我为我的问题准备了a simple test case英镑.
在基于PostgreSQL 14.2的an online word game for 2 players中,当有人行为不端时,我将他们的"静音"列设置为"真".
然后,来自被惩罚用户的聊天信息应该对其他人隐藏.
除了受惩罚的用户自己???? - 他们应该看到所有的聊天信息,这样他们就不会注意到自己被静音了,也不会创建新的游戏帐号.
我已经为他们的头像做了这个把戏????
所以我准备了一个简单的测试用例,下面是我的4个表:
CREATE TABLE words_users (
uid SERIAL PRIMARY KEY,
muted BOOLEAN NOT NULL DEFAULT false
);
CREATE TABLE words_social (
-- social network id
sid text NOT NULL CHECK (sid ~ '\S'),
-- social network type: 100 = Facebook, 200 = Google, etc.
social integer NOT NULL CHECK (0 < social AND social <= 256),
given text NOT NULL CHECK (given ~ '\S'),
uid integer NOT NULL REFERENCES words_users ON DELETE CASCADE,
PRIMARY KEY(sid, social)
);
CREATE TABLE words_games (
gid SERIAL PRIMARY KEY,
player1 integer REFERENCES words_users(uid) ON DELETE CASCADE NOT NULL CHECK (player1 <> player2),
player2 integer REFERENCES words_users(uid) ON DELETE CASCADE
);
CREATE TABLE words_chat (
cid BIGSERIAL PRIMARY KEY,
created timestamptz NOT NULL,
gid integer NOT NULL REFERENCES words_games ON DELETE CASCADE,
uid integer NOT NULL REFERENCES words_users ON DELETE CASCADE,
msg text NOT NULL
);
然后我用测试数据填充表格:
-- create 2 users: one is ok, while the other is muted (punished)
INSERT INTO words_users (uid, muted) VALUES (1, false), (2, true);
INSERT INTO words_social (sid, social, given, uid) VALUES ('abc', 100, 'Nice user', 1), ('def', 200, 'Bad user', 2);
-- put these 2 users into a game number 10
INSERT INTO words_games (gid, player1, player2) VALUES (10, 1, 2);
-- start chatting
INSERT INTO words_chat (gid, uid, created, msg) VALUES
(10, 1, CURRENT_TIMESTAMP + INTERVAL '1 min', 'Hi how are you doing?'),
(10, 1, CURRENT_TIMESTAMP + INTERVAL '2 min', 'I am a nice user'),
(10, 2, CURRENT_TIMESTAMP + INTERVAL '3 min', 'F*** ***!!'),
(10, 2, CURRENT_TIMESTAMP + INTERVAL '4 min', 'I am a bad user'),
(10, 1, CURRENT_TIMESTAMP + INTERVAL '5 min','Are you there??');
最后是我正在努力改进的SQL函数:
CREATE OR REPLACE FUNCTION words_get_chat(
in_gid integer,
in_social integer,
in_sid text
) RETURNS TABLE (
out_mine integer,
out_msg text
) AS
$func$
-- TODO display messages by muted users only to themselves
SELECT
CASE WHEN c.uid = s.uid THEN 1 ELSE 0 END,
c.msg
FROM words_chat c
JOIN words_games g USING (gid)
JOIN words_social s ON s.uid IN (g.player1, g.player2)
WHERE c.gid = in_gid
AND s.social = in_social
AND s.sid = in_sid
ORDER BY c.CREATED ASC;
$func$ LANGUAGE sql;
SELECT words_get_chat(10, 100, 'abc') AS nice_user;
SELECT words_get_chat(10, 200, 'def') AS muted_user;
目前存储的功能显示所有聊天信息,但我想为其他所有人隐藏来自静音玩家的信息(在下面的屏幕截图中用红线显示):
请帮助我改进我的SQL函数,并注意,出于性能原因,我不想切换到PL/pgSQL.