How to write function in postgresql?

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Hi All,

I want to know how to write function using output parameter in postgresql.

this is my table actor structure with data and datatype.
actorid|fistname |lastname| last_update|
integer|character|character|timestamp|
1;"Penelope";"Guiness";"2013-05-26 14:47:57.62"
2;"Nick";"Wahlberg";"2013-05-26 14:47:57.62"

What I have tried:

I have written one function to get result set from the query using out keyword in function.

create or replace function view_setactor(id int,out first_name TEXT,lastname TEXT)
returns setof record
as
$$
select * from actor where actor_id=$1;
$$
language 'sql' STABLE;

but iam getting error..

ERROR: function result type must be text because of OUT parameters
********** Error **********

ERROR: function result type must be text because of OUT parameters
SQL state: 42P13

what is this pleas help me on this..any solution would be greatly appreciated.

Posted 20-Jun-16 0:27am

Member 11337367

Updated 20-Jun-16 0:37am

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Kornfeld Eliyahu Peter · Answer 1 · 2016-06-20T00:37:00

Solution 1

When you have out parameters, your SELECT statement have to select the number and type fitting the parameter list...
In your case you have to do something like this:

SQL

select first_name, lastname from actor where actor_id=$1;

Posted 20-Jun-16 0:37am

Kornfeld Eliyahu Peter

Comments

Member 11337367 20-Jun-16 7:23am

Can you tell me what is the difference between using volatile and stable .

Kornfeld Eliyahu Peter 20-Jun-16 7:27am

Read here: https://www.postgresql.org/docs/current/static/xfunc-volatility.html