interface EntityStorageSchemaInterface in Drupal 8

Defines the interface for entity storage schema handler classes.

An entity type's storage schema handler is responsible for creating the storage backend's schema that the entity type's storage handler needs for storing its entities. For example, if the storage handler is for a SQL backend, then the storage schema handler is responsible for creating the needed tables. During the application lifetime, an entity type's definition can change in a way that requires changes to the storage schema, so this interface defines methods for that as well.

Hierarchy

• interface \Drupal\Core\Entity\EntityTypeListenerInterface
  • interface \Drupal\Core\Entity\Schema\EntityStorageSchemaInterface

See also

\Drupal\Core\Entity\EntityStorageInterface

1 file declares its use of EntityStorageSchemaInterface

EntityDefinitionUpdateManager.php in core/lib/Drupal/Core/Entity/EntityDefinitionUpdateManager.php

File

core/lib/Drupal/Core/Entity/Schema/EntityStorageSchemaInterface.php, line 21

Namespace

Drupal\Core\Entity\Schema

interface EntityStorageSchemaInterface extends EntityTypeListenerInterface {

  /**
   * Checks if the changes to the entity type requires storage schema changes.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The updated entity type definition.
   * @param \Drupal\Core\Entity\EntityTypeInterface $original
   *   The original entity type definition.
   *
   * @return bool
   *   TRUE if storage schema changes are required, FALSE otherwise.
   */
  public function requiresEntityStorageSchemaChanges(EntityTypeInterface $entity_type, EntityTypeInterface $original);

  /**
   * Checks if existing data would be lost if the schema changes were applied.
   *
   * If there are no schema changes needed, then no data needs to be migrated,
   * but it is not the responsibility of this function to recheck what
   * requiresEntityStorageSchemaChanges() checks. Rather, the meaning of what
   * this function returns when requiresEntityStorageSchemaChanges() returns
   * FALSE is undefined. Callers are expected to only call this function when
   * requiresEntityStorageSchemaChanges() is TRUE.
   *
   * This function can return FALSE if any of these conditions apply:
   * - There are no existing entities for the entity type.
   * - There are existing entities, but the schema changes can be applied
   *   without losing their data (e.g., if the schema changes can be performed
   *   by altering tables rather than dropping and recreating them).
   * - The only entity data that would be lost are ones that are not valid for
   *   the new definition (e.g., if changing an entity type from revisionable
   *   to non-revisionable, then it's okay to drop data for the non-default
   *   revision).
   *
   * When this function returns FALSE, site administrators will be unable to
   * perform an automated update, and will instead need to perform a site
   * migration or invoke some custom update process.
   *
   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
   *   The updated entity type definition.
   * @param \Drupal\Core\Entity\EntityTypeInterface $original
   *   The original entity type definition.
   *
   * @return bool
   *   TRUE if data migration is required, FALSE otherwise.
   *
   * @see self::requiresEntityStorageSchemaChanges()
   */
  public function requiresEntityDataMigration(EntityTypeInterface $entity_type, EntityTypeInterface $original);

}

Members

Name	Modifiers	Type	Description	Overrides
EntityStorageSchemaInterface::requiresEntityDataMigration	public	function	Checks if existing data would be lost if the schema changes were applied.	2
EntityStorageSchemaInterface::requiresEntityStorageSchemaChanges	public	function	Checks if the changes to the entity type requires storage schema changes.	2
EntityTypeListenerInterface::onEntityTypeCreate	public	function	Reacts to the creation of the entity type.	4
EntityTypeListenerInterface::onEntityTypeDelete	public	function	Reacts to the deletion of the entity type.	4
EntityTypeListenerInterface::onEntityTypeUpdate	public	function	Reacts to the update of the entity type.	4
EntityTypeListenerInterface::onFieldableEntityTypeCreate	public	function	Reacts to the creation of the fieldable entity type.	4
EntityTypeListenerInterface::onFieldableEntityTypeUpdate	public	function	Reacts to the update of a fieldable entity type.	4