php - mysql 两个查询

Question

我有一个评论系统；我有一个问题

SELECT ShoutID,Message, User, Date, ShoutImageThumb, ShoutImageBig,UserID, 
       Email, FullName, UserImageThumb, Admin FROM shoutbox LEFT JOIN users ON 
       users.Email = shoutbox.User ORDER BY ShoutID DESC LIMIT 10

当它在页面上循环时我在循环中运行另一个查询以获取该消息的评论

SELECT users.UserID, users.Email, users.FullName, shoutboxcomments.ShoutID, 
       shoutboxcomments.`Comment`, shoutboxcomments.`Date`, 
       shoutboxcomments.`User`, shoutboxcomments.CommentID FROM shoutboxcomments 
       LEFT JOIN users ON users.Email = shoutboxcomments.User 
       WHERE ShoutID = '.$ShoutID.' ORDER BY CommentID ASC

是否可以加入这些查询或我如何简化它，因为我使用 mvc 架构在 php 中构建

Answer 1

不是对每个帖子运行一个查询，而是使用 IN 一次获取多个帖子的评论。

SELECT users.UserID, users.Email, ...
FROM shoutboxcomments
LEFT JOIN users
ON users.Email = shoutboxcomments.User
WHERE ShoutID IN (1, 4, 15, 22)
ORDER BY CommentID