stored procedure parameter modes in mysql code example

Example 1: stored procedure with parameters mysql

-- Stored Procedure with parameters with default
-- this examble return all clients in all states if parameter is NULL

DELIMITER $$

CREATE PROCEDURE get_clients_by_state
(
	state CHAR(2)
)
BEGIN
	SELECT 
		*
	FROM
		clients c
    WHERE c.state =  IFNULL(state, c.state);
END $$

DELIMITER ;


-- Once you save the stored procedure, you can invoke it by using the CALL statement:

CALL get_client_by_state(NULL);

Example 2: mysql stored procedure parameters

DELIMITER //

CREATE PROCEDURE GetOfficeByCountry(
	IN countryName VARCHAR(255)
)
BEGIN
	SELECT * 
 	FROM offices
	WHERE country = countryName;
END //

DELIMITER ;Code language: SQL (Structured Query Language) (sql)