At the moment I am using tcl to experiment, but the problem is apparent even in the psql interpreter.
The problem is that the value returned from the function below lumps all of the attribute values together
in each row as opposed to keeping them separate. So instead of seeing three distinct attributes on each tuple,
I am just getting a single concatenated string with no attributes.
The example is below, and my question is: What is the proper way to return multiple tuples from a function so that
the attribute values are properly separated (available for use by an external program such as java/python/tcl)?
Help greatly appreciated! - Leon
Example follows:
I've got a table named contracts with three attributes: number integer, org_code text, type text
Here's the function in question:
create or replace function getContracts() returns setof contract as
$$
declare
r contract%rowtype;
begin
for r in select * from contract
loop
return next r;
end loop;
return;
end
$$
language plpgsql;
Here is the contrasting output seen in the psql interpreter:
===
GOOD ( attributes separated)
contracts=# select * from contract;
number | org_code | type
--------+----------+-------
1 | USGE | Renew
2 | USGE | Renew
3 | USGE | Renew
and via tcl - also good:
% set result [pg_exec $db "select * from contract"]
pgsql6.0
% pg_result $result -numTuples
3
% pg_result $result -numAttrs
3
===
BAD (attributes concatenated) why?
contracts=# select getContracts();
getcontracts
-----------------
(1,USGE,Renew)
(2,USGE,Renew)
(3,USGE,Renew)
and via tcl - not what I wanted:
% set result2 [pg_exec $db "select getContracts()"]
pgsql6.1
% pg_result $result2 -numTuples
3
% pg_result $result2 -numAttrs
1
