如何转换给多个连接查询ZendFrame工作查询

Question

SELECT 
`blg`.`id` , 
`blg`.`heading` , 
`blg`.`description` , 
`cat`.`name` AS `categoryname` , 
`mem`.`firstname` AS `user` , 
    (SELECT COUNT(*) FROM blog_comments WHERE blog_comments.status = '1' AND blog_comments.blogid = blg.id) AS `commentcount` 
    FROM `blogs` AS `blg` 
    INNER JOIN `blog_category` AS `cat` ON blg.category = cat.id 
    INNER JOIN `members_member` AS `mem` ON blg.user = mem.id 
    LEFT JOIN `blog_comments` AS `cmt` ON blg.id = cmt.blogid 
    WHERE (  blg.status = '1'  ) 
    GROUP BY blg.id ORDER BY `blg`.`id` ASC 

Answer 1

什么是这样的：

 $db = Zend_Db_Table::getDefaultAdapter(); 
     $select = $db->select(); 

     $dbExpr = new Zend_Db_Expr("(SELECT COUNT(*) FROM blog_comments WHERE blog_comments.status = '1' AND blog_comments.blogid = blg.id) AS `commentcount`");   

     $select->from(
        array('blg' => 'blogs'), 
        array('id', 'heading', 'description', 'name as categoryname', $dbExpr) 
       )->joinInner(
          array('cat' => 'blog_category'), 
          'blg.category = cat.id', 
          array() 
       )->joinInner(
          array('mem' => 'members_member'), 
          'blg.user = mem.id', 
          array() 
       )->joinLeft(
          array('cmt' => 'blog_comments'), 
          'blg.id = cmt.blogid', 
          array() 
       )->where('blg.status = ?', '1') 
       ->group('blg.id') 
       ->order('blg.id ASC'); 


     echo $select->assemble(); 
     exit; 

输出：

SELECT `blg`.`id`, `blg`.`heading`, `blg`.`description`, `blg`.`name` AS `categoryname`, 
(SELECT COUNT(*) FROM blog_comments WHERE blog_comments.status = '1' AND blog_comments.blogid = blg.id) AS `commentcount` 
FROM `blogs` AS `blg` 
INNER JOIN `blog_category` AS `cat` ON blg.category = cat.id 
INNER JOIN `members_member` AS `mem` ON blg.user = mem.id 
LEFT JOIN `blog_comments` AS `cmt` ON blg.id = cmt.blogid 
WHERE (blg.status = '1') 
GROUP BY `blg`.`id` 
ORDER BY `blg`.`id` ASC