请问如何用oracle触发器实现不允许新增/删除表/增加/减少/修改字段类型
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microsoft_fly 2008-11-18
还是用权限控制比较好，触发器影响数据库性能，越复杂对性能影响越大
fuxiaoyang13 2008-11-18
路过！
hongqi162 2008-11-17
楼主说的似乎不是处理表数据，而是处理建表，删除/修改表结构的操作,还是通过权限控制比较好
wfqqwer5213 2008-11-17
CREATE OR REPLACE TRIGGER ddl_trigger
BEFORE CREATE OR ALTER OR DROP
ON SCHEMA
DECLARE
oper ddl_log.operation%TYPE;
sql_text ora_name_list_t;
i PLS_INTEGER;
BEGIN
SELECT ora_sysevent
INTO oper
FROM dual;
i := sql_txt(sql_text);
IF oper IN ('CREATE', 'DROP') THEN
INSERT INTO ddl_log
SELECT ora_sysevent, ora_dict_obj_owner,
ora_dict_obj_name, sql_text(1), USER, SYSDATE
FROM dual;
ELSIF oper = 'ALTER' THEN
INSERT INTO ddl_log
SELECT ora_sysevent, ora_dict_obj_owner,
ora_dict_obj_name, sql_text(1), USER, SYSDATE
FROM sys.gv_$sqltext
WHERE UPPER(sql_text) LIKE 'ALTER%'
AND UPPER(sql_text) LIKE '%NEW_TABLE%';
END IF;
END ddl_trigger;
/
wfqqwer5213 2008-11-17
DDL Trigger - Triggering Operations
BEFORE / AFTER ALTER
BEFORE / AFTER ANALYZE
BEFORE / AFTER ASSOCIATE STATISTICS
BEFORE / AFTER AUDIT
BEFORE / AFTER COMMENT
BEFORE / AFTER CREATE
BEFORE / AFTER DDL
BEFORE / AFTER DISASSOCIATE STATISTICS
BEFORE / AFTER DROP
BEFORE / AFTER GRANT
BEFORE / AFTER NOAUDIT
BEFORE / AFTER RENAME
BEFORE / AFTER REVOKE
BEFORE / AFTER TRUNCATE
AFTER SUSPEND
范佩西_11 2008-11-17
这可以用权限控制吗。只给select权限就可以了
如果实在要用触发器，给你个限制增删改的例子：
-
create or replace trigger tr before insert or update or delete on act -
begin -
if updating or deleting or inserting -
then -
raise_application_error(-20001,'不允许增删改'); -
end if; -
end;
sleepzzzzz 2008-11-17
-
-- 试下 -
Create table test(a number); -
Create trigger tri_test -
Before insert or update or delete -
On foo -
Begin -
Raise_application_error(-20001, 'You don't have access to modify this table.'); -
End; -
/
sleepzzzzz 2008-11-17
好奇怪的需求
wfqqwer5213 2008-11-17
CREATE OR REPLACE TRIGGER trg_drop_table
BEFORE DROP ON DATABASE
BEGIN
raise_application_error(num => -20000,
msg => '主机:' ||
SYS_CONTEXT('USERENV', 'HOST') ||
chr(13) || 'IP:' ||
SYS_CONTEXT('USERENV', 'IP_ADDRESS') ||
'试图删除' || ora_dict_obj_name() || '表');
END;
一个禁止drop的例子
hongqi162 2008-11-17
用权限控制一下不就可以了么，这些操作和触发器没有什么关系
BlueskyWide 2008-11-17
回复
不允许新增/删除表
===============
界面层封住，Oracle用户名和密码不对外提供即可。
增加/减少/修改字段类型
====================
使用alter table add ...
alter table drop ...
修改字段可以使用先增加字段，然后删除来做。
如果Oracle用户名和密码别人知道了，只能通过职业道德来规范了。
Quote=引用楼主 anning241 的帖子:
急:
请问如何用oracle触发器实现不允许新增/删除表/增加/减少/修改字段类型
/Quote