zhong ming wu wrote:
It seems that one cannot use the variable name that is the same as the column name of a relation like in the following function ------ create or replace function bla() returns void language plpgsql as $$ declare email varchar; begin select email into email from pass where id=1; raise notice 'pass is %',email; end; $$ ------ I get null value email and postgres 8.4.4 does not warn nor raise error on creating; I know for a fact that email must not be null; it's not null when I rename the variable email to something else.
All function lexical variables and parameters can be qualified with the function name, so you can say "bla.email" to refer to the variable unambiguously. And you can qualify a table column with the table name, like "pass.email" to make that unambiguous.
As far as I can see this isn't documented anywhere. Is this because it's common/insider knowledge? Can someone confirm?
It is documented, in http://www.postgresql.org/docs/8.4/interactive/plpgsql-structure.html but I do agree that it can be a challenge to find what section(s) of the manual has the information one seeks.
-- Darren Duncan -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
