Question

我有一个wordpress网站，我有一个wp_query，其中包含以下参数：

array(
    'post_status' => 'publish',
    'post_type' => 'post',
    'offset' => 0,
    'posts_per_page' => 21,
    'tax_query' =>
        array(
            0 => array(
                    'taxonomy' => 'category',
                    'field' => 'id',
                    'terms' => 5
            ),
            1 => array(
                    'taxonomy'] =>'category',
                    'field'] =>'id',
                    'terms'] =>17
            ),
            2 => array(
                    'taxonomy'] =>'category'
                    'field'] =>'id'
                    'terms'] =>20
            ),
            3 => array(
                    'taxonomy' => 'category'
                    'field' => 'id'
                    'terms' => 33
            ),
            4 => array(
                    'taxonomy' => 'category',
                    'field' => 'id',
                    'terms' => 55
            ),
            5 => array(
                    'taxonomy' => 'category',
                    'field' => 'id',
                    'terms' => 83
            ),
            'relation' => 'OR'
        )
    )

这个问题是每次帖子发生变化时，这个查询都需要几分钟才能完成。以前有人有这个问题吗？这样就生成了这样的sql：

SELECT SQL_CALC_FOUND_ROWS wp_posts.ID 
FROM wp_posts 
INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id)
INNER JOIN wp_term_relationships AS tt1 ON (wp_posts.ID = tt1.object_id) 
INNER JOIN wp_term_relationships AS tt2 ON (wp_posts.ID = tt2.object_id) 
INNER JOIN wp_term_relationships AS tt3 ON (wp_posts.ID = tt3.object_id) 
INNER JOIN wp_term_relationships AS tt4 ON (wp_posts.ID = tt4.object_id) 
INNER JOIN wp_term_relationships AS tt5 ON (wp_posts.ID = tt5.object_id) 

WHERE 1=1 
AND ( wp_term_relationships.term_taxonomy_id IN (5) 
OR tt1.term_taxonomy_id IN (17) 
OR tt2.term_taxonomy_id IN (20) 
OR tt3.term_taxonomy_id IN (33) 
OR tt4.term_taxonomy_id IN (55) 
OR tt5.term_taxonomy_id IN (83) ) 
AND wp_posts.post_type = 'post' 
AND ((wp_posts.post_status = 'publish')) 

GROUP BY wp_posts.ID 
ORDER BY wp_posts.post_date DESC 
LIMIT 0, 21

感谢您的帮助。

Answer 1

你可以做的一件事是调整tax_query参数;你加入了同一个表六次，每一个都有一个IN语句 - 正如你所注意到的那样，它产生了一些非常低效的SQL。

manual page for WP_Query有一些tax_query示例，看起来您可以将所有这些不同的ID组合到一个实体中，这将大大降低SQL复杂性。

array(
    'post_status' => 'publish',
    'post_type' => 'post',
    'offset' => 0,
    'posts_per_page' => 21,
    'tax_query' =>
        array(
            0 => array(
                    'taxonomy' => 'category',
                    'field' => 'id',
                    'terms' => array (5, 17, 20, 33, 55, 83), 
            )            )
    )

这应该使用任何这些ID获取术语，并且应该更有效地执行。

Wordpress wp_query需要很长时间

1 个答案: