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;

$$

PostgreSQL Cursors || Cursors Available In PostgreSQL || Part 3 For Loop...

In the third part of our PostgreSQL Cursors series, we focus on For Loop Cursors, a powerful feature that allows you to iterate over the rows of a result set one by one. This technique is particularly useful when you need to perform operations on each row returned by a query, such as updating records, calculating values, or logging data.

We begin by explaining the concept of cursors in a For Loop and how they differ from other types of cursors. You’ll learn how to declare and use a For Loop Cursor in PostgreSQL, with step-by-step instructions and clear examples that demonstrate its practical applications. We also discuss common scenarios where For Loop Cursors are most effective, such as batch processing and automated data handling tasks.

The video also covers best practices for using For Loop Cursors efficiently, including tips on optimizing performance and managing resources within your PostgreSQL environment. By the end of this tutorial, you will have a thorough understanding of how to leverage For Loop Cursors to automate and enhance your database operations.

Whether you're new to PostgreSQL or looking to expand your expertise, this tutorial provides valuable insights into the effective use of cursors in a loop for database programming.

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call for_loop_cursor(1);

create or replace procedure for_loop_cursor(in_actor_id in integer)

language plpgsql

as $$

declare

lv_string character varying(200);

loop_rec record;

begin

for loop_rec in 

select f.title from film_actor fa,film f 

where fa.film_id = f.film_id 

and actor_id = in_actor_id

LOOP

lv_string := 'Title: '||loop_rec.title;

raise notice '%',lv_string;

end loop;

exception when others then

raise notice 'Something Went Wrong';

end;

$$

PostgreSQL Cursors || Cursors Available In PostgreSQL || Part 2 Paramete...

In Part 2 of our PostgreSQL Cursors series, we focus on Parameterized Cursors, an advanced type of cursor that allows for dynamic data retrieval based on parameters passed at runtime. Parameterized cursors are incredibly useful when you need to execute the same query with different values, making your database operations more flexible and efficient.

The tutorial begins with a brief overview of what parameterized cursors are and how they differ from simple cursors. You’ll learn how to define a parameterized cursor in PostgreSQL, set the necessary parameters, and use these cursors to fetch data dynamically. The video includes detailed, step-by-step examples that illustrate how to use parameterized cursors in various scenarios, such as filtering data or performing operations on subsets of data based on different criteria.

We also cover the best practices for managing parameterized cursors, ensuring that your queries run efficiently without putting undue strain on your database resources. By the end of this video, you will have a solid understanding of how to implement and optimize parameterized cursors in your PostgreSQL environment, helping you to build more dynamic and responsive database applications.

Whether you're a database administrator, developer, or just looking to deepen your PostgreSQL knowledge, this tutorial provides the insights and techniques you need to effectively use parameterized cursors.

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call parameterized_cursor(1);

create or replace procedure parameterized_cursor(in_actor_id in integer)

language plpgsql

as $$

declare

lv_string character varying(200);

loop_rec record;

rec1 record;

cur1 cursor(p_film_id integer) for 

select title from film where film_id = p_film_id order by film_id;

begin

for loop_rec in select film_id from film_actor where actor_id = in_actor_id

LOOP

open cur1(loop_rec.film_id);

loop 

fetch cur1 into rec1;

exit when not found;

lv_string := 'Title: '||rec1.title;

raise notice '%',lv_string;

end loop;

close cur1;

end loop;

exception when others then

raise notice 'Something Went Wrong';

end;

$$

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PostgreSQL Cursors || Cursors Available In PostgreSQL || Part 1 Simple C...

In this video, we introduce you to PostgreSQL Cursors, focusing on simple cursors as the first part of our series on cursors available in PostgreSQL. Cursors are an essential tool for managing large result sets, allowing you to retrieve and process data in smaller, more manageable chunks rather than all at once.

We start by explaining what a cursor is and how it works in PostgreSQL. You'll learn the scenarios where cursors are particularly useful, such as when working with large datasets or when you need to process query results row by row. The video then guides you through the steps to create and use a simple cursor, with clear and concise examples to help you understand how to implement this in your own database projects.

Additionally, we discuss best practices for using cursors effectively, ensuring that you can handle large amounts of data without overloading your system or causing performance issues. By the end of this tutorial, you'll have a solid understanding of how to leverage simple cursors in PostgreSQL, setting the foundation for more advanced cursor techniques in upcoming videos.

Whether you’re a beginner or looking to expand your PostgreSQL skills, this video is a great resource for understanding and utilizing cursors in your database operations.

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call simple_cursor();

create or replace procedure simple_cursor()

language plpgsql

as $$

declare

lv_string character varying(200);

rec1 record;

cur1 cursor for 

select actor_id, first_name, last_name as end_name from actor order by actor_id;

begin

open cur1;

loop 

fetch cur1 into rec1;

exit when not found;

lv_string := 'Actor ID: '||rec1.actor_id||', Actor First Name: '||rec1.first_name||', Actor Last Name: '||rec1.end_name;

raise notice '%',lv_string;

end loop;

close cur1;

exception when others then

raise notice 'Something Went Wrong';

end;

$$

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