mysql - Symfony Propel criteria

Question

Is there any possible way to convert the MySQL object into criteria object? I tried this query:

select 
  p.disrepid, 
  p.subject, p.body, 
  c.disrepid as disrepid1, 
  c.subject as subject1, 
  c.body as body1 
from discusreply as p, discusreply as c 
where p.distopid=' . $this->id . ' 
  and (c.disrepid = p.parentid or c.parentid = p.distopid) 
order by p.disrepid ASC

I tried a lot for converting this query into a Criteria, But nothing happened. I want this criteria object for passing this into Pager class for completing the pagination. $pager->setCriteria($c);.

Answer 1

您可以使用自己的 SQL 执行查询，但没有自动方式将 sql 转换为 Criteria 对象。

$con = Propel::getConnection(DATABASE_NAME);
$sql = "SELECT books.* FROM books 
    WHERE NOT EXISTS (SELECT id FROM review WHERE book_id = book.id)";
$stmt = $con->createStatement();
$rs = $stmt->executeQuery($sql, ResultSet::FETCHMODE_NUM);
$books = BookPeer::populateObjects($rs);

这会一起绕过 Criterion 对象。您提到想要一个标准对象，以便您可以将其输入寻呼机。您可以改为在寻呼机中设置自定义选择方法，然后该寻呼机将执行您的自定义查询。如果您需要向其中传递参数，我建议使用您自己的寻呼机类扩展 sfPropel，该类可以选择将参数传递给您的对等选择方法，因此您根本不必使用 Criteria 对象。作为一种快速的替代方法，您可以执行以下操作，将您的 Criteria 用作您选择参数的容器：

$c = new Criteria();
$c->add(DiscussreplyPeer::ID, $myId);
$pager = new sfPropelPager();
$pager->setCriteria($c);
$pager->setPeerMethod('getReplies');

然后在你的同龄人中：

public static function getReplies(Criteria $c) {
    $map = $c->getMap();
    $replyId = $map[DiscussreplyPeer::ID]->getValue();

    $con = Propel::getConnection(DATABASE_NAME);
    $sql = "select p.disrepid, p.subject, p.body, c.disrepid as disrepid1, c.subject as subject1, c.body as body1 from discusreply as p, discusreply as c where p.distopid=? and (c.disrepid = p.parentid or c.parentid = p.distopid) order by p.disrepid ASC";

    $stmt = $con->prepareStatement($sql);
    $stmt->setString(1, $replyId);

    $rs = $stmt->executeQuery();

    $results = array();
    while ($rs->next()) {
      // for example
        $results['disrepid'] = $rs->getInt('disrepid');
    }

    return $results;
}

有关推进和 symfony 的更多提示可以在以下位置找到： http ://stereointeractive.com/blog/2007/06/12/propel-queries-using-custom-sql-peer-classes-and-criterion-objects/

Answer 2

该站点对学习编写标准有很大帮助——您可以使用它从伪 SQL 生成标准代码。我还建议获取Symfony/Propel 备忘单。

特别是对于您的查询，您将需要以下内容：

$c = new Criteria();
$c->addJoin(discusreply::DISREPID, discusreply::PARENTID, Criteria::INNER_JOIN);  
$c->clearSelectColumns();
$c->addSelectColumn(discusreplyPeer::Disrepid); 
...
$c->add(discusreplyPeer::DISTOPID, $this->id, Criteria::EQUAL);
... 
$c->addAscendingOrderByColumn(discusreply::DISREPID);

我不确定 Criteria 系统是否支持内部连接的多个子句，因此您可能必须为此查询恢复到 ad-hoc SQL（如果可以的话，我很想知道如何）。以下代码将创建一个 ResultSet 对象，类似于您从简单的数据库抽象层中获得的对象。

$sql = "SELECT ...";
$dbh = Propel::getConnection([DB]);
$sth = $dbh->createStatement();
$res = $sth->executeQuery($sql, ResultSet::FETCHMODE_NUM);

我认为在这样的查询上使用 ad-hoc 方法没有什么缺点，因为当您只返回特定列时，您将不得不处理 ResultSet 对象而不是特定于表的对象。

Answer 3

您可以尝试使用此站点从 sql 自动生成条件。