给oracle表格添加主键

 

注意：

PLM_SPAREPARTS_DESDOC_RELATION为数据库表名

TASKID 为新加的一个字段

SEQ_PLM_SPA_DES_RELA_TASKID 为序列名

TRG_PLM_SPA_DESDOC_RELATION为触发器名

--第0步
alter table PLM_SPAREPARTS_DESDOC_RELATION add TASKID number

--第1步
create sequence SEQ_PLM_SPA_DES_RELA_TASKID INCREMENT BY 1 START WITH 1 NOMAXVALUE NOCYCLE


--第2步
create or replace trigger TRG_PLM_SPA_DESDOC_RELATION
  before insert
  on PLM_SPAREPARTS_DESDOC_RELATION
  for each row
declare

 nextid number;
begin
  IF :new.TASKID IS NULL then
      select SEQ_PLM_SPA_DES_RELA_TASKID.NEXTVAL
      into nextid  from dual;
      :new.TASKID:=nextid;
  end IF;


end TRG_PLM_SPA_DESDOC_RELATION;

--第3步
update PLM_SPAREPARTS_DESDOC_RELATION set PLM_SPAREPARTS_DESDOC_RELATION.TASKID = SEQ_PLM_SPA_DES_RELA_TASKID.nextval;