Oracle 使用触发器实现主键自动增长

create table tb_vegetablesType(--存放菜品类型
  id number primary key,--主键
  typename varchar2(20) not null --类型名
);

 

create sequence seq_vegetablesType
increment by 1
start with 1
maxvalue 999999
nocycle;

 

 

--使用触发器实现自动编号
create or replace trigger tr_insertDept
  before insert on tb_vegetablestype 
  for each row

begin
  select seq_vegetablesType.Nextval into :new.id from dual;
end tr_insertDept;

 

insert into tb_vegetablesType(typename) values('素菜');
insert into tb_vegetablesType(typename) values('荤菜');
insert into tb_vegetablesType(typename) values('凉菜');

 

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