create function ts_fmt(TS timestamp, fmt varchar(20))
returns varchar(50)
return
with tmp (dd,mm,yyyy,hh,mi,ss,nnnnnn) as
(
select
substr( digits (day(TS)),9),
substr( digits (month(TS)),9) ,
rtrim(char(year(TS))) ,
substr( digits (hour(TS)),9),
substr( digits (minute(TS)),9),
substr( digits (second(TS)),9),
rtrim(char(microsecond(TS)))
from sysibm.sysdummy1
)
select
case fmt
when 'yyyymmdd'
then yyyy || mm || dd
when 'mm/dd/yyyy'
then mm || '/' || dd || '/' || yyyy
when 'yyyy/dd/mm hh:mi:ss'
then yyyy || '/' || mm || '/' || dd || ' ' ||
hh || ':' || mi || ':' || ss
when 'nnnnnn'
then nnnnnn
else
'date format ' || coalesce(fmt,'
') ||
' not recognized.'
end
from tmp
使用例句：
update t_attachment as a set a.attach_path=(select '/'||rtrim(char(apply_com_id))||'/'||rtrim(char(ts_fmt(apply_date,'yyyymmdd')))||'/' from t_rmbs_claim as c
where a.claim_id=c.claim_id)||rtrim(a.attach_path) where exists (select 1 from t_rmbs_claim as tc where tc.claim_id=a.claim_id);