Hello 2011/5/19 Julius Tuskenis <julius@xxxxxxxx>: > Hello, > > I would like to ask if there is a possibility in postgresql (v9) to cycle > through the fields of some custom type parameter in plpgsql function. > > I have a type defined: > CREATE TYPE naims.frt_pwd_ed AS > Â (pwd_id integer, > Â Âpwd_sub_id integer, > Â Âpwd_login character varying(100)); > > In pseudocode thats what I'd like to achieve: > > function Changes(prm_old_pwd Ânaims.frt_pwd_ed, prm_new_pwd > naims.frt_pwd_ed) > returns set of text > begin > ÂFOR i = 0 to naims.frt_pwd_ed.FieldCount -1 LOOP > Â ÂIF prm_old_pwd.field(i).value <> prm_new_pwd.field(i).value THEN > Â Â ÂReturn Next prm_old_pwd.field(i).fieldname; > Â ÂEND IF; > ÂEND LOOP; > ÂReturn; > end; > > The functrion should check each field of 2 provided parameters and return > the fieldnames where the values are different. For this I need some tools to > extract field value and field name. Can this be done? > > Thank You in advance! > > -- It isn't possible directly you can a) use a PLPerl or a PLPython b) use some lib like pltoolbox http://www.pgsql.cz/index.php/PL_toolbox_%28en%29 c) use a EXECUTE USING trick http://okbob.blogspot.com/2008/06/execute-using-feature-in-postgresql-84.html d) use a hstore contrib module http://okbob.blogspot.com/2009/10/dynamic-access-to-record-fields-in.html Regards Pavel Stehule > Julius Tuskenis > Programavimo skyriaus vadovas > UAB nSoft > mob. +37068233050 > > > -- > Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
