On Thu, Mar 26, 2009 at 12:12, David Schmidt <[email protected]> wrote: > On Thu, Mar 26, 2009 at 3:56 PM, Rob Kinyon <[email protected]> wrote: >> On Thu, Mar 26, 2009 at 10:48, David Schmidt <[email protected]> wrote: >>> Hello everyone, >>> >>> Is there any way (without transactions or 2 DB trips) to achieve the >>> following: >>> >>> Insert a row and use the autoincremented primary key value in another >>> column. >>> >>> table: pictures >>> id integer primary key, >>> filename varchar2(128) >>> >>> my $picture = $c->model('myDB::Pictures')->new_result({ >>> filename => <ID> . '_' . $filename >>> }); >> >> If you weren't using DBIC, how would you solve this? >> >> -- >> Thanks, >> Rob Kinyon >> >> _______________________________________________ >> List: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/dbix-class >> IRC: irc.perl.org#dbix-class >> SVN: http://dev.catalyst.perl.org/repos/bast/DBIx-Class/ >> Searchable Archive: >> http://www.grokbase.com/group/[email protected] >> > > Hey Rob, > > Well, I dont want to use a RDBMS specific solution using triggers. > > What I'd like to do would be to instruct DBIC to concatenate the value > I supply for the column with the autoincremented integer upon insert. > For Oracle I'd probably write somehing like "INSERT INTO pictures > (filename) VALUES (SEQUENCE.NEXT . 'my_filename')" (untested and not > sure about the correct syntax here but I hope I made myself clear) > > But I really want to do this on the DBIC side so i can switch DB later.
The only way to do it on the client-side (which is where DBIC sits) is to do the insert, then update the row immediately once we know what the value for the PK will be. So, you'd write a post-insert trigger. Ideally, you would do this within txn_do(), but that's just my paranoia. -- Thanks, Rob Kinyon _______________________________________________ List: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/dbix-class IRC: irc.perl.org#dbix-class SVN: http://dev.catalyst.perl.org/repos/bast/DBIx-Class/ Searchable Archive: http://www.grokbase.com/group/[email protected]
