问题描述
我在学说的文档中阅读了有关水合作用的内容，但我仍然无法理解它是什么.
I've read about hydration in doctrine's documentation but I still can't understand what it is.
谁能解释一下?
推荐答案
Hydration是一种用于返回查询结果的方法.例如:
Hydration is a method used to return query results. For example:
HYDRATE_ARRAY- 这将返回一个由另一个数组表示的记录数组:
HYDRATE_ARRAY- This will return you an array of records that are represented by another array:
$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'];
}
HYDRATE_RECORD - 这将返回一个集合(Doctrine_Collection) 对象:
HYDRATE_RECORD - This will return you an collection (Doctrine_Collection) of objects:
$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();
}
HYDRATE_SINGULAR_SCALAR - 将返回查询结果第一列的值:
HYDRATE_SINGULAR_SCALAR - Will return the value of first column of query's result:
$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)
还有更多方法，您可以在文档中阅读每个方法.
There is a few more methods , you can read about each in documentation.
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