将JSONB_ARRAY_ELEMENTS与 WHERE 一起使用..在条件下

Question

在线扑克玩家可以选择购买游戏室 1 或游戏室 2 的访问权限。

他们可以因作弊而被暂时禁止。

CREATE TABLE users (
        uid SERIAL PRIMARY KEY,
        paid1_until timestamptz NULL,     -- may play in room 1
        paid2_until timestamptz NULL,     -- may play in room 2
        banned_until timestamptz NULL,    -- punished for cheating etc.
        banned_reason varchar(255) NULL
);

这里上表填满了4条测试记录：

INSERT INTO users (paid1_until, paid2_until, banned_until, banned_reason)
VALUES (NULL, NULL, NULL, NULL),
       (current_timestamp + interval '1 month', NULL, NULL, NULL),
       (current_timestamp + interval '2 month', current_timestamp + interval '4 month', NULL, NULL),
       (NULL, current_timestamp + interval '8 month', NULL, NULL);

所有 4 条记录都属于同一个人 - 她通过不同的社交网络（例如通过 Facebook、Twitter、Apple Game Center 等）验证了自己的身份。

我正在尝试创建一个存储函数，该函数将获取数字用户 ID 列表（作为 JSON 数组）并将属于同一个人的记录合并为一条记录 - 而不会丢失她的付款或惩罚：

CREATE OR REPLACE FUNCTION merge_users(
        IN in_users jsonb,
        OUT out_uid integer)
        RETURNS integer AS
$func$
DECLARE
        new_paid1 timestamptz;
        new_paid2 timestamptz;
        new_banned timestamptz;
        new_reason varchar(255);
BEGIN
        SELECT min(uid),
                current_timestamp + sum(paid1_until - current_timestamp),
                current_timestamp + sum(paid2_until - current_timestamp),
                max(banned_until)
        INTO
                out_uid, new_paid1, new_paid2, new_banned
        FROM users 
        WHERE uid IN (SELECT JSONB_ARRAY_ELEMENTS(in_users));
        IF out_uid IS NOT NULL THEN
                SELECT banned_reason
                INTO new_reason
                FROM users
                WHERE new_banned IS NOT NULL
                AND banned_until = new_banned
                LIMIT 1;
                DELETE FROM users
                WHERE uid IN (SELECT JSONB_ARRAY_ELEMENTS(in_users))
                AND uid <> out_uid;
                UPDATE users 
                SET paid1_until = new_paid1,
                    paid2_until = new_paid2,
                    banned_until = new_banned,
                    banned_reason = new_reason
                WHERE uid = out_uid;
        END IF; 
END
$func$ LANGUAGE plpgsql;

不幸的是，它的使用会导致以下错误：

# TABLE users;
 uid |          paid1_until          |          paid2_until          | banned_until | banned_reason 
-----+-------------------------------+-------------------------------+--------------+---------------
   1 |                               |                               |              | 
   2 | 2016-03-27 19:47:55.876272+02 |                               |              | 
   3 | 2016-04-27 19:47:55.876272+02 | 2016-06-27 19:47:55.876272+02 |              | 
   4 |                               | 2016-10-27 19:47:55.876272+02 |              | 
(4 rows)
# select merge_users('[1,2,3,4]'::jsonb);
ERROR:  operator does not exist: integer = jsonb
LINE 6:         WHERE uid IN (SELECT JSONB_ARRAY_ELEMENTS(in_users))
                          ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
QUERY:  SELECT min(uid),
                current_timestamp + sum(paid1_until - current_timestamp),
                current_timestamp + sum(paid2_until - current_timestamp),
                max(banned_until)
                                                                               FROM users 
        WHERE uid IN (SELECT JSONB_ARRAY_ELEMENTS(in_users))
CONTEXT:  PL/pgSQL function merge_users(jsonb) line 8 at SQL statement

请帮助我解决问题。

为方便起见，以下是SQL代码的要点。

Answer 1

jsonb_array_elements()的结果是一组 jsonb 元素，因此您需要使用 to_jsonb() 函数将 uid 显式强制转换为 jsonb，IN将被替换为<@运算符：

WITH t(val) AS ( VALUES
  ('[1,2,3,4]'::JSONB)
)
SELECT TRUE
FROM t,jsonb_array_elements(t.val) element
WHERE to_jsonb(1) <@ element;

对于您的情况，代码段应调整为以下内容：

...SELECT ...,JSONB_ARRAY_ELEMENTS(in_users) user_ids WHERE to_jsonb(uid) <@ user_ids...