create stored procedure in mysql with 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: mysql create stored procedure

-- MySQL

-- example
DELIMITER $$ -- Changes delimiter to $$ so can use ; within the procedure
CREATE PROCEDURE select_employees()
BEGIN
	select * 
	from employees 
	limit 1000; -- Use the ; symbol within the procedure
END$$ 
DELIMITER ; -- Resets the delimiter

/* syntax:
DELIMITER $$ -- Changes delimiter to $$ so can use ; within the procedure
CREATE PROCEDURE <Your-procedure-name>(<argument1><argument2>...<argumentN>)
BEGIN
	<Code-that-stored-procedure-executes>; -- Use the ; symbol within the procedure
END$$
DELIMITER ; -- Resets the delimiter
*/