Doctrine2迭代

Question

我在表单上有<select>的以下代码。

$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");`
$groups = $query->iterate();`
$groups_option = "";
foreach( $groups as $row ){
    $group = $row[0];
    $groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
}

但这会引发错误。有效的是......

$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();

$groups_option = "";
$i = 0;
foreach( $groups as $row ){
    $group = $row[$i];
    $groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
    $i++;
}

我做错了吗？参考手册引用第一个选项为正确...

Answer 1

我找到了自己问题的答案：

虽然DQL允许SELECT g.id, g.name而不会抛出错误，但这实际上是SQL，而不是DQL。 （谢谢，学说参考手册，因为这个很清楚...）

正确的编码方式是

$query = $em->createQuery("SELECT partial g.{id,name} FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();

$groups_option = "";
foreach( $groups as $group ){
$group = $group[0];
$groups_option .= "<option value=\"{$group->id}\">{$group->name}</option>\n";

}

Answer 2

您的变量名称不匹配。

删除$group = $row[0]并使用foreach ($groups as $group)

$query = $em->createQuery("SELECT g.name, g.id FROM SSMURBS\Group g ORDER BY g.name ASC");
$groups = $query->iterate();
$groups_option = "";
foreach ( $groups as $group ){
    $groups_option .= "<option val=\"{$group['id']}\">{$group['name']}</option>\n";
}