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
);
这里上表填充了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 - 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到一条记录中 - 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
请帮我解决问题。
为了您的方便,这里有一个 SQL 代码要点。