什么是学说水合?
我已经阅读了关于学说的文献中的保湿,但我仍然不明白是什么。
有人可以解释吗?
水合是一种用来返回查询结果的方法。 例如:
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HYDRATE_ARRAY
– 这将返回一个由另一个数组表示的logging数组:$q = Doctrine_Query::create() ->from('Post p') ->setHydrationMode(Doctrine::HYDRATE_ARRAY); $resultSet = $q->execute(); // $resultSet is an array foreach ($resultSet as $post) { // $post is an array echo $post['title']; }
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HYDRATE_RECORD
– 这将返回一个对象的集合( Doctrine_Collection ):$q = Doctrine_Query::create() ->from('Post p') ->setHydrationMode(Doctrine::HYDRATE_RECORD); // Unnecessary, HYDATE_RECORD is default method $resultSet = $q->execute(); // $resultSet is an Doctrine_Collection object foreach ($resultSet as $post) { // $post is an Post object echo $post->getTitle(); echo $post['title']; // Each Doctrine's Model object implements ArrayAccess interface so this is possible echo $post->myCustomMethod(); }
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HYDRATE_SINGULAR_SCALAR
– 将返回查询结果第一列的值:$q = Doctrine_Query::create() ->select('p.created_at') ->from('Post p') ->where('p.id = ?', 321) ->setHydrationMode(Doctrine::HYDRATE_SINGULAR_SCALAR); $createdAt = $q->execute(); // $createdAt has value of first column from first record from result set (eg.: 2008-04-06 21:22:35)
还有几个方法,你可以在文档中阅读每个方法。
说明HYDRATION的Doctrine2文档参考: http : //www.doctrine-project.org/docs/orm/2.0/en/reference/dql-doctrine-query-language.html#query-result-formats
$q->fetchOne(array(), Doctrine_Core::HYDRATE_ARRAY); It will return just a simple array instead of a doctrine collection object.