Cstring vs. Datum values ( BuildTupleFromCStrings vs. BlessTupleDesc)
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From: Greg Stark on 23 Jan 2010 10:54 On Sat, Jan 23, 2010 at 12:56 PM, Ivan Sergio Borgonovo <mail(a)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. -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers(a)postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
From: Greg Stark on 23 Jan 2010 13:08
On Sat, Jan 23, 2010 at 5:53 PM, Ivan Sergio Borgonovo <mail(a)webthatworks.it> wrote: > That confused me further since it seems a 3rd technique to return > set of records. > The heapfuncs.c example uses get_call_result_type() to get the tupledesc and calls heap_form_tuple() to construct the return value, just like the docs describe. The extra code is because it's a set-returning-function which has its own set of tricky things to do. -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers(a)postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers |