[freetds] Want to use fast forward cursors (SQL_CO_FFO) and MARS

ZIGLIO, Frediano, VF-IT Frediano.Ziglio at vodafone.com
Wed May 7 09:31:46 EDT 2008


> Thanks a lot Frediano,
> 
> I will give it a try ASAP.
> 
> What do you mean by "used if cursors are enabled" = 
> "server-side cursors"?
> 
> Seb
> 

Well... I solved only header problem....

> ZIGLIO, Frediano, VF-IT wrote:
> >>> Hi all,
> >>>
> >>> I had a little review of our code and found a unique "FIXME" 
> >>> to resolve:
> >>>
> >>> /* FIXME!
> >>>      } else {                    / * Use fast forward cursor * /
> >>>          r = SQLSetStmtAttr(st->stmtHandle, 
> >>> SQL_SOPT_SS_CURSOR_OPTIONS,
> >>>                             (SQLPOINTER) SQL_CO_FFO, 
> >> SQL_IS_UINTEGER);
> >>>          if (!SQL_SUCCEEDED(r)) {
> >>>              DBGMSG(1, "Could not set 
> SQL_SOPT_SS_CURSOR_OPTIONS");
> >>>              return -1;
> >>>          }
> >>> */
> >>>
> >>> With the native SQL Server ODBC drivers (SNAC and MDAC), 
> this option
> >>> can be used from the odbcss.h header.
> >>>
> >>> Are there any plans to support this?
> >>>
> >>> BTW: What about MARS (Multiple Active Result Sets)?
> >>>
> >>> Thanks a lot!
> >>> Seb
> >> Currently there is no plan. However there are some things 
> that we need
> >> to address. ODBC has mainly ABI compatibility for constants. 
> >> That is the
> >> same constant has the same value on all platforms. Constants 
> >> defined in
> >> odbcss.h are not (correctly) in standard headers so we must 
> >> define these
> >> constants in some way. Where to define these constants? 
> >> Should we create
> >> a tdsodbcss.h header?? Or should we install it as 
> odbcss.h?? Should we
> >> install this header or not?? I think that these constant should be
> >> defined when tdsodbc.h is included (this not means that these 
> >> constants
> >> have to be defined in tdsodbc.h!) so c source files won't change.
> >>
> > 
> > Solved
> > 
> >> And back to fast forward cursors, when is it possible to set fast
> >> cursors? Only after setting some types of cursors? Does 
> setting fast
> >> cursors can change cursor type? Setting fast forward cursors 
> >> is just an
> >> advise that is used only with some cursors type (that is you 
> >> can set for
> >> all cursor types but used only on some values) or setting 
> >> with improper
> >> cursor type give error/warning ?? And what happen if we try to move
> >> cursor position on a read-only forward only cursor (this 
> >> apply not only
> >> to fast forward) ?? I think all these questions should we 
> >> answered with
> >> a test.
> >>
> > 
> > It's just an advise, it doesn't give any error, is used if 
> cursors are
> > enabled.
> > 
> > freddy77
> > _______________________________________________
> > FreeTDS mailing list
> > FreeTDS at lists.ibiblio.org
> > http://lists.ibiblio.org/mailman/listinfo/freetds
> > 
> 
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