=%ld,",apar_id); /*
> Kundenr */
>    dbcmd  (dbproc, "                      @apar_type='R',"); /*
> Reskontrotype */
>    dbfcmd (dbproc, "                      
> @client='%s'",client); /* Firma
> */
>    if (dbsqlexec (dbproc) == FAIL)
>    {
>       printf ("Feil i SQL-query. - exec oko_chk_apar_id
> @apar_id=%ld,\n",apar_id);
>       printf ("                                         
> @apar_type='R',\n");
>       printf ("
> @client='%s'\n",client);
>       return(-1);
>    }
>    while ((result_code = dbresults(dbproc)) != NO_MORE_RESULTS)
>    {
>       if (result_code == SUCCEED)
>       {
>          dbbind(dbproc, 1, INTBIND, (DBINT) 0, (BYTE *) &status2);
>          while (dbnextrow(dbproc) != NO_MORE_ROWS)
>          {
> 
>             printf("\nStep 2 Sjekk_Acuheader Inne i dbresults
> status2=%ld\n",status2);
>          }
>               
>          if ( dbhasretstat(dbproc) )
>          {          
>              status=dbretstatus(dbproc);
>              if (status==1)
>              {
>                 return 1;    /* Kunde finnes ikke i AGRESSO */
>              }
>              else if (status == 0 )
>              {
>                 return 0; /* Kunde finnes i AGRESSO */
>              }
>              else if (status < 0)  /* Noe feilet */
>              {
>                 printf ("Feil, dbhasretstat: status=%ld\n",status);
>                 return (-1);
>             }
>          }
>          if (status2==1)
>          {
>             return 1;    /* Kunde finnes ikke i AGRESSO */
>          }
>          else if (status2 == 0 )
>          {
>             return 0; /* Kunde finnes i AGRESSO */
>          }
>       }
>       else
>       {
>          printf ("Results Failed\n");
>          break;
>       }
>    }
> 
> 
> Øyvind