procedure mysql parameters 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: stored procedure with parameters mysql

-- Stored Procedure with parameters with default

DELIMITER $$

CREATE PROCEDURE get_clients_by_state
(
	state CHAR(2)
)
BEGIN
	IF state IS NULL THEN
    	SET state = 'CA';
    END IF;

	SELECT 
		*
	FROM
		clients c
    WHERE c.state =  state;
END $$

DELIMITER ;


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

CALL get_client_by_state(NULL);