On Nov 19, 2013, at 6:33 PM, Kevin Wooten <kd...@me.com> wrote: > My apologies for posting what is almost certainly somewhat of a repeat > question but I have searched and attempted everything I can think of and > cannot figure it out myself. > > The basic question is… Is it possible to get a scrollable cursor that, within > a transaction, can insert/update/delete rows and see those changes? > > Why you ask? Because I am implementing the JDBC 4.1 spec and it (optionally) > provides this ability and I’d like to provide it if possible. I thought just > using a scrollable cursor with the isolation-level set to repeatable-read > would do the trick but it still seems to see no changes > (inserts/updates/deletes). > > Effectively I want roughly this sequence of events to work. > > CREATE TABLE test (val text); > > BEGIN; # Could include ISOLATION LEVEL REPEATABLE READ > > DECLARE c1 CURSOR FOR SELECT * FROM test; > > FETCH ABSOLUTE 1; # Returns No Row > > INSERT INTO test VALUES (‘1'); > INSERT INTO test VALUES (‘2'); > INSERT INTO test VALUES (‘3'); > > FETCH ABSOLUTE 1; # Returns “1” > FETCH NEXT: # Returns “2" > DELETE FROM test WHERE CURRENT OF c1; # Deletes “2” > > FETCH ABSOLUTE 1; # Returns “1” > FETCH NEXT; # Returns “3” > UPDATE test SET val=‘4' WHERE CURRENT OF c1; > FETCH RELATIVE 0; # Returns “4” > > COMMIT; > > Thanks! > > -kw >
Should I take silence to mean this cannot be done? Or should I send to -hackers? -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
