Wordpress WP_List_Table排序数据查询问题

Question

我使用的是 wordpress 5.5 和 php 7.4 以及 mysql 5.7.30 我正在为我的电子商务系统使用 woocomerce 订阅插件。我想要的是能够在管理面板中显示 paginatd 订阅列表并且（重要部分）根据管理面板中的“next_payment_schedule”、“first_payment_schedule”日期对它们进行排序。 woocommerce 订阅插件将所有订阅保存为自定义 post 类型，其类型为：“shop_subscription”，并且还将所有特定字段保存在 postmeta table.

正如我所说，问题是这个插件将这些日期保存在 post 元 table 中。如何同时支持分页和排序？

这是我当前的查询：

SELECT p.id AS post_id, p.post_status, u.id AS user_id , u.user_login, u.user_email, GROUP_CONCAT(pm.meta_value)
FROM posts AS p
INNER JOIN users AS u ON p.post_author = u.id
INNER JOIN postmeta AS pm ON pm.post_id = p.id 
WHERE post_type = 'shop_subscription'
AND pm.meta_key in ('_schedule_start', '_schedule_next_payment')
GROUP BY p.id
ORDER BY user_login ASC

当我想处理分页时，这个查询很好。

当我想处理排序时，下面的查询很好，

SELECT p.id AS post_id, p.post_title, p.post_status, p.post_name, u.id AS user_id , u.user_login, u.user_email, pm.meta_key, pm.meta_value from posts AS p
INNER JOIN postmeta AS pm ON pm.post_id = p.id 
INNER JOIN users AS u ON p.post_author = u.id 
WHERE post_type = 'shop_subscription' 
AND pm.meta_key in ('_schedule_start', '_schedule_next_payment') 
ORDER BY CASE WHEN pm.meta_key IN('_schedule_next_payment') THEN pm.meta_value END desc

我该如何处理这种情况？

Answer 1

最后我使用这个查询解决了我的问题：

        $sql = "SELECT p.id AS post_id, p.post_status, u.id AS user_id , u.user_login, u.user_email, pm2.schedule_start,  pm2.schedule_next_payment
                FROM `$wpdb->posts` AS p
                INNER JOIN `$wpdb->users` AS u ON p.post_author = u.id
                INNER JOIN (
                    SELECT t.post_id, 
                           MAX(t.schedule_start) AS schedule_start, 
                           MAX(t.schedule_next_payment) AS schedule_next_payment
                    FROM (
                
                    SELECT 
                            post_id,
                            case when pm.meta_key = '_schedule_start' then pm.meta_value else 0 end AS schedule_start,
                            case when pm.meta_key = '_schedule_next_payment' then pm.meta_value else 0 end AS schedule_next_payment
                            FROM (SELECT * FROM `$wpdb->postmeta` pm where pm.meta_key IN ('_schedule_next_payment', '_schedule_start')) AS pm
                    ) AS t
                    GROUP BY t.post_id
                ) 
                
                AS pm2 ON pm2.post_id = p.id
                WHERE post_type = '".self::POST_TYPE."'"

如果您仔细查看以下子查询：

                    SELECT t.post_id, 
                           MAX(t.schedule_start) AS schedule_start, 
                           MAX(t.schedule_next_payment) AS schedule_next_payment
                    FROM (
                        SELECT 
                                post_id,
                                case when pm.meta_key = '_schedule_start' then pm.meta_value else 0 end AS schedule_start,
                                case when pm.meta_key = '_schedule_next_payment' then pm.meta_value else 0 end AS schedule_next_payment
                                FROM (SELECT * FROM `$wpdb->postmeta` pm where pm.meta_key IN ('_schedule_next_payment', '_schedule_start')) AS pm
                        ) AS t
                    GROUP BY t.post_id

你可以看到我更改了 postmeta table 列和行（旋转 table）我可以很容易地将它与我的帖子一起加入 table 并根据这两个日期字段进行排序。

Wordpress WP_List_Table排序数据查询问题

Wordpress WP_List_Table sort data query problem

mysql

sql

wordpress

woocommerce

woocommerce-subscriptions