oracle權限的分配與回收

權限的分配：

1、grant用于將角色、系統權限、對象權限賦予用戶、角色。

2、賦權的前提條件：

系統權限：有"grant any privilege"的系統權限、被授予該系統權限時使用了 "admin option"

角色權限：1)授予角色角色權限時帶有"admin option";2)被授予了"grant any role"的系統權限;3)是角色的創建者。

對象權限：1)是對象的擁有者；2)被授予對象權限時帶有"grant option";3)被授予了"grant any object privilege"權限；

3、語法：

grant [grant_system_privileges|grant_object_privileges];

grant_system_privileges:

{ system_privilege| role| ALL PRIVILEGES}

[, { system_privilege| role| ALL PRIVILEGES}]...

TO grantee_clause [ WITH ADMIN OPTION ];

grantee_clause:

{ user [ IDENTIFIED BY password ]| role| PUBLIC}

  [, { user [ IDENTIFIED BY password ]| role| PUBLIC}]...

grant_object_privileges:

{ object_privilege | ALL [ PRIVILEGES ] }

[ (column [, column ]...) ]

[, { object_privilege | ALL [ PRIVILEGES ] }[ (column [, column ]...) ]]...

on_object_clause TO grantee_clause  [ WITH HIERARCHY OPTION ][ WITH GRANT OPTION ]

on_object_clause:

ON { [ schema. ] object 

   | DIRECTORY directory_name

   | EDITION edition_name

   | MINING MODEL [schema.] mining_model_name

   | JAVA { SOURCE | RESOURCE } [ schema. ] object

   }

要記住"grant 權限 to 用戶".

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權限的回收：

1、語法

REVOKE { revoke_system_privileges| revoke_object_privileges} ;

revoke_system_privileges：

{ system_privilege| role| ALL PRIVILEGES}

  [, { system_privilege

     | role

     | ALL PRIVILEGES

     }

  ]...

FROM grantee_clause

revoke_object_privileges：

{ object_privilege | ALL [ PRIVILEGES ] }

  [, { object_privilege | ALL [ PRIVILEGES ] } ]...

on_object_clause

FROM grantee_clause

[ CASCADE CONSTRAINTS | FORCE ]

grantee_clause：

{ user [ IDENTIFIED BY password ]

| role

| PUBLIC

}

  [, { user [ IDENTIFIED BY password ]

     | role

     | PUBLIC

     } 

  ]...

on_object_clause：

ON { [ schema. ] object 

   | DIRECTORY directory_name

   | EDITION edition_name

   | MINING MODEL [schema.] mining_model_name

   | JAVA { SOURCE | RESOURCE } [ schema. ] object

   }

記住"revoke 權限 from 用戶"

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系統權限不能級聯回收，對象權限可以級聯回收。

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