mysql - What is wrong with the syntax in this stored procedure? -

delimiter;; create procedure rowperrow() begin declare n int default 0; declare int default 0; declare j int default 0; select count(*) jos_downloads_files n; set j=0; set i=0; while i<n  insert jos_downloads_files_temp(id,filetitle,filetype)  select distinct t.id, t.filetitle, t.filetype jos_downloads_files t left join jos_downloads_files t2 on t.filetitle != t2.filetitle t.filetitle concat('%', t2.filetitle, '%') , t.filetype 'pdf' union  select distinct t2.id, t2.filetitle, t2.filetype jos_downloads_files t left join jos_downloads_files t2 on t.filetitle != t2.filetitle t.filetitle concat('%', t2.filetitle, '%') , t.filetype 'pdf' order filetitle, filetype limit j,2;  set @myvar := (select filetitle jos_downloads_files_temp filetype 'pdf');  set @dwg := (select id jos_downloads_files_temp filetype 'dwg');  update jos_downloads_files set filetitle = @myvar filetype 'dwg' , id=@dwg , filetitle!=@myvar;  truncate table jos_downloads_files_temp;  set = + 1; set j = j + 2;  end while; end; ;; 

results in this:

error

sql query:

create procedure rowperrow() begin declare n int default 0; 

mysql said: documentation

1064 - have error in sql syntax; check manual corresponds mariadb server version right syntax use near '' @ line 3