Php 简单一对一聊天的MySQL数据库模式
我正在尝试使用这些模式进行简单的聊天:Php 简单一对一聊天的MySQL数据库模式,php,mysql,chat,mariadb,Php,Mysql,Chat,Mariadb,我正在尝试使用这些模式进行简单的聊天: mes_id int(10) unsigned Auto Increment mes_useid_receiver int(10) unsigned mes_useid_sender int(10) unsigned mes_date int(10) unsigned mes_message text mes_read tinyint(3) unsigned [0] mes_visibl
mes_id int(10) unsigned Auto Increment
mes_useid_receiver int(10) unsigned
mes_useid_sender int(10) unsigned
mes_date int(10) unsigned
mes_message text
mes_read tinyint(3) unsigned [0]
mes_visible_for_who int(10) unsigned NULL NULL = both; 0 = none; ID user
SELECT use_name, MAX(mes_date) AS date
FROM message JOIN user ON mes_useid_receiver=use_id
WHERE uti_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1)
GROUP BY use_id
ORDER BY date DESC
问题是,我如何获得收到和发送消息的联系人列表
我正在尝试这样的方法:
mes_id int(10) unsigned Auto Increment
mes_useid_receiver int(10) unsigned
mes_useid_sender int(10) unsigned
mes_date int(10) unsigned
mes_message text
mes_read tinyint(3) unsigned [0]
mes_visible_for_who int(10) unsigned NULL NULL = both; 0 = none; ID user
SELECT use_name, MAX(mes_date) AS date
FROM message JOIN user ON mes_useid_receiver=use_id
WHERE uti_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1)
GROUP BY use_id
ORDER BY date DESC
但是通过这个查询,我只需要获得向用户id=1发送消息的联系人,我还想获得用户id=1发送消息的联系人
编辑:
mes_id int(10) unsigned Auto Increment
mes_useid_receiver int(10) unsigned
mes_useid_sender int(10) unsigned
mes_date int(10) unsigned
mes_message text
mes_read tinyint(3) unsigned [0]
mes_visible_for_who int(10) unsigned NULL NULL = both; 0 = none; ID user
SELECT use_name, MAX(mes_date) AS date
FROM message JOIN user ON mes_useid_receiver=use_id
WHERE uti_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1)
GROUP BY use_id
ORDER BY date DESC
有了union,我几乎可以得到我想要的:
SELECT use_id, use_name, mes_read FROM message
JOIN user ON mes_useid_receiver=use_id
WHERE use_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1) GROUP BY use_id
UNION
SELECT use_id, use_name, mes_read FROM message
JOIN user ON mes_useid_sender=use_id
WHERE use_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1) GROUP BY use_id
我需要mes_日期来排序列表,但是如果我选择mes_日期,我将得到重复的行
谢谢您的帮助。如果您要进入此根目录,那么我的建议如下:
SELECT * FROM(
(SELECT use_id, use_name, mes_read ,mes_date FROM message
JOIN user ON mes_useid_receiver=use_id
WHERE use_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1)) GROUP BY use_id
UNION
(SELECT use_id, use_name, mes_read ,mes_date FROM message
JOIN user ON mes_useid_sender=use_id
WHERE use_id!=1
AND (mes_useid_receiver=1 OR mes_useid_sender=1)
AND (mes_visible_for_who IS NULL OR mes_visible_for_who=1)) GROUP BY use_id
) as d Order By mes_date desc
还要看看是否可以避免在每个选择中分组(您会感觉性能不好)
问候谢谢!使用组id的组可以在外部。