oracle基础教程之触发器（DDL触发器作用）

栗子：

--案例1：禁止SCOTT用户的DDL操作
CREATE OR REPLACE TRIGGER scott_trigger
BEFORE DDL
ON SCHEMA
BEGIN
   RAISE_APPLICATION_ERROR(-20005,'scott用户禁止所有的DDL操作！');
END;

--测试
CREATE SEQUENCE test_seq;

--案例2：
--创建一个记录数据库对象DDL操作的日志表
create table object_log(
   logid number constraint pk_logid primary key,   
   operatedate date not null，
   objecttype varchar2(50) not null,
   objectowner varchar2(50) not null
);


CREATE SEQUENCE object_log_seq;

--创建触发实现对数据库对象DDL操作记录的触发器
CREATE OR REPLACE TRIGGER object_trigger
AFTER CREATE OR DROP OR ALTER
ON DATABASE
BEGIN
  INSERT INTO object_log(logid,operatedate,objecttype,objectowner)
  VALUES(object_log_seq.nextval,sysdate,ORA_DICT_OBJ_TYPE,ORA_DICT_OBJ_OWNER);
END;

--测试
conn yanln/yanln
create sequence test_seq1;

conn system/password
select * from object_log;