Question

我正在尝试查询Wordpress帖子。

我创建了一个自定义帖子类型People。每个people帖子都有自定义字段name，age，location，birthday等。使用高级自定义字段插件创建自定义字段。

我想查询People自定义帖子类型的所有自定义字段。

我想要这样的输出：

+----+-------------+-----------+--------+-----------------------------+----------+-----+
| id | post_title  | name          | age    | location                    | birthday   | 
+----+-------------+-----------+--------+-----------------------------+----------+-----+
|  1 | SAMPLE      | some_name     | XX     | sample_location             | 10/07/1980 |
|  1 | SAMPLE      | some_name     | XX     | sample_location             | 10/07/1980 |
|  1 | SAMPLE      | some_name     | XX     | sample_location             | 10/07/1980 |
|  1 | SAMPLE      | some_name     | XX     | sample_location             | 10/07/1980 |
|  1 | SAMPLE      | some_name     | XX     | sample_location             | 10/07/1980 |
+----+-------------+-----------+--------+-----------------------------+----------+-----+

执行此操作的正确语法是什么？

我尝试过：

SELECT * 
FROM  `wp_posts` ,  `wp_postmeta` 
WHERE  `post_type` =  'people'

但是，此列表列出了所有wordpress常规发布字段。

有人可以帮忙吗？

Answer 1

这是任何人可能遇到相同问题的解决方案！

SELECT posts_people.ID AS people_ID,
   posts_people.post_title AS people_post_title,
   (select meta_value from wp_postmeta where meta_key = 'name' AND post_id = posts_people.ID) as name,
   (select meta_value from wp_postmeta where meta_key = 'age' AND post_id = posts_people.ID) as age,
   (select post_title from wp_posts where ID = SUBSTRING_INDEX(SUBSTRING_INDEX((select meta_value from wp_postmeta where meta_key = 'location' AND post_id = posts_people.ID),'";',1),':"',-1)) as location,
   (select meta_value from wp_postmeta where meta_key = 'birthday' AND post_id = posts_people.ID) as stelexos_kinito
FROM wp_posts AS posts_people
WHERE post_type = 'people' and post_status = 'publish'

Answer 2

首先，您要从两个表中进行选择，而无需连接或设置它们之间的关系（将每个数据集连接到另一个表应该是一种关系）

您可以执行以下操作：

SELECT t1.*, t2.* 
FROM posts as t1 
INNER JOIN postmeta as t2 
ON t1.ID = t2.post_id 
WHERE t1.post_type = 'people' 
AND t2.meta_key = 'name'

**注意：您应该注意表名，并根据需要在查询中替换表中的列名。

用于自定义帖子类型的MySQL SELECT自定义字段（post_meta）

2 个答案: