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About PESSIMISTIC_WRITE

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Manual
243

Locking in JPA

supported pessimistic lock modes are: PESSIMISTIC_READ - which represents a shared lock. PESSIMISTIC_WRITE ... explicitly by the lock method: em.lock(employee, LockModeType.PESSIMISTIC_WRITE); The first ... another EntityManager instance) currently holds a PESSIMISTIC_WRITE lock on that database object. A PESSIMISTIC
JPA Doc
116

LockModeType.PESSIMISTIC_WRITE

Enum Constant javax.persistence.LockModeType PESSIMISTIC_WRITE Pessimistic write lock. Since: JPA 2.0
Manual
46

Setting and Tuning of JPA Queries

execution sets a pessimistic WRITE lock on all the result objects:   List results = query.setLockMode(LockModeType.PESSIMISTIC_WRITE) .getResultList(); Notice that when a query ... . JPA 2 adds support for pessimistic locking. The setLockMode method sets a lock mode
JPA Doc
36

LockModeType.PESSIMISTIC_FORCE_INCREMENT

Enum Constant javax.persistence.LockModeType PESSIMISTIC_FORCE_INCREMENT Pessimistic write lock, with version update. Since: JPA 2.0
Result
36

ObjectDB Object Database Features

). Implicit pessimistic locking (JDO). Explicit pessimistic locking (JPA 2). Always Object Level locking. Lock modes: READ/WRITE, OPTIMISTIC/PESSIMISTIC. Database Tools and Utilities ObjectDB provides ... using a recovery file and double writing. Additional recovery layer - supports full transaction
JPA Doc
31

LockModeType.PESSIMISTIC_READ

Enum Constant javax.persistence.LockModeType PESSIMISTIC_READ Pessimistic read lock. Since: JPA 2.0
JPA Doc
29

javax.persistence.LockModeType

.PESSIMISTIC_WRITE, and LockModeType.PESSIMISTIC_FORCE_INCREMENT are used to immediately obtain long ... , LockModeType.PESSIMISTIC_WRITE, and LockModeType.PESSIMISTIC_FORCE_INCREMENT are the following. If transaction T1 calls for a lock of type LockModeType.PESSIMISTIC_READ or LockModeType.PESSIMISTIC_WRITE
JDO Doc
27

PersistenceCapable.CHECK_WRITE

Static Field javax.jdo.spi.PersistenceCapable byte CHECK_WRITE If jdoFieldFlags for a field includes CHECK_WRITE, then the field has been enhanced to call the jdoStateManager on write if the jdoFlags setting is not READ_WRITE_OK;. Since: JDO 1.0
JDO Doc
26

PersistenceCapable.MEDIATE_WRITE

Static Field javax.jdo.spi.PersistenceCapable byte MEDIATE_WRITE If jdoFieldFlags for a field includes MEDIATE_WRITE, then the field has been enhanced to always call the jdoStateManager on all writes. Since: JDO 1.0
JDO Doc
26

PersistenceCapable.READ_WRITE_OK

Static Field javax.jdo.spi.PersistenceCapable byte READ_WRITE_OK If jdoFlags is set to READ_WRITE_OK, then the fields in the default fetch group can be accessed for read or write without notifying the StateManager. Since: JDO 1.0