Question

我是Wordpress编程的新手，我想制作自定义代码，问题在于：

我从几乎相同的SQL查询中获得了不同的值。第一个来自$wpdb->get_results()函数，另一个来自add_filter()函数。

那我为什么要这样做呢？它是因为我有一个数据库，其中的项目有不同的货币。因此，我希望在将其更改为默认货币后对价格进行排序，在我的情况下为USD。（我已经有了这个功能），所以问题是即使它已经相似，我也不会得到相同的post ID

以下是我在$wpdb

上撰写的查询

$results = $wpdb->get_results("
    SELECT 
        wp_posts.ID AS id,
        price.meta_value AS price_value,
        currency.meta_value AS currency_value
    FROM
        wp_posts 
        INNER JOIN " . $wpdb->postmeta . " ON (" . $wpdb->posts . ".ID = wp_postmeta.post_id) 
        INNER JOIN " . $wpdb->postmeta . " AS currency ON (" . $wpdb->posts . ".ID = currency.post_id AND currency.meta_key = 'month_currency') 
        INNER JOIN " . $wpdb->postmeta . " AS price ON (" . $wpdb->posts . ".ID = price.post_id AND price.meta_key = 'month_price') 
    WHERE 
        1=1 
        AND ((wp_postmeta.meta_key = 'monthly' AND wp_postmeta.meta_value = 'Y')) 
        AND wp_posts.post_type = 'post' 
        AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private')
    GROUP BY 
        wp_posts.ID 
    LIMIT 
        0, 12
");

结果是：

ID: 40168
ID: 39832
ID: 40346
ID: 40846
ID: 42200
ID: 39687
ID: 39467
ID: 29605
ID: 32620
ID: 32773
ID: 35175
ID: 17

它们之间有很多代码

这个来自add_filter函数：

$mam_global_fields = ', price.meta_value';
$mam_global_join   = " 
    INNER JOIN " . $wpdb->postmeta . " AS currency ON (" . $wpdb->posts . ".ID = currency.post_id AND cur.meta_key = 'month_currency')
    INNER JOIN " . $wpdb->postmeta . " AS price ON (" . $wpdb->posts . ".ID = price.post_id AND price.meta_key = 'month_price')";
$mam_global_orderby = "FIELD(" . $wpdb->posts . ".ID" . $order_id . ")";

以下是add_filter()

创建的查询

SELECT 
    SQL_CALC_FOUND_ROWS DISTINCT wp_posts.*, 
    price.meta_value 
FROM 
    wp_posts 
    INNER JOIN wp_postmeta ON (wp_posts.ID = wp_postmeta.post_id) 
    INNER JOIN wp_postmeta AS currency ON (wp_posts.ID = currency.post_id AND currency.meta_key = 'month_currency') 
    INNER JOIN wp_postmeta AS price ON (wp_posts.ID = price.post_id AND price.meta_key = 'month_price') 
WHERE 
    1=1 
    AND ((wp_postmeta.meta_key = 'monthly' AND wp_postmeta.meta_value = 'Y')) 
    AND wp_posts.post_type = 'post' 
    AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') 
GROUP BY 
    wp_posts.ID 
ORDER BY 
    FIELD(wp_posts.ID, 40168, 39832, 40346, 40846, 42200, 39687, 39467, 29605, 32620, 32773, 35175, 17)
LIMIT 
    0, 12

ID顺序已经正确但查询显示的另一篇文章不是ID的确切$wpdb值，那为什么会发生？

还是有更好的方法可以代替这个吗？我感谢任何帮助，谢谢

为什么$ wpdb-＆gt; get_result（）返回的值与add_filter（）中的get_posts（）不同

0 个答案: