PHP/MySQL的 - 使用一个查询的结果在其他查询中使用

Question

我有两个表，一个与职位和另一个注释：

posts 
----- 
ID 
user_ID 
text 
date 

comments 
-------- 
ID 
post_ID 
user_ID 
text 
date 

我想显示每一个岗位和每一个岗位，我想要显示相关评论。所以我做了两个查询：

include('bdd.php'); 
$reponse = $bdd->query(' 
    SELECT posts.ID AS post_ID, posts.user_ID, posts.text, posts.date FROM posts 
    ORDER BY posts.ID DESC 
'); 
while ($post = $reponse->fetch()){ 
    //displaying a post 
    $get_comments=$bdd->query('SELECT * FROM comments WHERE post_ID ='.$post['post_ID']); 
    while($comment = $get_comments->fecth()){ 
     //displaying a comment 
     echo $comment['text'] 
    } 
} 

但代码停止，只显示没有评论的第一篇文章。

Answer 1

尝试之前，首先while插入

$reponse->execute(); 

。您使用的PDO

$get_comments->fecth()检查fetch()拼写

Answer 2

是否正确选择查询？

SELECT posts.ID AS post_ID, posts.user_ID, posts.text, posts.date 
ORDER BY posts.ID DESC 

它没有FROM子句。本来应该如下：

SELECT posts.ID AS post_ID, posts.user_ID, posts.text, posts.date FROM posts 
ORDER BY posts.ID DESC