在 Wordpress 中运行自定义查询时遇到问题

Question

好的，我已经盯着这个看了好几个小时了，我看不出有什么问题。我希望你们中的一个超级聪明的人能看到我的错误。我已经复制了 select 语句并在 PHPMYAdmin 上运行它，它在那里运行正常，但它在 Wordpress 中没有返回任何结果。我还验证了 2 个变量的填充是否正确。

$user = wp_get_current_user();
$terms = wp_get_object_terms($user->ID, 'departments');
$term = $terms[0]->term_id;

$results = $wpdb->get_results(
        $wpdb->prepare(
        "SELECT post_title, post_content
        FROM wp_posts
        INNER JOIN wp_postmeta ON wp_posts.id = wp_postmeta.post_id
        INNER JOIN wp_term_relationships ON wp_posts.id = wp_term_relationships.object_id
        WHERE post_type = 'events'
        AND meta_key = 'event_date'
        AND meta_value = %s
        AND term_taxonomy_id = %s"),array($date,$term));

如果我对 $results 进行 var_dump，我只会得到 NULL。

Answer 1

您的准备​​语句中有错误...array($date,$term) 需要在准备函数中。

示例

// Bad- args outside of prepare
$results = $wpdb->get_results($wpdb->prepare($sql), $args);

// Good- args inside prepare
$results = $wpdb->get_results($wpdb->prepare($sql, $args));

相关文档

• https://developer.wordpress.org/reference/classes/wpdb/prepare/
• https://developer.wordpress.org/reference/classes/wpdb/get_results/

代码解决方案

$user = wp_get_current_user();
$terms = wp_get_object_terms($user->ID, 'departments');
$term = $terms[0]->term_id;
$results = $wpdb->get_results(
  $wpdb->prepare(
    "SELECT post_title, post_content
    FROM wp_posts
    INNER JOIN wp_postmeta ON wp_posts.id = wp_postmeta.post_id
    INNER JOIN wp_term_relationships ON wp_posts.id = wp_term_relationships.object_id
    WHERE post_type = 'events'
    AND meta_key = 'event_date'
    AND meta_value = %s
    AND term_taxonomy_id = %s",
    array($date,$term)
));