通过trigger禁止用户删除或修改等DDL操作

有时，为了防止意外删除数据库中的表或者其他数据库对象，可以通过人为的增加一个trigger来实现。如下：

create or replace trigger ddl_deny
before create or alter or drop or truncate on database
declare
  l_errmsg varchar2(100):= ‘You have no permission to this operation’;
begin
  if ora_sysevent = ‘CREATE’ then
     raise_application_error(-20001, ora_dict_obj_owner || ‘.’ || ora_dict_obj_name || ‘ ‘ || l_errmsg);
  elsif ora_sysevent = ‘ALTER’ then
    raise_application_error(-20001, ora_dict_obj_owner || ‘.’ || ora_dict_obj_name || ‘ ‘ || l_errmsg);
  elsif ora_sysevent = ‘DROP’ then
    raise_application_error(-20001, ora_dict_obj_owner || ‘.’ || ora_dict_obj_name || ‘ ‘ || l_errmsg);
  elsif ora_sysevent = ‘TRUNCATE’ then
    raise_application_error(-20001, ora_dict_obj_owner || ‘.’ || ora_dict_obj_name || ‘ ‘ || l_errmsg);
  end if;
exception
  when no_data_found then
    null;
end;
/

最好用sysdba登录执行，然后使用一个业务用户登录测试drop；

SQL> drop table test;

drop table a

ORA-00604: 递归 SQL 级别 1 出现错误
ORA-20001: TEST.TEST You have no permission to this operation
ORA-06512: 在 line 9

这里是参考一位大师的解决思路，类似需求可以参考这个加以修改。