授予使用函数的视图的选择权
我正在使用 postgresql 8.4，当视图使用任何数据库函数时，从不同用户拥有的数据库中授予视图的选择权限时遇到一些问题。
作为新用户，当我尝试运行时，例如 select * from users_pwd; 其中 users_pwd 定义为：
create view users_pwd as
select *, get_pwd(id)
from users;
和 get_pwd 为：
CREATE OR REPLACE FUNCTION get_pwd(p_id integer)
RETURNS text AS
$BODY$
declare u record;
BEGIN
select into u * from users where id = p_id;
return u.password;
END;
$BODY$
LANGUAGE plpgsql;
我收到以下错误：
ERROR: permission denied for relation users
CONTEXT: SQL statement "select * from users where id = $1 "
PL/pgSQL function "get_pwd" line 3 at SQL statement
让用户查询的唯一方法view 的目的是显式授予对表用户的选择，这是我不想做的。
如果视图不使用任何函数，而只是新用户没有显式访问权限的其他表，则它可以正常工作。
I'm using postgresql 8.4 and am having a bit of a problem granting select privileges on a view from a database onwed by a different user when the view uses any of the databases functions.
As the new user, when I try to run, for example select * from users_pwd; where users_pwd is defined as:
create view users_pwd as
select *, get_pwd(id)
from users;
and get_pwd as:
CREATE OR REPLACE FUNCTION get_pwd(p_id integer)
RETURNS text AS
$BODY$
declare u record;
BEGIN
select into u * from users where id = p_id;
return u.password;
END;
$BODY$
LANGUAGE plpgsql;
I get the following error:
ERROR: permission denied for relation users
CONTEXT: SQL statement "select * from users where id = $1 "
PL/pgSQL function "get_pwd" line 3 at SQL statement
The only way to have the user query the view is to explicitly grant select on the table users which I don't want to do.
If a view doesn't use any function, but rather just other tables which the new user doesn't have explicit access to it works perfectly fine.
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您可以创建具有可以从表用户中选择的所有者的函数。这样的函数应该使用 SECURITY DEFINER 子句创建，因此它将以所有者权限执行。
您可以在这里找到更多信息： http://www.postgresql.org/ docs/9.0/interactive/sql-createfunction.html
您还可以授予函数的 EXECUTE 权限。请参阅文档中的 GRANT 。
You could create the function with owner who can select from the table users. Such a function should be created with SECURITY DEFINER clause, so it will be executed with the owner rights.
More information you can find here: http://www.postgresql.org/docs/9.0/interactive/sql-createfunction.html
You can also GRANT EXECUTE privileges on functions. See GRANT in the docs.