如何从 pl/pgsql 调用 DROP USER？

Question

如何从 Pl/PgSql 调用 DROP USER（参见示例）？

CREATE PROCEDURE myfunc()
LANGUAGE PLPGSQL AS
$$
DECLARE
  super_users TEXT[];
  ldap_users TEXT[];
  u TEXT;
BEGIN
  super_users := ARRAY(SELECT usename::TEXT FROM pg_catalog.pg_user WHERE usesuper);
  ldap_users := ARRAY(SELECT uid::TEXT FROM ldap_users);

  FOREACH u IN ARRAY ldap_users LOOP
    IF (u <> 'postgres' AND u <> ALL(super_users)) THEN
      DROP USER IF EXISTS u;
    END IF;
  END LOOP;
END;
$$;

导致“角色你不存在”的错误...

恕我直言 PL/PGSQL 不将 u 视为变量，而是作为名称。 DROP USER... 不是 SQL 而是一些扩展。怎么做？也许一些系统功能？或者用特殊语法代替 u?

编辑：我的解决方案（刚找到）：

DECLARE
  stm TEXT;
  ...
BEGIN
  ...
  stm := 'DROP USER IF EXISTS "' || u '"';
  EXECUTE stm;
...

似乎有效。也许还有其他解决方案？更规范？

Answer 1

为此你需要 dynamic SQL:

execute format('DROP USER IF EXISTS %I', u);

Answer 2

试试这个：

DROP OWNED BY user;
DROP ROLE user;
DROP USER user;

对我有用

P.d：查看SOF后，可以试试：

REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA public FROM user;
REVOKE ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA public FROM user;
REVOKE ALL PRIVILEGES ON ALL FUNCTIONS IN SCHEMA public FROM user;
DROP USER user;

干杯伙计。

如何从 pl/pgsql 调用 DROP USER？

How to call DROP USER from pl/pgsql?

postgresql

plpgsql

dynamic-sql