php - 我该如何改进这段代码？

Question

我可以只使用 1 个 sql 查询吗？

showthread.php

// Get Topic subject etc
$threadID = isset($_GET['threadID']) ? intval($_GET['threadID']) : 0;
$result = mysql_query("SELECT * FROM topics WHERE id = $threadID");

// Fetch rows
$row = mysql_fetch_assoc($result);
$subject = htmlspecialchars($row['subject']);

echo '<h2>'.$subject.'</h2>';


// Get posts that belong to this topic!
$posts = mysql_query("SELECT * FROM posts INNER JOIN users ON users.id = posts.user_id WHERE posts.topic_id = $threadID");

// posts.....
while ($post = mysql_fetch_assoc($posts)) {
    echo '<br>'.$post['message'].'';
}

Answer 1

根据我的理解，你应该能够从这样的东西中获得你需要的所有信息？ (加上或减去任何缺失的列)

SELECT topics.subject, posts.message
FROM posts 
INNER JOIN users ON users.id = posts.user_id
INNER JOIN topics ON topics.id = posts.topic_id
WHERE posts.topic_id = $threadID