【DB笔试面试185】在Oracle中，如何让普通用户可以TRUNCATE其他用户的表？
在Oracle中，
如何让普通用户可以TRUNCATE其他用户的表
？
用户1若要删除用户2的索引，则用户1需要有DROP ANY INDEX的权限。用户1若要TRUNCATE用户2的表，则用户1需要有DROP ANY TABLE的权限。但是，DROP ANY INDEX和DROP ANY TABLE的权限过大，一般不能赋予普通用户这2个权限，那么可以通过写存储过程来实现该功能，如下所示：
CREATE OR REPLACE PROCEDURE PRO_TRUNC_DROP_LHR(COMMAND IN VARCHAR2,
O_TYPE IN VARCHAR2,
OWNER IN VARCHAR2,
O_NAME IN VARCHAR2) AUTHID DEFINER AS
V_SQL VARCHAR2(4000);
BEGIN
IF UPPER(COMMAND) IN ('DROP', 'TRUNCATE') AND
UPPER(O_TYPE) IN ('TABLE', 'INDEX') THEN
V_SQL := COMMAND || ' ' || O_TYPE || ' ' || OWNER || '.' || O_NAME;
EXECUTE IMMEDIATE V_SQL;
END IF;
END PRO_TRUNC_DROP_LHR;
使用示例如下所示：
创建用户1和用户2，分别赋予CONNECT和RESOURCE权限：
SQL> SHOW USER
USER is "SYS"
SQL>
SQL> CREATE USER LHR_U1 IDENTIFIED BY LHR_U1;
User created.
SQL> CREATE USER LHR_U2 IDENTIFIED BY LHR_U2;
User created.
SQL> GRANT CONNECT,RESOURCE TO LHR_U1;
Grant succeeded.
SQL> GRANT CONNECT,RESOURCE TO LHR_U2;
Grant succeeded.
用户2创建表U2_T_LHR：
SQL> CONN LHR_U2/LHR_U2
Connected.
SQL> CREATE TABLE U2_T_LHR AS SELECT * FROM DUAL;
Table created.
SQL> SELECT * FROM U2_T_LHR;
D
-
X
SQL> CREATE INDEX IDX_U2_T_LHR ON U2_T_LHR(DUMMY);
Index created.
SQL>
SQL> GRANT SELECT,DELETE,UPDATE ON U2_T_LHR TO LHR_U1;
Grant succeeded.
用户2创建存储过程并赋予用户1的执行权限：
SQL> CREATE OR REPLACE PROCEDURE PRO_TRUNC_DROP_LHR(COMMAND IN VARCHAR2,
2 O_TYPE IN VARCHAR2,
3 OWNER IN VARCHAR2,
4 O_NAME IN VARCHAR2) AUTHID DEFINER AS
5 V_SQL VARCHAR2(4000);
6 BEGIN
7 IF UPPER(COMMAND) IN ('DROP', 'TRUNCATE') AND
8 UPPER(O_TYPE) IN ('TABLE', 'INDEX') THEN
9 V_SQL := COMMAND || ' ' || O_TYPE || ' ' || OWNER || '.' || O_NAME;
10 EXECUTE IMMEDIATE V_SQL;
11 END IF;
12 END PRO_TRUNC_DROP_LHR;
13 /
Procedure created.
SQL> GRANT EXECUTE ON PRO_TRUNC_DROP_LHR TO LHR_U1;
Grant succeeded.
用户1开始查询：
SQL> conn LHR_U1/LHR_U1
Connected.
SQL>
SQL> SELECT * FROM LHR_U2.U2_T_LHR;
D
-
X
SQL> TRUNCATE TABLE LHR_U2.U2_T_LHR;
TRUNCATE TABLE LHR_U2.U2_T_LHR
*
ERROR at line 1:
ORA-01031: insufficient privileges
SQL> DROP INDEX LHR_U2.IDX_U2_T_LHR;
DROP INDEX LHR_U2.IDX_U2_T_LHR
*
ERROR at line 1:
ORA-01418: specified index does not exist
SQL> DROP TABLE LHR_U2.U2_T_LHR;
DROP TABLE LHR_U2.U2_T_LHR
*
ERROR at line 1:
ORA-01031: insufficient privileges
可以看到TRUNCATE、DROP都没有权限，下面采用存储过程删除：
SQL> EXEC LHR_U2.PRO_TRUNC_DROP_LHR('TRUNCATE','TABLE','LHR_U2','U2_T_LHR');
PL/SQL procedure successfully completed.
SQL> SELECT * FROM LHR_U2.U2_T_LHR;
no rows selected
SQL> EXEC LHR_U2.PRO_TRUNC_DROP_LHR('DROP','INDEX','LHR_U2','IDX_U2_T_LHR');
PL/SQL procedure successfully completed.
SQL> EXEC LHR_U2.PRO_TRUNC_DROP_LHR('DROP','TABLE','LHR_U2','U2_T_LHR');
PL/SQL procedure successfully completed.
SQL> SELECT * FROM LHR_U2.U2_T_LHR;
SELECT * FROM LHR_U2.U2_T_LHR
*
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> CONN LHR_U2/LHR_U2
Connected.
SQL>
SQL> SELECT * FROM USER_INDEXES;
no rows selected
可以看到已经正常删除了。