Question

有没有办法获取Wordpress帖子，以便元调用实际上不进行数据库调用？

例如，我目前有：

$args = array(
  'posts_per_page' => 1000,
  'post_type' => 'portfoliosample'
  );
$query = new WP_Query($args);
while($query->have_posts()):
  $query->the_post();
  $style = '';
  if(has_post_thumbnail($post->ID)){
    $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' );
    $largeurl = $image[0];
    $style = ' style="background-image:url('.$largeurl.');"';
  }

?>
    <li id="post-<?php the_ID(); ?>" <?php post_class('half'); ?>>
      <a href="<?php the_permalink()?>"<?php echo $style?> ng-click="lightbox('portfolio','<?php the_permalink()?>')">
        <h3 class="entry-title caps"><?php echo strtoupper(the_title('', '', false)); ?></h3>
        </a>
    </li>
<?php
endwhile;

the_title()之类的内容不会进行数据库调用，因为post具有该信息。但是，$post似乎没有帖子的缩略图ID或缩略图的图像来源如果我这样做一个自定义查询：

global $wpdb;
$query = "
    SELECT posts.*
    FROM $wpdb->posts posts
    WHERE posts.post_type = 'portfoliosample'
    AND posts.post_status = 'publish'
    ORDER BY posts.menu_order ASC
";
$pageposts = $wpdb->get_results($query, OBJECT);
if($pageposts)
{
    global $post;
    foreach($pageposts as $post)
    {
        setup_postdata($post);
        $style = '';
        if(has_post_thumbnail($post->ID)){
            $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' );
            $largeurl = $image[0];
            $style = ' style="background-image:url('.$largeurl.');"';
        }
        ?>
        <li id="post-<?php the_ID(); ?>" <?php post_class('half'); ?>>
            <a href="<?php the_permalink()?>"<?php echo $style?> ng-click="lightbox('portfolio','<?php the_permalink()?>')">
                <h3 class="entry-title caps"><?php echo strtoupper(the_title('', '', false)); ?></h3>
            </a>
        </li><!-- #post-## -->
        <?php
    }
}

我可以同时获取元数据但是仍然允许get_post_thumbnail()之类的函数吗？我希望setup_postdata()有办法解决这个问题。

Answer 1

没有办法做我想做的事。您要么必须手动执行这些功能所做的一切，要么允许它们进行数据库调用。

Answer 2

试试这个（未经测试，可能有点破，但应该让你朝着正确的方向前进）：

$querystr = "
SELECT $wpdb->posts.*, $wpdb->postmeta.*
FROM $wpdb->posts
LEFT JOIN $wpdb->postmeta ON {$wpdb->postmeta}.id = {$wpdb->post}.id
WHERE $wpdb->posts.post_status = 'publish' 
AND $wpdb->postmeta.key = '_thumbnail_id'
AND $wpdb->posts.post_type = 'portfoliosample'
";

$pageposts = $wpdb->get_results($querystr, OBJECT);

然后像这样循环：

<?php if ($pageposts): ?>
<?php global $post; ?>
<?php foreach ($pageposts as $post): ?>
<?php setup_postdata($post); ?>

<div class="post" id="post-<?php the_ID(); ?>">
<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>">
    <?php the_title(); ?></a></h2>
    <small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>
    <div class="entry">
      <?php the_content('Read the rest of this entry »'); ?>
    </div>
    <p class="postmetadata">Posted in <?php the_category(', ') ?> | <?php edit_post_link('Edit', '', ' | '); ?>  
    <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p>
</div>
<?php endforeach; ?>
<?php else : ?>
    <h2 class="center">Not Found</h2>
    <p class="center">Sorry, but you are looking for something that isn't here.</p>
    <?php include (TEMPLATEPATH . "/searchform.php"); ?>
<?php endif; ?>

您必须从$ post获取实际的元值，而不是使用WP post元函数，但至少您将在一个查询中获得数据。

如果你想进一步采取并获取完整的文件信息，你将不得不做额外的连接（再次，我确定它没有正确编写，但它会给你正确的想法，而不是*你只想抓住你需要的字段）

$querystr = "
SELECT post.*, pm.*, attach.*
FROM $wpdb->posts post
LEFT JOIN $wpdb->postmeta pm ON pm.id = {$wpdb->post}.id
LEFT JOIN $wpdb->posts attach ON attach.id = pm.id
WHERE post.post_status = 'publish' 
AND pm.key = '_thumbnail_id'
AND post.post_type = 'portfoliosample'
";

$pageposts = $wpdb->get_results($querystr, OBJECT);

获取Wordpress帖子，以便get_post_thumbnail_id之类的东西不会进行数据库调用

2 个答案: