Question

我有“输入”自定义字段和两个值（免费和付费）。我需要先循环获得“付费”帖子，并免费获得最新信息。如何对查询进行排序？我不能使用wp_query。

global $wpdb;
$query = "
    SELECT *
    FROM $wpdb->posts
    INNER JOIN $wpdb->postmeta m1
      ON ( $wpdb->posts.ID = m1.post_id )
    WHERE
        $wpdb->posts.post_type = 'object'
    AND $wpdb->posts.post_status = 'publish'
    AND ( m1.meta_key = 'type' AND m1.meta_value = $type )
    GROUP BY $wpdb->posts.ID
    ORDER BY $wpdb->posts.post_date
    DESC;
  ";

Answer 1

您目前正在按post_date排序，因此最旧的将首先显示，最后一个显示最新的。对于同一日期的所有行，mysql将决定订单。如果您想保留此日期序列，但始终首先在特定日期显示付费日期，那么您只需添加第二个排序属性：

ORDER BY $wpdb->posts.post_date, meta_value DESC

DESC将确保“付费”在“免费”之前出现，如果这些是您的实际价值。这也假设只有两个值。如果你可能有更多的值，那么调查mysql CASE expression

是值得的

Answer 2

很简单。

global $wpdb;
$query = "
SELECT *
FROM $wpdb->posts
INNER JOIN $wpdb->postmeta m1
  ON ( $wpdb->posts.ID = m1.post_id )
INNER JOIN $wpdb->postmeta m2   //add this line
ON ( $wpdb->posts.ID = m2.post_id ) //add this line
WHERE
    $wpdb->posts.post_type = 'object'
AND $wpdb->posts.post_status = 'publish'
AND ( m1.meta_key = 'city' AND m1.meta_value = $city_string )
AND ( m2.meta_key = 'type' ) //add this line
GROUP BY $wpdb->posts.ID
ORDER BY m2.meta_value //add this line
DESC;
";

$ wpdb - 按两个元值排序

2 个答案: