SQL state: 42883 in PostgreSQL 9.3 - postgresql

Question

I have the following table called as test_type which contains two columns namely cola and colb.
Table: test_type
create table test_type
(
cola int,
colb varchar(50)
);
Now I want to create a type with same columns.
Type: type1
create type type1 as
(
cola int,
colb varchar(50)
);
Here I have created function in which I am passing type name type1 to insert the data to the
table test_type.
--Creating Function
create or replace function fun_test ( p_Type type1 )
returns void
as
$$
begin
insert into test_type(cola,colb)
select cola,colb from p_type
EXCEPT
select cola,colb from test_type;
end
$$
language plpgsql;
---Calling Function
SELECT fun_test(1,'Xyz');
Error Details:
ERROR: function fun_test(integer, unknown) does not exist
SQL state: 42883
Hint: No function matches the given name and argument types. You might need to add explicit type casts.
Character: 8

Answer 1

You need to "pack" the arguments together: (1,'xs'), so that postgres recognise them as single argument of type type1:
SELECT fun_test((1,'xs'));
For a better readability you can cast the argument to type1 (not really necessary):
SELECT fun_test((1,'xs')::type1);
If the purpose of the function is to to insert the values only if they are not already contained in the table, you could change your code so:
create or replace function fun_test ( p_Type type1 )
returns void AS $$
BEGIN
INSERT INTO test_type(cola,colb)
SELECT p_Type.cola,p_Type.colb
EXCEPT
SELECT cola,colb FROM test_type;
END;
$$ language plpgsql;
But this syntax is my opinion not good readable. This statement looks better:
...
BEGIN
PERFORM 0 FROM test_type WHERE (cola, colb) = p_Type;
IF NOT FOUND THEN
INSERT INTO test_type(cola,colb) VALUES (p_Type.cola,p_Type.colb);
END IF;
END;
...