mysql - using the condition if in a function -


i created function using "if..else if", in order cover field , extract characters , store them in column:

delimiter | create function mettre (s varchar(2000)) returns varchar(10000) deterministic    begin             declare str  varchar(2000);            declare str1  varchar(2000);             declare str2  varchar(2000);             declare str3  varchar(2000);            declare tofind  varchar(2000);            declare co varchar(2000);            set co='';            set str='';            set str1='';            set str2=''; set str1 =substring(trim(substring_index(s,'du',-1)),1,3);  set str2 =substring(trim(substring_index(s,':',-1)),1,3);  set str =substring(trim(substring_index(s,'sur',-1)),1,3); if  (str in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab')) =1 set co = str ; else if ((str not in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab')) , (str1 in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab')))=1 set co = str1 ; else if ((str1 not in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab'))and (str2 in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab')))=1 set co = str2 ; else set co = '1' ;   end if; end if; end if;              return co;    end | delimiter;

but it's not working first condition used. 

if  (str in ('zag','tun','toz','tat','sos','sil','sfx','sbo','rnc','bar','bej','biz','bsc','gab','gaf','jen','kai','kas','keb','kef','mah','med','mon','nab')) =1 set co = str ;


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