On 15/03/12 12:35, Tim Bunce wrote:
There's actually an (almost completely undocumented) more_results()
method that's meant for that kind of thing. I was rather surprised
to find it wasn't documented as I'm pretty sure we thrashed out the
semantics some time ago.
[later] Wow, "some time ago" was 2004 :)
See
http://markmail.org/thread/i7drouwtpdiybjzn#query:+page:1+mid:p4dy4uv3t2kpku56+state:results
The "example implementation" in there assumed $sth->prepare works.
Given current realities the more_results method would be like:
$sth = $sth->{Database}->prepare($sql);
$sth->execute;
return $sth; # caller must use this returned handle
That thread was actually a lot longer than markmail shows:
http://www.nntp.perl.org/group/perl.dbi.dev/2004/02/msg3062.html
http://www.nntp.perl.org/group/perl.dbi.dev/2004/03/msg3221.html
Various drivers now have their own implementation:
syb_more_results:
http://search.cpan.org/~mewp/DBD-Sybase-1.14/Sybase.pm#Handling_Multiple_Result_Sets
odbc_more_results:
http://search.cpan.org/~mjevans/DBD-ODBC-1.35/ODBC.pm#odbc_more_results
sqlite_allow_multiple_statements:
http://search.cpan.org/~adamk/DBD-SQLite-1.35/lib/DBD/SQLite.pm#Processing_Multiple_Statements_At_A_Time
more_results:
http://search.cpan.org/~capttofu/DBD-mysql-4.020/lib/DBD/mysql.pm#MULTIPLE_RESULT_SETS
teradata also has tdat_more_results
There are probably more, these are just the ones I've used.
My recollection is that the discussion found that handling multiple result sets
was more complicated than some people first thought and I guess that is why it
never really came to fruition. In particular:
http://www.nntp.perl.org/group/perl.dbi.dev/2004/03/msg3243.html
Martin
--
Martin J. Evans
Easysoft Limited
http://www.easysoft.com
