實際應用中，會遇到在某個用戶下需要查詢另一個用戶下的表數據或視圖的情況，然而在沒有授權時，會提示無權限操作的錯誤。那就需要通過授權處理后，再能進行查詢操作，下面我們來看看是怎么處理的。

一、系統權限說明：

1、用戶權限

CREATE SESSIOIN 連接到數據庫

CREATE TABLE? ? 在用戶的方案中創建表

CREATE SEQUENCE 在用戶的方案中創建序列

CREATE VIEW? ? ?在用戶的方案中創視圖

CREATE PROCEDURE在用戶的方案中創建存儲過程，函數或包

1.1、例子：授予系統權限

DBA能夠授予用戶指定的系統權限

GRANT create session,create table,

? ? ? ?create sequence,create view

?TO scott;

二、創建用戶只用于查詢其它用戶庫的表和視圖

1、創建用戶

create?user?用戶名?identified?by?密碼; grant?connect，select?any?table?to?用戶名; 這樣創建的用戶就可以連接數據庫和只有對任何表有查詢權限了grant?connect?to?用戶名??//只有連接權限

2、授權查詢表與視圖權限

2.1、a用戶下授權查詢所有表給b用戶（a用戶登錄執行下面語句）

select?'grant?select?on?a.'?||?tname?||?'?to?b;'?from?tab; 'GRANTSELECTONA.'||TNAME||'TOB;' ------------------------------------------------------ grant?select?on?a.VOTE_NUM?to?b; grant?select?on?a.TMP_MSG?to?b; grant?select?on?a.VOTE_IP?to?b; grant?select?on?a.QUESTION?to?b; grant?select?on?a.QUESTION_COUNT?to?b; grant?select?on?a.RECORD_DICT?to?b; grant?select?on?a.BM_COLUMN?to?b; grant?select?on?a.BM_COLUMN_CLASSIFY_REL?to?b; grant?select?on?a.BM_INFO_CLASSIFY?to?b; grant?select?on?a.BM_MODULE?to?b; grant?select?on?a.BM_MODULE_AUTH?to?b;或select?'grant?select?on?'||table_name||'?to?b;'??from?user_tables;'GRANTSELECTON'||TABLE_NAME||'TOB;' ---------------------------------------------------- grant?select?on?VOTE_NUM?to?b; grant?select?on?TMP_MSG?to?b; grant?select?on?VOTE_IP?to?b; grant?select?on?QUESTION?to?b; grant?select?on?QUESTION_COUNT?to?b; grant?select?on?RECORD_DICT?to?b; grant?select?on?BM_COLUMN?to?b; grant?select?on?BM_COLUMN_CLASSIFY_REL?to?b;說明：在a用戶下執行該語句，執行后會生成對所有表的賦權限語句，拷貝出來執行就可以了。

2.2、a用戶下授權查詢單個表給b用戶

grant?select?on?a.tablename?to?b;

2.3、a用戶下授權查詢所有序列給b用戶

select?'grant?select?on?'?||?sequence_name?||?'?to?b;'?from?dba_sequences?where?sequence_owner='A';

?

2.4、--Oracle查詢用戶視圖

select?*?from?user_views;

2.5、a用戶下授權查詢視圖給test11用戶

select?'grant?select?on?a.'?||?view_name?||?'?to?test11;'?from?user_views;視圖查詢如下：'GRANTSELECTON'||VIEW_NAME||'TOTEST11;' --------------------------------------------------------- grant?select?on?CONFIRM_RESERVATION_VIEW?to?test11; grant?select?on?DEPARTMENT_RESERVATION_VIEW?to?test11; grant?select?on?DEPART_CANCEL_RESERVATION_VIEW?to?test11; grant?select?on?DOCTOR_CANCEL_RESERVATION_VIEW?to?test11; grant?select?on?DOCTOR_RESERVATION_VIEW?to?test11; grant?select?on?GRPSS?to?test11; grant?select?on?HOSPITAL_ALL_SCHEDULE_VIEW?to?test11; grant?select?on?HOSPITAL_DEPARTMENT_VIEW?to?test11; grant?select?on?HOSPITAL_DEP_SCHEDULE_VIEW?to?test11; grant?select?on?HOSPITAL_DOCTOR_VIEW?to?test11; grant?select?on?HOSPITAL_DOC_SCHEDULE_VIEW?to?test11;'GRANTSELECTON'||VIEW_NAME||'TOTEST11;' --------------------------------------------------------- grant?select?on?PATIENT_COUNT_RESERVATION_VIEW?to?test11; grant?select?on?PATIENT_RESERVATION_VIEW?to?test11; grant?select?on?PATIENT_RESERVATION_VIEW2?to?test11; grant?select?on?PATIENT_RES_VIEW?to?test11; grant?select?on?PRVIEW?to?test11; grant?select?on?RES_VIEW?to?test11; grant?select?on?SS?to?test11;

備注：授權更新、刪除的 語法和授權查詢類似，只是關鍵字不同而已。

三、撤消權限

1、授權a用戶下取消給b用戶刪除單個表的權限

revoke delete on a.tablename from b;

2、授權a用戶下取消給b用戶更新單個表的權限

revoke update on a.tablename from b;

3、擁有dba權限的用戶下取消給b用戶創建dblink的權限

revoke create database link from b;

4、擁有dba權限的用戶下取消給tes11用戶查詢任何表的權限

revoke select any table from test11;

四、事例：

1、在rh_test用戶下授權查詢所有表給wd用戶

select?'grant?select?on?rhip_test.'?||?tname?||?'?to?wd;'?from?tab;'GRANTSELECTONRH_TEST.'||TNAME||'TOWD;' ---------------------------------------------------------------- grant?select?on?rh_test.BIZ_CODE_REL?to?wd; grant?select?on?rh_test.BIZ_RMIM_DIC?to?wd; grant?select?on?rh_test.BIZ_RMIM_VERSION?to?wd; grant?select?on?rh_test.BIZ_RMIM_VERSION_DETAIL?to?wd; grant?select?on?rh_test.BIZ_RMIM_VERSION_SUBDETAIL?to?wd; grant?select?on?rh_test.BIZ_SYSTEM_LOGIN?to?wd; grant?select?on?rh_test.BIZ_TREE_PATH?to?wd; grant?select?on?rh_test.CLINIC_TRANSFER?to?wd; grant?select?on?rh_test.CODE_SYSTEM_DIC?to?wd;'GRANTSELECTONRH_TEST.'||TNAME||'TOWD;' ---------------------------------------------------------------- grant?select?on?rh_test.ETL_PATIENT_INDEX?to?wd; grant?select?on?rh_test.HOSPITAL_DIC?to?wd; grant?select?on?rh_test.HOSPITAL_SUBSYSTEM?to?wd; grant?select?on?rh_test.MAIL_RECORD?to?wd; grant?select?on?rh_test.MEDICAL_RECORD?to?wd; grant?select?on?rh_test.PATIENT_INDEX?to?wd; grant?select?on?rh_test.RHIP_SYSCONFIG?to?wd; grant?select?on?rh_test.SYSTEMLOGIN?to?wd;將上面查出的語句執行一下即可。

2、a用戶下授權查詢單個表給test11用戶

select?'GRANT?SELECT?ON'?||?table_name?||?'to?test11;'??from?user_tables 得到的結果如下: GRANT?SELECT?ON?WEBSERVICE_USER?to?test11 GRANT?SELECT?ON?USERLESS_PATIENT?to?test11; 再把上面得到的結果逐一執行一遍: GRANT?SELECT?ON?WEBSERVICE_USER?to?test11 GRANT?SELECT?ON?USERLESS_PATIENT?to?test11;新建的表要想被userA訪問，也得執行grant語句: grant?select?on?新建的表?to?userA;

3、授權a用戶下授權更新單個表給b用戶

grant update on a.tablename to b;

4、授權a用戶下授權刪除單個表給b用戶

grant delete on a.tablename to b;

5、擁有dba權限的用戶下授權創建dblink給b用戶

grant create database link to b;

轉載于:https://blog.51cto.com/meiling/2062463

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