About EntityManager

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JPA Doc
54

lock(entity, lockMode)

Method javax.persistence.EntityManager void lock(   Object entity,   LockModeType lockMode ) Lock an entity instance that is contained in the persistence context with the specified lock mode type. If a pessimistic lock mode type is specified and the entity contains a version attribute
JPA Doc
54

lock(entity, lockMode, properties)

Method javax.persistence.EntityManager void lock(   Object entity,   LockModeType lockMode,   Map properties ) Lock an entity instance that is contained in the persistence context with the specified lock mode type and with specified properties. If a pessimistic lock mode type
JPA Doc
54

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
54

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
54

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
JPA Doc
54

refresh(entity, properties)

Method javax.persistence.EntityManager void refresh(   Object entity,   Map properties ) Refresh the state of the instance from the database, using the specified properties, and overwriting changes made to the entity, if any. If a vendor-specific property or hint is not recognized
JPA Doc
54

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
54

setFlushMode(flushMode)

Method javax.persistence.EntityManager void setFlushMode(   FlushModeType flushMode ) Set the flush mode that applies to all objects contained in the persistence context. Parameters: flushMode - flush mode Since: JPA 1.0
JPA Doc
54

setProperty(propertyName, value)

Method javax.persistence.EntityManager void setProperty(   String propertyName,   Object value ) Set an entity manager property or hint. If a vendor-specific property or hint is not recognized, it is silently ignored. Parameters: propertyName - name of property or hint value - value for property or
JDO Doc
54

find(entityClass, primaryKey, lockMode, properties)

Methodjavax.persistence.EntityManager T find(   Class entityClass,   Object primaryKey,   LockModeType lockMode,   Map 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