Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.
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JPA 2 supports both optimistic locking and pessimistic locking. Locking is essential to avoid ... separately. Optimistic locking is applied on transaction commit. Any database object ... by another transaction. When using ObjectDB, optimistic locking is enabled by default and fully
Method javax.jdo.Transaction void setOptimistic( boolean optimistic ) Optimistic transactions do not hold data store locks until commit time. If an implementation does not support this option, a JDOUnsupportedOptionException is thrown. Parameters: optimistic - the value of the Optimistic flag. Since: JDO 1.0
Static Field javax.jdo.Constants String PMF_ATTRIBUTE_OPTIMISTIC The name of the persistence manager factory element's "optimistic" attribute. Since: JDO 2.1
Enum Constant javax.persistence.LockModeType OPTIMISTIC_FORCE_INCREMENT Optimistic lock, with version update. Since: JPA 2.0
Enum Constant javax.persistence.LockModeType OPTIMISTIC Optimistic lock. Since: JPA 2.0
Static Field javax.jdo.Constants String OPTION_OPTIMISTIC "javax.jdo.option.Optimistic" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
Static Field javax.jdo.Constants String PROPERTY_OPTIMISTIC "javax.jdo.option.Optimistic" Since: JDO 2.1 See Also: PersistenceManagerFactory.getOptimistic()
.option.Optimistic", "false"); properties.setProperty( "javax.jdo.option.NontransactionalRead ... another type of transaction called optimistic transactions. When using optimistic transactions, objects ... succeeds while the second fails, throws an exception, and is rolled back automatically. Optimistic
Describes advanced JPA topics - detached entity objects, lock management and entity lifecycle events.
We are having problems with optimistic locking. 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 display the same data ... not get an optimistic lock exception, so the database has user 2’s change. Do you have a simple test