46 | getReference(entityClass, primaryKey)Method javax.persistence.EntityManager T getReference( Class<T> entityClass, Object primaryKey ) Get an instance, whose state may be lazily fetched. If the requested instance does not exist in the database, the EntityNotFoundException is thrown when the instance state is first accessed |
46 | contains(entity)Method javax.persistence.EntityManager boolean contains( Object entity ) Check if the instance is a managed entity instance belonging to the current persistence context. Parameters: entity - entity instance Returns: boolean indicating if entity is in persistence context Throws: IllegalArgumentException - if not an entity Since: JPA 1.0 |
46 | find(entityClass, primaryKey, lockMode)Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode ) Find by primary key and lock. Search for an entity of the specified class and primary key and lock it with respect to the specified lock type. If the entity instance is contained in |
46 | refresh(entity)Method javax.persistence.EntityManager void refresh( Object entity ) Refresh the state of the instance from the database, overwriting changes made to the entity, if any. Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or the entity is not |
46 | find(entityClass, primaryKey)Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey ) Find by primary key. Search for an entity of the specified class and primary key. If the entity instance is contained in the persistence context, it is returned from there. Parameters: entityClass - entity |
46 | persist(entity)Method javax.persistence.EntityManager void persist( Object entity ) Make an instance managed and persistent. Parameters: entity - entity instance Throws: EntityExistsException - if the entity already exists. (If the entity already exists, the EntityExistsException may be thrown when the persist |
46 | clear()Method javax.persistence.EntityManager void clear() Clear the persistence context, causing all managed entities to become detached. Changes made to entities that have not been flushed to the database will not be persisted. Since: JPA 1.0 |
46 | find(entityClass, primaryKey, lockMode, properties)Method javax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode, Map<K,V> properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect to the specified |
46 | merge(entity)Method javax.persistence.EntityManager T merge( T entity ) Merge the state of the given entity into the current persistence context. Parameters: entity - entity instance Returns: the managed instance that the state was merged to Throws: IllegalArgumentException - if instance is not an entity or |
4 | find(entityClass, primaryKey, lockMode, properties)Methodjavax.persistence.EntityManager T find( Class<T> entityClass, Object primaryKey, LockModeType lockMode, Map<K,V> properties ) Find by primary key and lock, using the specified properties. Search for an entity of the specified class and primary key and lock it with respect to the specified |
