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我想选择portata按类别和其他自定义字段过滤的自定义字段“”的不同值。

这是按类别选择自定义值的查询：

global $wpdb;
$querystr2 = "
SELECT DISTINCT wpostmeta.meta_value 
FROM $wpdb->posts wposts
LEFT JOIN $wpdb->postmeta wpostmeta ON wposts.ID = wpostmeta.post_id 
LEFT JOIN $wpdb->term_relationships ON (wposts.ID = $wpdb->term_relationships.object_id)
LEFT JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)


WHERE wpostmeta.meta_key = 'portata'
AND $wpdb->term_taxonomy.taxonomy = 'category'
AND $wpdb->term_taxonomy.term_id IN($variabile_c)
ORDER BY wpostmeta.meta_value ASC

";

如何将其他自定义字段添加到过滤器？

4

2 回答 2

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您需要再次针对 $wpdb->postmeta 进行连接，为每个连接使用单独的别名，并在 WHERE 子句中添加几个 AND 以应用额外的条件——例如：

 SELECT DISTINCT wpostmeta1.meta_value
   FROM $wpdb->posts wposts
     LEFT JOIN $wpdb->postmeta wpostmeta1 ON wposts.ID = wpostmeta1.post_id 
     LEFT JOIN $wpdb->postmeta wpostmeta2 ON wposts.ID = wpostmeta2.post_id 
     LEFT JOIN $wpdb->term_relationships ON (wposts.ID = $wpdb->term_relationships.object_id)
     LEFT JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)
   WHERE wpostmeta1.meta_key = 'portata'
     AND wpostmeta2.meta_key = 'other-custom-field-value'
     AND $wpdb->term_taxonomy.taxonomy = 'category'
     AND $wpdb->term_taxonomy.term_id IN($variabile_c)
   ORDER BY wpostmeta1.meta_value ASC

将“其他自定义字段值”替换为您需要过滤的第二个自定义字段值。

于 2012-10-02T04:04:02.373 回答
0

谢谢亚伦米勒！现在它工作了！

SELECT DISTINCT wpostmeta1.meta_value
FROM $wpdb->posts wposts
     LEFT JOIN $wpdb->postmeta wpostmeta1 ON wposts.ID = wpostmeta1.post_id 
     LEFT JOIN $wpdb->postmeta wpostmeta2 ON wposts.ID = wpostmeta2.post_id 
     LEFT JOIN $wpdb->term_relationships ON (wposts.ID = $wpdb->term_relationships.object_id)
     LEFT JOIN $wpdb->term_taxonomy ON ($wpdb->term_relationships.term_taxonomy_id = $wpdb->term_taxonomy.term_taxonomy_id)
WHERE wpostmeta1.meta_key = 'portata'
     AND wpostmeta2.meta_key = 'alimentazione'
AND wpostmeta2.meta_value = '$variabile_portata'
     AND $wpdb->term_taxonomy.taxonomy = 'category'
     AND $wpdb->term_taxonomy.term_id IN($variabile_c)
ORDER BY wpostmeta1.meta_value ASC

谢谢亚伦米勒。现在，如果您希望通过自定义字段添加 1 个其他文件管理器，我必须添加 1 个左连接？谢谢！

于 2012-10-02T09:16:39.143 回答