我在学说的文档中读到过水合作用,但我仍然无法理解它是什么。
有人可以解释一下吗?
答案 0 :(得分:90)
水合作用是一种用于返回查询结果的方法。例如:
HYDRATE_ARRAY
- 这将返回一个由另一个数组表示的记录数组:
$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'];
}
HYDRATE_RECORD
- 这会返回一个对象集合(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();
}
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)
还有一些方法,您可以在文档中阅读每个方法。
答案 1 :(得分:3)
$q->fetchOne(array(), Doctrine_Core::HYDRATE_ARRAY);
It will return just a simple array instead of a doctrine collection object.