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【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?

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【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。


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标签:DROP,TRUNCATE,185,DB,U2,LHR,SQL,TABLE
来源: https://blog.51cto.com/lhrbest/2703313