Question

我使用mySQL作为数据库进行Doctrine查询设置：

  $q = Doctrine_Query::create();
    $q->select('make.id, make.make, 
    model.id, model.year, model.model')
      ->from('Make make')
      ->innerJoin('make.Models model');     
    $q->groupBy('make.id, model.id');    // <-- this is where the problem
    $q->orderBy('make ASC');
    $q->setHydrationMode(Doctrine_Core::HYDRATE_SCALAR);
    $pager = new Doctrine_Pager($q, 1, 1);  // just want one result to prove the concept
    $items = $pager->execute();

执行这三个查询（来自mysql日志）：

SELECT COUNT（*）AS num_results FROM（SELECT m。id FROM make m INNER JOIN model {{1} } ON m2。m = id。m2 GROUP BY make_id。m，id。m2 ）id

SELECT DISTINCT dctrn_count_query。m3 FROM id make内部加入m3 model ON m4。{{1} } = m3。id GROUP BY m4。make_id，m3。id ORDER BY m4。{{1} } ASC LIMIT 1

选择id。m3 AS make，m。id AS m__id，m。{{1} } AS make，m__make。m2 AS id，m2__id。m2 AS year FROM m2__year { {1}} INNER JOIN m2 model ON m2__model。make = m。model WHERE m2。{{1 } IN（'33'）GROUP BY m。id，m2。make_id ORDER BY m。id ASC

结果集是

问题在于第二个查询返回make.id，在第三个查询中用于选择1 make（Alfa-Romeo有3个模型）。我想要的是返回NUMBER OF品牌/型号组合。

如果我将Doctrine_Pager中返回的项目数量更改为2，我会得到33行（因为两个选定的产品使得Alfa-Romeo有3个型号而奥迪（下一个）有30个型号。

我在哪里弄错了？

Answer 1

您不能将多个列组合在一个组中。试试这个......

$q->groupBy('make.id');
$q->addGroupBy('model.id');

或稍微压缩......

$q->groupBy('make.id')->addGroupBy('model.id');

Answer 2

$table->setAttribute(Doctrine_Core::ATTR_QUERY_LIMIT, Doctrine_Core::LIMIT_ROWS);

http://www.doctrine-project.org/projects/orm/1.2/docs/manual/dql-doctrine-query-language/en

Doctrine_Pager使用多个groupBy列返回错误的结果

2 个答案: