在ORACLE用触发器实现主键功能时，出现再二次验证失败！想想问问这是怎么回事？？表的结构（id,topic,conten,author,auth_ip,pubdate,parentid）
create sequence forum_sequence
start with 1
ncrement by 1create or replace trigger forum_trigger
before insert on forum
referencing old as old new as new for each row
create sequence forum_sequence
start with 1
ncrement by 1create or replace trigger forum_trigger
before insert on forum
referencing old as old new as new for each row
为什么不通过forum_sequence.Nextval直接引用呢？