我需要从 Post 表中进行选择，每个帖子都与一个类别和标签相关。我需要选择特定的标签/s 和/或类别/s。术语表有自定义字段“menu_order”，用于设置类别顺序。我想按该字段对帖子进行排序。如果我做简单的选择：
SELECT * from wp_posts
LEFT
JOIN wp_term_relationships
ON ( wp_term_relationships.object_id = wp_posts.ID )
LEFT
JOIN wp_terms
ON ( wp_terms.term_id = wp_term_relationships.term_taxonomy_id )
WHERE 1=1
AND wp_posts.post_type = 'post'
AND (
wp_posts.post_status = 'publish'
OR wp_posts.post_status = 'private'
)
LIMIT 0, 20
我得到结果：
+----------------+----------------+----------+---------------------+
| POST ID | Term name | order | type |
+----------------+----------------+----------+---------------------+
| 2 | Fire | 1 | category |
+----------------+----------------+----------+---------------------+
| 2 | blue | 0 | tag |
+----------------+----------------+----------+---------------------+
这只是介绍。
如果我这样做 WHERE $wpdb->terms.term_id = 170 what is a TAG 我只有一个回报。
+----------------+----------------+----------+---------------------+
| POST ID | Term name | order | type |
+----------------+----------------+----------+---------------------+
| 2 | blue | 0 | tag |
+----------------+----------------+----------+---------------------+
我需要选择 POSTS，按类别或/和标签过滤，然后从附加到 POST 的类别中获取 TERM_ORDER。
因此，无论我有什么结果，订单总是从相关类别中提取。
由于我在 MYSQL 方面不那么强，这让我感到困惑。任何输入都会有所帮助:)
更新------------------------------------------------ -
所以，在疯狂编码之后，我设法得到了我想要的东西。不要屏住呼吸，因为这可能既丑陋又缓慢，但很有效。
首先，我创建收集所有产品的视图。
$qqquery = "
CREATE VIEW samsam AS
SELECT
ID, post_content, post_title, post_excerpt, post_status, post_name, guid, post_type, $wpdb->term_relationships.term_taxonomy_id as cat_term_taxonomy_id, tt1.term_taxonomy_id as tag_term_taxonomy_id
FROM $wpdb->posts
LEFT
JOIN $wpdb->term_relationships
ON ( $wpdb->term_relationships.object_id = $wpdb->posts.ID )
LEFT
JOIN $wpdb->term_relationships AS tt1
ON ( tt1.object_id = $wpdb->posts.ID )
WHERE 1=1
AND $wpdb->posts.post_type = 'post'
AND (
$wpdb->posts.post_status = 'publish'
OR $wpdb->posts.post_status = 'private'
)
AND ( wp_term_relationships.term_taxonomy_id IN ( $query_cat ) // ID's of categories, seperated by coma
AND tt1.term_taxonomy_id IN (' . $add_query_tag_id . ') //ID's of POSTS seperated by coma
)
ORDER BY $wpdb->term_relationships.term_taxonomy_id DESC
";
$wpdb->query($qqquery);
之后，我会查询我在哪里选择视图并连接关系和术语，以通过过滤掉 order > 0 来获取类别顺序，然后按 id 分组以过滤掉重复项。
$querystr = "
SELECT * from samsam
LEFT
JOIN $wpdb->term_relationships
ON (samsam.ID = $wpdb->term_relationships.object_id)
LEFT
JOIN $wpdb->terms
ON ($wpdb->terms.term_id = $wpdb->term_relationships.term_taxonomy_id)
AND ($wpdb->terms.menu_order > 0)
WHERE menu_order > 0
GROUP BY ID
ORDER BY menu_order ASC
LIMIT $item_limit_offset, $item_limit_pp"; // first is calculation of products to skip, second is how many posts per page
$pageposts = $wpdb->get_results($querystr, OBJECT);
它能做什么：
类别1（有订单1）post post post
类别 3（有订单 2）post post post
类别 2 (有订单 3) post post post
可以通过标签和/或类别进行限制、偏移、分页、过滤。
我使用了插件“Term Menu Order”，它为订单类别添加了额外的字段。
祝你今天过得愉快。