I need some help writing a simple function.
Due to some program limitations for a program I run the db's for, I'm having
to write some simple functions to run some selects. However, I am not sure
how to have them correctly return the record(s) selected and/or how to
properly call them from sql.
Would someone be so kind as to help me with this.
Here is an example function:
CREATE OR REPLACE FUNCTION "public"."test_func" (varchar) RETURNS SETOF
"public"."test_tbl" AS'
Declare PCN varchar; test_tbl_rec clmhdr%ROWTYPE;
Begin
PCN := $1;
select into test_tbl_rec * from test_tbl where test_tbl.pcn = PCN;
return test_tbl_rec;
end;
'LANGUAGE 'plpgsql' VOLATILE RETURNS NULL ON NULL INPUT SECURITY INVOKER;
I was trying to call this function from psql using:
select test_func('asdf');
Which returned:
ERROR: Set-valued function called in context that cannot accept a set
WARNING: Error occurred while executing PL/pgSQL function test_func
WARNING: while casting return value to function's return type
What am I doing wrong? I'm in fairly new territory with this type of
functions. I normally have just written simple trigger function that log
table changes.
Thanks for any and all help.
Chris
P.S.
Is there a good website and/or book for learning the intricacies of pgsql?
