WordPress的子查詢通過自定義的WordPress插件返回上SELECT

Question

我執行這個查詢與核心的cron超過1行：

// MAKE SQL CALL 
    $SQL = "SELECT ".$wpdb->prefix."postmeta.post_id FROM ".$wpdb->prefix."postmeta 
    INNER JOIN ".$wpdb->prefix."posts ON (".$wpdb->prefix."posts.ID = ".$wpdb->prefix."postmeta.post_id)  
    WHERE ".$wpdb->prefix."postmeta.meta_key = '".$core_admin_values['listing_expiration']['key']."' 
    AND ".$wpdb->prefix."posts.post_status = 'publish' 
    AND ".$wpdb->prefix."postmeta.post_id = (SELECT ".$wpdb->prefix."postmeta.post_id FROM ".$wpdb->prefix."postmeta WHERE ".$wpdb->prefix."postmeta.meta_key = 'listing_status' AND ".$wpdb->prefix."postmeta.meta_value != 1) 
    AND ".$wpdb->prefix."posts.post_type = '".$core_admin_values['listing_expiration']['taxonomy']."_type' 
    AND DATE(".$wpdb->prefix."postmeta.meta_value) < DATE(NOW())";  
    $expired_listings = (array)$wpdb->get_results($SQL); 

但這個錯誤：

FastCGI sent in stderr: "PHP message: Database error of WordPress Subquery returns more than 1 row for SELECT

如何解決這個問題？我在Stack中嘗試了一些類似問題的解決方案，但仍然失敗。

Answer 1

爲便於清晰起見，我重新格式化您的查詢。

SELECT 
    postmeta.post_id 
FROM 
    postmeta 
    INNER JOIN posts 
    ON (posts.ID = postmeta.post_id)  
WHERE 
    postmeta.meta_key = '".$core_admin_values['listing_expiration']['key']."' 
    AND posts.post_status = 'publish' 
    AND postmeta.post_id = 
    (
     SELECT 
     postmeta.post_id 
     FROM 
     postmeta 
     WHERE 
     postmeta.meta_key = 'listing_status' 
     AND postmeta.meta_value != 1 
) 
    AND posts.post_type = '".$core_admin_values['listing_expiration']['taxonomy']."_type' 
    AND DATE(postmeta.meta_value) < DATE(NOW())";  

我懷疑你的問題源於你的where子句中的子查詢。

 SELECT 
     postmeta.post_id 
     FROM 
     postmeta 
     WHERE 
     postmeta.meta_key = 'listing_status' 
     AND postmeta.meta_value != 1 

而且這個塊返回多個結果。如果要匹配多個結果，請從「=」更改爲「in」，如下所示：

AND postmeta.post_id in 
    (
     SELECT 
     postmeta.post_id ... 
) 

Answer 2

嘗試在子查詢

添加LIMIT //使SQL CALL

$SQL = "SELECT ".$wpdb->prefix."postmeta.post_id FROM ".$wpdb->prefix."postmeta 
    INNER JOIN ".$wpdb->prefix."posts ON (".$wpdb->prefix."posts.ID = ".$wpdb->prefix."postmeta.post_id)  
    WHERE ".$wpdb->prefix."postmeta.meta_key = '".$core_admin_values['listing_expiration']['key']."' 
    AND ".$wpdb->prefix."posts.post_status = 'publish' 
    AND ".$wpdb->prefix."postmeta.post_id = (SELECT ".$wpdb->prefix."postmeta.post_id FROM ".$wpdb->prefix."postmeta WHERE ".$wpdb->prefix."postmeta.meta_key = 'listing_status' AND ".$wpdb->prefix."postmeta.meta_value != 1 LIMIT 1) 
    AND ".$wpdb->prefix."posts.post_type = '".$core_admin_values['listing_expiration']['taxonomy']."_type' 
    AND DATE(".$wpdb->prefix."postmeta.meta_value) < DATE(NOW())";  
    $expired_listings = (array)$wpdb->get_results($SQL);