从MySQL返回最新的消息 - Returning the most recent messages from MySQL?

Returning the most recent messages from MySQL?

本文关键字：消息最新返回 MySQL | 更新日期: 2023-09-26

我需要为下面的查询添加一个连接，该连接将messages_message表连接到messages_threads表，并从messages_messages中最近的行返回'body'和'time'字段，其中messages_message。Threadid = messages_threads.id.

对不起，这太令人困惑了，我不知道该怎么表达!这是我当前的查询-它正确地提取除了'body'和'time'字段的所有内容。

SELECT 
    messages_threads.id AS threadid, messages_threads.name AS recipientsname, 
    senderid, username AS sendername, pictures.url AS senderpicture
FROM 
    messages_recipients
    JOIN messages_threads 
        ON messages_threads.id = messages_recipients.threadid
    JOIN users 
        ON users.id = messages_threads.senderid
    JOIN pictures 
        ON messages_threads.senderid = pictures.userid 
        AND pictures.profile = 1
WHERE messages_recipients.userid = $userid

您可以添加messages_message表的子查询，它将为每个线程返回1行。例如:

SELECT 
    messages_threads.id AS threadid, messages_threads.name AS recipientsname, 
    senderid, username AS sendername, pictures.url AS senderpicture
FROM 
    messages_recipients
    JOIN messages_threads ON messages_threads.id = messages_recipients.threadid
    JOIN users ON users.id = messages_threads.senderid
    JOIN pictures ON messages_threads.senderid = pictures.userid AND pictures.profile = 1
    JOIN ( SELECT threadid, MAX(id) AS postid FROM messages_message GROUP BY threadid ) t ON message_threads.id = t.threadid
    JOIN messages_message ON t.threadid = messages_message.threadid AND t.postid = messages_message.id
WHERE messages_recipients.userid = $userid

我想你也需要按身体和时间分组…