sql - Syntax error for MySQL function -

delimiter $$  create function ecmsbackoffice.getsequence($delimeter varchar(20)) returns varchar(20) begin declare result varchar(20); set result = 0;  if (delimeter='b') update id_generator set seq_currval=(seq_currval+1) seq_name='b'; else if (delimeter='d') update id_generator set seq_currval=(seq_currval+1) seq_name='d'; else if (delimeter='c') update id_generator set seq_currval=(seq_currval+1) seq_name='c'; end if  select seq_currval result  id_generator  seq_name = delimeter;  return result; end $$  delimiter ; 

i'm trying create mysql function, following error:

error code: 1064
have error in sql syntax; check manual corresponds mysql >server version right syntax use near 'select seq_currval result
id_generator
seq_name = delimeter;
r' @ line 9

what problem?

change else if elseif everywhere,