Working with user defined variables in mysql - mysql

Question

I have below set statements for MSSQL, which works perfect :
Declare #uid INT;
Declare #ct int;
Declare #code int;
Declare #usertype int;
Declare #flag char;
Declare #max_itemid int;
Declare #ulname varchar(10);
Declare #ufname varchar(10);
set #code= 123;
set #ulname='Will';
set #ufname='Smith';
set #max_itemid=(select max(itemid) from registration;
set #uid = (select uid from users where ulname=#ulname and ufname=#ufname)
set #ct=(select count(*) from usercodes where itemId=#uid)
set #usertype=(select usertype from users where uid=#uid)
If(#usertype=1)
begin
If (#uid>0)
Begin
select * from users where uid=#uid;
select * from usercodes where itemId=#uid;
if(#ct=0)
begin
if (#max_itemid=2 or #max_itemid=0)
set #flag='D';
else
set #flag='O';
insert into usercodes (itemId,CODE,Flag) values(#uid,#code,#flag);
select * from usercodes where itemId=#uid;
else
begin
PRINT 'UserCode is already added and below is result:';
select * from usercodes where itemId=#uid;
end
end
Else
PRINT 'No User Found';
end
else
begin
print 'User not added as usertype is ';PRINT #usertype;
end
Now i am a newbee to Mysql and want to rewrite the above statements as per the Mysql conventions. I figured out the syntax, and changes the declarations as :
SET #CODE='S10_12345' ;
SET #NAME='Will Smith';
and so on.
But the executions stops once it enters the IF statement. Can someone help figuring out where I am wrong ?
P.S. I am not using any procedures/functions - i can't store these bunch of statements as I have to customize the select statements as the DB can change each time.