ZF2表网关连接查询从第二个表

Question

嗨只获取最新的行（通过ID），我需要一个ZF2加入第二个表查询（按id DESC）获取只有最后一排。我写了一个SQL查询，它的工作原理。

SELECT st1.customer_id, 
    st1.id 
    FROM status st1 
    inner JOIN 
    (
    SELECT max(id) MaxId, customer_id 
    FROM status 
    GROUP BY customer_id 
) st2 
    ON st1.customer_id = st2.customer_id 
    AND st1.id = st2.MaxId 

但我需要在zend框架2表格网关格式这个查询。请帮忙。

Answer 1

use Zend\Db\Sql\Select; 
    use Zend\Db\Sql\Expression; 

    $sql = new Select(); 
    $sql->columns(["customer_id", new Expression ("max(id) AS MaxId")]) 
     ->from ('status') 
     ->group('customer_id'); 

    $outer = new Select(); 
    $outer->columns (['customer_id', 'id']) 
     ->from (['st1' => 'status']) 
     ->join (['st2' => $sql], 
      'st1.customer_id = st2.customer_id AND st1.id = st2.MaxId', []);