create table AppInfo
(
    fid         number primary key,fappID         VARCHAR2(32)         not null,fappSecret   VARCHAR2(32)         not null  
);

2.创建自增序列

CREATE SEQUENCE voucherdb_sequence
INCREMENT BY 1 -- 每次加几个
START WITH 1 -- 从1开始计数
NOMAXVALUE -- 不设置最大值
NOCYCLE -- 一直累加，不循环
NOCACHE -- 不建缓冲区

create trigger AppInfo_trig before
insert on AppInfo for each row when (new.fid is null)
begin
 select voucherdb_sequence.nextval into:new.fid from dual;
 end;