oracle把varchar2修改为clob

delete　from fab_policy_his;
commit;
alter table fab_policy_his modify (fabstract long);
alter table fab_policy_his modify (fabstract clob);


delete　from fab_policy;
commit;
alter table fab_policy modify (fabstract long);
alter table fab_policy modify (fabstract clob);


delete from afa_notice;
commit;
alter table afa_notice modify (fcontent long);
alter table afa_notice modify (fcontent clob);