将复杂的查询更改为Zend_Db_Select对象

Question

我的查询有点复杂：

(SELECT category_id AS id, content_title AS title, content AS detail, 'content' AS type
 FROM category_content
 WHERE $where
 ORDER BY id DESC)
UNION
(SELECT news_id AS id, news_title AS title, news_detail AS detail, 'news' AS type
 FROM news
 WHERE $where
 ORDER BY id DESC)

如何将此查询更改为Zend_Db_Select对象？

Answer 1

要使用Zend_Db_Select构建UNION查询，首先将每个子查询构建为单独的Zend_Db_Select对象，然后将它们组合在一起：

$catSelect = $db->select()-> ... ;
$newsSelect = $db->select()-> ... ;

$unionSelect = $db->select()->union($catSelect, $newsSelect);