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Friday, April 6, 2012
what is doctrine hydration?
I've read about hydration in doctrine's documentation but I still can't understand what it is.
$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 - Will return the value of first column of query's result:
Hydration is a method used to return query results. For example:
ReplyDeleteHYDRATE_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 - 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 - 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)
There is a few more methods , you can read about each in documentation.
Doctrine documentation reference explaining HYDRATION:
ReplyDeletehttp://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);
ReplyDeleteIs just used to return a simple array instead of a doctrine collection object.