convert TSQL query to MySQL - mysql

Question

I need to convert this tSQL query into MySQL query version 5.7.14
I tried declare parameter with the following syntax
declare #commissionType INT;
but I reached a dead end and need help to convert this query
CREATE PROCEDURE MyProc
#chainId int
as
BEGIN
declare #commissionMethod int
declare #commissionType int
declare #value decimal(18,2)
set #commissionMethod = 1
set #value = 200000
set #commissionType = (select CommissionType from CommissionRules
where ChainId = #chainId )
IF(#commissionMethod = 1)
BEGIN
print('alert')
select (Fixed * #value) / 100 from CommissionRules where ChainId = #chainId
END
END

Answer 1

This is pretty much a literal conversion. But check your logic. It doesn't make any sense. v_commissionMethod is always 1 and v_commissionType is not even being used after selecting a value.
DELIMITER //
CREATE PROCEDURE MyProc (
p_chainId int)
BEGIN
declare v_commissionMethod int;
declare v_commissionType int;
declare v_value decimal(18,2);
set v_commissionMethod = 1;
set v_value = 200000;
select CommissionType into v_commissionType from CommissionRules
where ChainId = p_chainId ;
IF(v_commissionMethod = 1)
THEN
/* print('alert') */
select (Fixed * v_value) / 100 from CommissionRules where ChainId = p_chainId;
END IF;
END;
//
DELIMITER ;

Answer 2

Something like this:
DELIMITER $$
CREATE PROCEDURE MyProc (
in_chainId unsigned
) as
BEGIN
select v_CommissionType := CommissionType,
v_commissionMethod = 1,
v_value = 200000
from CommissionRules
where ChainId = in_chainId;
if v_commissionMethod = 1 then
select 'alert';
select (Fixed * v_value) / 100
from CommissionRules
where ChainId = in_chainId
end if;
END;$$
DELIMITER ;