Собственно тут описана основная разница между подходами ActiveRecord и DataMapper. Гидраторы можно впихнуть туда и туда, можно мэпить на любые структуры теоритически, но основное различие в том кто отвечает за сохранение данных.
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March 12, 2024 00:02
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Доступ к данным или как мы учились не замечать базу данных
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| <?php | |
| class User extends ActiveRecord { | |
| public $id; | |
| public $email; | |
| public $password; | |
| public $firstName; | |
| public $lastName; | |
| } | |
| /* maps all this on table: | |
| Table users | |
| ------------------------ | |
| | id | int | | |
| | email | string | | |
| | password | string | | |
| | first_name | string | | |
| | last_name | string | | |
| ------------------------ */ | |
| abstract class ActiveRecord { | |
| public function save() { | |
| if ($this->isNewRecord()) { | |
| $this->insert(); | |
| } else { | |
| $this->update(); | |
| } | |
| } | |
| public function update() { | |
| $this->db->update($this->tableName, $this->attrs, ['id' => $this->id]); | |
| } | |
| public function insert() { | |
| $this->db->insert($this->tableName, $this->attrs); | |
| } | |
| public function delete() { | |
| $this->db->insert($this->tableName, $this->attrs); | |
| } | |
| // ... | |
| } |
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| <?php | |
| class User { | |
| private $id; | |
| private $email; | |
| private $password; | |
| private $profile; | |
| public function __construct(string $email, string $password, UserProfile $profile) { | |
| $this->email = $email; | |
| $this->password = $password; | |
| $this->profile = $profile; | |
| } | |
| } | |
| class UserProfile { | |
| private $firstName; | |
| private $lastname; | |
| public function __construct(string $firstName, string $lastName) { | |
| $this->firstName = $firstName; | |
| $this->lastName = $lastName; | |
| } | |
| } | |
| /** Maps data to this table structure: | |
| * | |
| * ------------------------------ | |
| * id | int | | |
| * email | string | | |
| * password | string | | |
| * profile_first_name | string | | |
| * profile_last_name | string | | |
| */ | |
| class DataMapper { | |
| private $db, $hidrator; | |
| public function save(User $user) { | |
| $attributes = $this->hidrator->dehydrate($user); | |
| if ($this-isNewRecord($user)) { | |
| $this->db->setIdentity($user); // selects next sequence value as ID (only postgresq, oracle, mssql) | |
| $this-db->insert($this->getTableName($user), $attributes); | |
| } else { | |
| $this->db->update($this->getTableName($user), $attributes, $this->getFindByIdentityCriteria($user)); | |
| } | |
| } | |
| public function remove(User $user) { | |
| $this->db-delete($this->getTableName($user), $this->getIdentity($user)); | |
| } | |
| // ... | |
| } |
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