About lock

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ObjectDB - Object Database for Java (JPA/JDO) [2017-10-19]

lock in - switching between implementations is easy. Technology flexibility - same API
Manual
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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
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What is new in ObjectDB 2.0?

optimistic locking support. Performance improvement in writing and reading of objects. Level 2
Manual
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Database Doctor

engine (not using one server process), thus bypassing ObjectDB internal file lock protection. Modifying
Manual
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Database Doctor [2011-04-03]

engine (not using one server process), thus bypassing ObjectDB internal file lock protection. Modifying
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10

ObjectDB - Object Database for Java (JPA/JDO)

) Using a standard Java API (JPA / JDO) provides many benefits, including: Avoiding vendor lock in
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10

ObjectDB - Object Database for Java (JPA/JDO) [2018-11-03]

) Using a standard Java API (JPA / JDO) provides many benefits, including: Avoiding vendor lock in
Manual
10

Chapter 3 - Using JPA

This chapter explains how to manage ObjectDB databases using the Java Persistence API (JPA). The first two pages introduce basic JPA interfaces and concepts: The next section explains how to use JPA for database CRUD operations: More advanced topics (e.g. locking and events) are discussed in the last section:
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ObjectDB - Object Database for Java (JPA/JDO) [2018-10-30]

) Using a standard Java API (JPA / JDO) provides many benefits, including: Avoiding vendor lock in
JPA Doc
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refresh(entity, lockMode)

, and lock it with respect to given lock mode type. 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-level rollback the LockTimeoutException will be thrown