一：建立sequence
-- Create sequence create sequence SEQ_PUSH minvalue 1 maxvalue 9999999999 start with 1 increment by 1 cache 20;
二：建立Trigger
在向t_push表中插入一条数据时，ID自动赋值
create or replace trigger tr_id_insert before insert on t_push for each row declare -- local variables here begin select seq_user_id.nextval into :new.id from dual; end tr_id_insert;
原文：http://www.cnblogs.com/yshyee/p/3514611.html