convert TSQL query to MySQL -


i need convert tsql query mysql query version 5.7.14 tried declare parameter following syntax

declare @commissiontype int;

but reached dead end , need convert query

create procedure myproc @chainid int  begin     declare @commissionmethod int     declare @commissiontype int     declare @value decimal(18,2)      set @commissionmethod = 1     set @value = 200000     set @commissiontype = (select  commissiontype commissionrules      chainid = @chainid )          if(@commissionmethod = 1)         begin             print('alert')             select (fixed * @value) / 100 commissionrules chainid = @chainid           end end

this pretty literal conversion. check logic. doesn't make sense. v_commissionmethod 1 , v_commissiontype not being used after selecting 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 v_commissiontype commissionrules          chainid = p_chainid ;              if(v_commissionmethod = 1)                             /* print('alert') */                 select (fixed * v_value) / 100 commissionrules chainid = p_chainid;               end if;     end;     //      delimiter ;

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