About entities

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JPA Doc
63

refresh(entity, lockMode, properties)

Method javax.persistence.EntityManager void refresh(   Object entity,   LockModeType lockMode ... changes made to the entity, if any, and lock it with respect to given lock mode type and with specified properties. If the lock mode type is pessimistic and the entity instance is found
JPA Doc
63

refresh(entity, properties)

Method javax.persistence.EntityManager void refresh(   Object entity,   Mapentity, if any. If a vendor-specific property or hint is not recognized, it is silently ignored. Parameters: entity - entity instance properties - standard and vendor
JPA Doc
62

getIdentifier(entity)

Method javax.persistence.PersistenceUnitUtil Object getIdentifier(   Object entity ) Return the id of the entity. A generated id is not guaranteed to be available until after the database insert has occurred. Returns null if the entity does not yet have an id. Parameters: entity - entity instance
JPA Doc
62

isLoaded(entity)

Method javax.persistence.PersistenceUnitUtil boolean isLoaded(   Object entity ) Determine the load state of an entity belonging to the persistence unit. This method can be used to determine the load state of an entity passed as a reference. An entity is considered loaded if all attributes
JPA Doc
62

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
JPA Doc
62

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
JPA Doc
62

remove(entity)

Method javax.persistence.EntityManager void remove(   Object entity ) Remove the entity instance. Parameters: entity - entity instance Throws: IllegalArgumentException - if the instance is not an entity or is a detached entity TransactionRequiredException - if invoked on a container-managed entity
JPA Doc
62

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
JPA Doc
62

entity(cls)

Method javax.persistence.metamodel.Metamodel EntityType entity(   Class cls ) Return the metamodel entity type representing the entity. Parameters: cls - the type of the represented entity Returns: the metamodel entity type Throws: IllegalArgumentException - if not an entity Since: JPA 2.0
JPA Doc
62

from(entity)

Method javax.persistence.criteria.AbstractQuery Root from(   EntityType entity ) Create and add a query root corresponding to the given entity, forming a cartesian product with any existing roots. Parameters: entity - metamodel entity representing the entity of type X Returns: query root corresponding to the given entity Since: JPA 2.0