About lock

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JPA Doc
17

find(entityClass, primaryKey, lockMode, properties)

,   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 to the specified lock type. If the entity instance is contained in the persistence context, it is returned from
JPA Doc
17

find(entityClass, primaryKey, lockMode, properties)

,   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 to the specified lock type. If the entity instance is contained in the persistence context
JDO Doc
17

find(entityClass, primaryKey, lockMode, properties)

,   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 to the specified lock type. If the entity instance is contained in the persistence context, it is returned from
JPA Doc
15

javax.persistence.Query

lock mode for the query. Get the current lock mode for the query. Returns: lock mode Throws ... - if a lock mode has been set and there is no transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking
JPA Doc
15

refresh(entity, lockMode, properties)

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 but cannot be locked: the PessimisticLockException will be thrown if the database locking failure causes transaction
Manual
14

Database Doctor

engine (not using one server process), thus bypassing ObjectDB internal file lock protection. Modifying
Manual
14

Detached Entity Objects

Detached entity objects are objects in a special state in which they are not managed by any EntityManager but still represent objects in the database. Compared to managed entity objects, detached objects are limited in functionality: Many JPA methods do not accept detached objects (e.g. lock
Result
14

About ObjectDB Database

ObjectDB Object Database ObjectDB is a powerful Object-Oriented Database Management System (ODBMS). It is compact, reliable, easy to use and extremely fast. ObjectDB provides all the standard database management services (storage and retrieval, transactions, lock management, query processing
Result
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What is new in ObjectDB 2.0?

optimistic locking support. Performance improvement in writing and reading of objects. Level 2
FAQ
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What is ObjectDB?

ObjectDB is an Object Oriented Database Management System (ODBMS). It provides all the standard database management services (storage and retrieval, transactions, lock management, query processing, etc.), but it uses an object oriented model to store and manage data. You can easily store ordinary