oracle 使用觸發器實現id自增

前提：存在數據庫di_test,主鍵為id。
1.創建一個索引sequence

create sequence di_test_id 
minvalue 1  
nomaxvalue  
start with 1  
increment by 1  
nocache; 

2.創建一個觸發器。在插入數據之前觸發
create or replace trigger trigger_di_test_insert  
  before insert on di_test    
  for each row    
declare  
  -- local variable here  
begin    
  -- Column "ID" uses sequence di_test_id  
  select di_test_id.nextval into :new.ID from dual;  
end trigger_di_test_insert;