Question

我是mysql的新手，我在从mysql数据库中选择数据时遇到了问题：

$post_id = 3;
$current_user_id = 1;

$query = "SELECT `comments`.*, `users`.`username`, `users`.`image` FROM (`comments`)
LEFT JOIN `users` ON `comments`.`user_id` = `users`.`id`
WHERE `comments`.`post_id` =  '$post_id'
AND `comments`.`status` =  1
AND `users`.`status` =  1
ORDER BY `comments`.`date` desc";

此选择，从数据库中选择所有已批准的注释，但在此选择中，我需要$ current_user_id的所有未批准的注释，

结果必须如下：

[所有已批准的帖子评论] + [所有未批准的$ current_user_id帖子评论]

Answer 1

不确定这是否真的有效，但只是试试看。我无法测试查询，因为我们没有架构。

SELECT `comments`.*, `users`.`username`, `users`.`image` FROM (`comments`)
LEFT JOIN `users` ON `comments`.`user_id` = `users`.`id`
WHERE `comments`.`post_id` =  '$post_id'
AND (
   (`comments`.`status` =  1 AND `users`.`status` =  1)
  OR
   ( `comments`.`status` =  0 AND `users`.`id`= '$current_user_id' )
)
ORDER BY `comments`.`date` desc

我的想法是选择所有approved comments OR（未经批准但来自此用户的评论）。你可能不得不改变查询，直到你得到你真正需要的东西，我只是给你这个想法，而不是确切的查询。希望这会对你有所帮助。

Answer 2

SELECT `comments`.*, `users`.`username`, `users`.`image` FROM (`comments`)
LEFT JOIN `users` ON `comments`.`user_id` = `users`.`id`
WHERE `comments`.`post_id` =  '$post_id'
AND `comments`.`status` =  1
AND `users`.`status` =  1
UNION ALL
SELECT `comments`.*, `users`.`username`, `users`.`image` FROM (`comments`)
LEFT JOIN `users` ON `comments`.`user_id` = `users`.`id`
WHERE `comments`.`post_id` =  '$post_id'
AND `comments`.`status` =  0
AND `users`.`id` = '$current_user_id'
ORDER BY `comments`.`date` desc

选择当前用户MySQL PHP的批准评论和未批准的评论

2 个答案: