About lock
Locking in JPA
Explains how to use optimistic locking and pessimistic locking in JPA.... database objects are locked during the transaction and lock conflicts, if they happen, are detected earlier. This page ... Pessimistic Locking Other Explicit Lock Modes Locking during Retrieval ...
lock(entity, lockMode)
Lock an entity instance that is contained in the persistence context with the specified lock mode type.(Method of javax.persistence.EntityManager)
Setting and Tuning of JPA Queries
Explains various JPA query settings - result range, flush and lock.... Flush Mode (setFlushMode) Lock Mode (setLockMode) Query Hints Result ... is important, this issue has to be considered. Lock Mode (setLockMode) ObjectDB uses automatic optimistic locking ...
javax.persistence.EntityManager
Interface used to interact with the persistence context.(Interface of JPA)
Chapter 3 - Using JPA
Explains how to store, retrieve, update and delete entity objects 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: Database Connection using JPA Working with JPA Entity Objects ...
javax.persistence.LockModeType
Lock modes can be specified by means of passing a LockModeType argument to one of the javax.persistence.EntityManager methods that take locks (lock, find, or refresh) or to the Query.setLockMode() or TypedQuery.setLockMode() method.(Enum of JPA)
Advanced JPA Topics
Describes advanced JPA topics - detached entity objects, lock management and entity lifecycle events. This section discusses advanced JPA topics: Detached Entity Objects Locking in JPA JPA Lifecycle Events Shared (L2) Entity Cache JPA Metamodel API ...
Optimistic Locking
We are having problems with optimistic locking. I made a simple test case to try to induce an optimistic lock.... I made a simple test case to try to induce an optimistic lock. I have two users logged on to our system. They both read and ... user 2 and submit. User 2 does not get an optimistic lock exception, so the database has user 2’s change. Do you have a simple ...
Pessimistic Lock Timeouts setting
Hi, I realise that JPA2 doesn't necessarily define a standard API way for Lock Timeouts. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" ... JPA2 doesn't necessarily define a standard API way for Lock Timeouts. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" I have a situation where multiple threads can hit a ...
lock(entity, lockMode, properties)
Lock an entity instance that is contained in the persistence context with the specified lock mode type and with specified properties.(Method of javax.persistence.EntityManager)
