On Sat, 23 Jan 2010 15:54:04 +0000 Greg Stark <gsst...@mit.edu> wrote:
> On Sat, Jan 23, 2010 at 12:56 PM, Ivan Sergio Borgonovo > <m...@webthatworks.it> wrote: > > And if I can... how, why and when... because I didn't find any > > clear example in the source tree that gives me a clue about when > > I'd use one form or the other. > > > > There are a few contrib modules which make good examples, you could > look at contrib/pageinspect/heapfuncs.c:heap_page_items() for > example. That confused me further since it seems a 3rd technique to return set of records. One way is given for example in: ./src/backend/utils/adt/tsvector_op.c that uses BlessTupleDesc another that seems to be more frequent is given in the docs: http://www.postgresql.org/docs/8.4/static/xfunc-c.html#AEN44970 and finally the one you gave as an example I can't understand when each one should be used and I can't understand why so many ways to return a tuple... not to mention I've to "reverse engineer" many of the parameters of the function involved. Could someone give me a clue about when it is more suitable to use all the above techniques? thanks -- Ivan Sergio Borgonovo http://www.webthatworks.it -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
