ALTER ROW LEVEL SECURITY POLICY

功能描述

对已存在的行访问控制策略（包括行访问控制策略的名称，行访问控制指定的用户，行访问控制的策略表达式）进行修改。

注意事项

表的所有者或管理员用户才能进行此操作。

语法格式

  1. ALTER [ ROW LEVEL SECURITY ] POLICY [ IF EXISTS ] policy_name ON table_name RENAME TO new_policy_name;
  3. ALTER [ ROW LEVEL SECURITY ] POLICY policy_name ON table_name
  4.     [ TO { role_name | PUBLIC } [, ...] ]
  5.     [ USING ( using_expression ) ];

参数说明

  • policy_name

    行访问控制策略名称。

  • table_name

    行访问控制策略的表名。

  • new_policy_name

    新的行访问控制策略名称。

  • role_name

    行访问控制策略应用的数据库用户，可以指定多个用户，PUBLIC表示应用到所有用户。

  • using_expression

    行访问控制的表达式，返回值为boolean类型。

示例

  1. --创建数据表all_data
  2. postgres=# CREATE TABLE all_data(id int, role varchar(100), data varchar(100));
  4. --创建行访问控制策略，当前用户只能查看用户自身的数据
  5. postgres=# CREATE ROW LEVEL SECURITY POLICY all_data_rls ON all_data USING(role = CURRENT_USER);
  6. postgres=# \d+ all_data
  7.                                Table "public.all_data"
  8.  Column |          Type          | Modifiers | Storage  | Stats target | Description
  9. --------+------------------------+-----------+----------+--------------+-------------
  10.  id     | integer                |           | plain    |              |
  11.  role   | character varying(100) |           | extended |              |
  12.  data   | character varying(100) |           | extended |              |
  13. Row Level Security Policies:
  14.     POLICY "all_data_rls"
  15.       USING (((role)::name = "current_user"()))
  16. Has OIDs: no
  17. Location Nodes: ALL DATANODES
  18. Options: orientation=row, compression=no
  20. --修改行访问控制all_data_rls的名称
  21. postgres=# ALTER ROW LEVEL SECURITY POLICY all_data_rls ON all_data RENAME TO all_data_new_rls;
  23. --修改行访问控制策略影响的用户
  24. postgres=# ALTER ROW LEVEL SECURITY POLICY all_data_new_rls ON all_data TO alice, bob;
  25. postgres=# \d+ all_data
  26.                                Table "public.all_data"
  27.  Column |          Type          | Modifiers | Storage  | Stats target | Description
  28. --------+------------------------+-----------+----------+--------------+-------------
  29.  id     | integer                |           | plain    |              |
  30.  role   | character varying(100) |           | extended |              |
  31.  data   | character varying(100) |           | extended |              |
  32. Row Level Security Policies:
  33.     POLICY "all_data_new_rls"
  34.       TO alice,bob
  35.       USING (((role)::name = "current_user"()))
  36. Has OIDs: no
  37. Location Nodes: ALL DATANODES
  38. Options: orientation=row, compression=no, enable_rowsecurity=true
  40. --修改行访问控制策略表达式
  41. postgres=# ALTER ROW LEVEL SECURITY POLICY all_data_new_rls ON all_data USING (id > 100 AND role = current_user);
  42. postgres=# \d+ all_data
  43.                                Table "public.all_data"
  44.  Column |          Type          | Modifiers | Storage  | Stats target | Description
  45. --------+------------------------+-----------+----------+--------------+-------------
  46.  id     | integer                |           | plain    |              |
  47.  role   | character varying(100) |           | extended |              |
  48.  data   | character varying(100) |           | extended |              |
  49. Row Level Security Policies:
  50.     POLICY "all_data_new_rls"
  51.       TO alice,bob
  52.       USING (((id > 100) AND ((role)::name = "current_user"())))
  53. Has OIDs: no
  54. Location Nodes: ALL DATANODES
  55. Options: orientation=row, compression=no, enable_rowsecurity=true

相关链接

CREATE ROW LEVEL SECURITY POLICY，DROP ROW LEVEL SECURITY POLICY