How To Create And Call A Stored Procedure With Multiple/Many OUT Paramet...

In this comprehensive tutorial, we explore the process of creating and calling stored procedures with multiple OUT parameters in PostgreSQL using PL/pgSQL. Handling multiple outputs from a single stored procedure can greatly enhance the efficiency and flexibility of your database operations.

We begin by showing you how to define a stored procedure with several OUT parameters, explaining the syntax and logic behind the PL/pgSQL code. This allows you to return multiple pieces of data from a single procedure call, which is especially useful for complex operations that involve multiple result sets or calculations.

Next, we demonstrate how to call the stored procedure and retrieve the multiple outputs effectively. Through detailed examples, you'll learn how to handle and use these outputs in your PostgreSQL environment, enabling you to perform more sophisticated database operations.

We also cover best practices for managing and optimizing stored procedures with multiple OUT parameters, including tips for maintaining performance and avoiding common pitfalls. This tutorial is perfect for database administrators, developers, and anyone looking to deepen their understanding of PostgreSQL's powerful features.

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CREATE OR REPLACE PROCEDURE public.two_out_param_proc(

IN in_customer_name character varying,

IN in_address_id numeric,

OUT out_payment_amount numeric,

OUT out_max_payment_date date

)

LANGUAGE 'plpgsql'

AS $BODY$

 

 Declare

 Begin

  Select sum(amount), max(payment_date) 

into out_payment_amount, out_max_payment_date

From payment

where customer_id = (select customer_id from customer

where first_name = in_customer_name

and address_id = in_address_id);

exception

when others then

raise notice 'Something went wrong';

end;

$BODY$;

ALTER PROCEDURE public.two_out_param_proc(character varying, numeric, numeric, date)

    OWNER TO postgres;

select sum(amount) from payment where customer_id = 341;

select * from customer where customer_id = 341;

do $$

declare

v_payment_amount numeric(10,2);

v_max_payment_date date;

begin

call two_out_param_proc('Peter',346,v_payment_amount,v_max_payment_date);

raise notice 'The total payment amount is % and the latest payment date is %',v_payment_amount,v_max_payment_date;

end $$;