PostgreSQL Refcursor || Cursors In PostgreSQL || Part 4 Refcursor Cursor...

In the fourth installment of our PostgreSQL Cursors series, we dive into the world of Refcursors, a powerful and flexible feature in PostgreSQL that allows for dynamic and complex data retrieval. Unlike regular cursors, Refcursors provide the ability to open a cursor in one function and fetch data from it in another, making them incredibly useful for modular and reusable database operations.

This tutorial begins with an introduction to Refcursors, explaining what they are and how they differ from other types of cursors available in PostgreSQL. We then move on to demonstrate how to declare, open, and use Refcursors within your database procedures, providing step-by-step instructions and practical examples to ensure you understand the concept thoroughly.

We also cover scenarios where Refcursors shine, such as when you need to return a cursor from a function to be used later or in different parts of your application. Additionally, we discuss best practices for using Refcursors efficiently, ensuring that your database operations remain performant and reliable.

Whether you’re managing complex queries or looking to build more modular database functions, this video will equip you with the knowledge needed to effectively utilize Refcursors in PostgreSQL.

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select refcursor_cursor(1,'lv_refcursor');

fetch all in lv_refcursor;

create or replace function refcursor_cursor(in_actor_id in integer, lv_ref_cur refcursor)

returns refcursor

language plpgsql

as $$

begin

open lv_ref_cur

for select 'Title: '||f.title as Title

from film_actor fa, film f

where fa.film_id = f.film_id

and fa.actor_id = in_actor_id;

return lv_ref_cur;

exception when others then

raise notice 'Something Went Wrong';

end;

$$