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Manual
19

Updating JPA Entity Objects

.getTransaction().begin(); employee.setNickname("Joe the Plumber"); em.getTransaction().commit(); The entity object is physically updated in the database when the transaction is committed. If the transaction is rolled back and not committed the update is discarded. On commit the persist operation
Manual
16

Setting and Tuning of JPA Queries

em can be visible to anyone who uses em, even before committing the transaction (but not to users ... , which has two values: AUTO - changes are flushed before query execution and on commit/flush. COMMIT - changes are flushed only on explicit commit/flush. In most JPA implementations the default is AUTO. In
Manual
16

Locking in JPA [2011-04-30]

separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed ... must be revealed earlier (before transaction commit) pessimistic locking can be used. When using
Manual
16

Locking in JPA

separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed ... must be revealed earlier (before transaction commit) pessimistic locking can be used. When using
Manual
14

Database Connection using JPA

that modify the database should come here. em.getTransaction().commit(); } finally ... (); } A transaction is started by a call to begin and ended by a call to either commit or rollback. All the operations ... with a commit propagates all the modifications physically to the database. If for any reason a commit
Manual
14

Database Connection using JPA [2011-08-30]

that modify the database should come here. em.getTransaction().commit(); } finally ... (); } A transaction is started by a call to begin and ended by a call to either commit or rollback. All the operations ... with a commit propagates all the modifications physically to the database. If for any reason a commit
Manual
12

Auto Generated Values [2011-02-11]

id; : } During a commit the AUTO strategy uses the global number generator to generate ... also generates an automatic value during commit for every new entity object. The difference is that a separate ... is persisted (i.e. before commit). This may be useful when the primary key value is needed earlier
Manual
12

Deleting JPA Entity Objects

); em.getTransaction().begin(); em.remove(employee); em.getTransaction().commit(); The entity object is physically deleted from the database when the transaction is committed. Embedded ... back and not committed the object is not deleted. An IllegalArgumentException is thrown by remove
Manual
12

Working with JPA Entity Objects [2011-04-18]

via an EntityManager’s persist method, which must be invoked within an active transaction. On transaction commit ... commit.  See the Updating Entities section for more information about making changes to entities ... Managed to Removed, and is physically deleted from the database during commit. More details on object
Manual
12

JPA Lifecycle Events

(added to the EntityManager). @PostPersist - after storing a new entity in the database (during commit or ... the database (during commit or flush). @PreRemove - when an entity is marked for removal in the EntityManager. @PostRemove - after deleting an entity from the database (during commit or flush). An entity