[英]Wordpress: Filter category on multisite posts query
首先,我之前没有进行任何自定义SQL查询,所以请耐心等待。
我有一个包含多个博客的多站点安装。 以下函数查询所有博客的最新帖子,并且效果很好。
工作代码,取自https://gist.github.com/mhulse/5718743
function recent_ms_posts($count = 10, $cat, $ignore = array('')) {
global $wpdb, $table_prefix;
$ignore = implode(', ', array_map('absint', $ignore));
$rows = NULL;
$tables = array();
$query = '';
$i = 0;
$posts = array();
$post = NULL;
$rows = $wpdb->get_results($wpdb->prepare("SELECT blog_id FROM $wpdb->blogs WHERE blog_id NOT IN ($ignore) AND public = '1' AND archived = '0' AND mature = '0' AND spam = '0' AND deleted = '0'", 0), ARRAY_A);
if ($rows) {
foreach ($rows as $row) {
$tables[$row['blog_id']] = $wpdb->get_blog_prefix($row['blog_id']) . 'posts';
}
if (count($tables)) {
foreach ($tables as $blog_id => $table) {
if ($i)
$query .= ' UNION ';
$query .= " (SELECT ID, post_date, $blog_id as `blog_id` FROM $table WHERE post_status = 'publish' AND post_type = 'post')";
$i++;
}
$query .= " ORDER BY post_date DESC LIMIT 0, $count;";
$rows = $wpdb->get_results($query);
if ($rows) {
foreach ($rows as $row) {
$post = get_blog_post($row->blog_id, $row->ID);
$post->blog_id = $row->blog_id;
$post->row_id =$row->ID;
$post->permalink = get_blog_permalink($row->blog_id, $row->ID);
$posts[] = $post;
}
return $posts;
}
}
}
}
我现在想做的是从某个类别中过滤掉帖子,然后尝试对查询字符串进行一些修改:
修改后的无效代码
$query .= " (SELECT ID, post_date, $blog_id as `blog_id` FROM $table WHERE post_status = 'publish' AND post_type = 'post' AND term_taxonomy.taxonomy = 'category' AND terms.slug = '$cat')";
我如何使term_taxonomy.taxonomy = 'category'
和terms.slug = '$cat'
正常工作?
好的,所以我通过更改$query
字符串并添加一些变量来解决了这个问题:
$table_posts = $table . 'posts';
$table_term_relationships = $table . 'term_relationships';
$table_term_taxonomy = $table . 'term_taxonomy';
$table_terms = $table . 'terms';
if ($i)
$query .= ' UNION ';
$query .= " (
SELECT
$table_posts.ID,
$table_posts.post_date,
$blog_id as `blog_id`
FROM
$table_posts
LEFT JOIN $table_term_relationships ON ($table_posts.ID = $table_term_relationships.object_id)
LEFT JOIN $table_term_taxonomy ON ($table_term_relationships.term_taxonomy_id = $table_term_taxonomy.term_taxonomy_id)
LEFT JOIN $table_terms ON ($table_term_relationships.term_taxonomy_id = $table_terms.term_id)
WHERE
post_status = 'publish'
AND
post_type = 'post'
AND
$table_term_taxonomy.taxonomy = 'category'
AND
$table_terms.slug LIKE '$cat'
)";
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