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Manual
45

Chapter 3 - Using JPA

Explains how to store, retrieve, update and delete entity objects using JPA.
Manual
45

CRUD Operations with JPA

Explains how to use JPA for CRUD database operations (persist, retrieve, update, remove).
Result
45

What is new in ObjectDB 2.0?

All about What is new in ObjectDB 2.0? in Java/JPA database - explanations, examples, references, links and related information.
Manual
25

Locking in JPA

update collisions resulting from simultaneous updates to the same data by two concurrent users. Locking ... that has to be updated or deleted is checked. An exception is thrown if it is found out that an update is being performed on an old version of a database object, for which another update has already been committed
Manual
22

Running JPA Queries

other case. In addition, the Query interface defines a method for running DELETE and UPDATE queries: Query.executeUpdate - for running only DELETE and UPDATE queries. Ordinary Query Execution ... and UPDATE Query Execution (with executeUpdate) DELETE and UPDATE queries are executed using
Forum
21

Updating Entities

with Entities not sending their updates to each other. I have two Entities in question at the moment ... . However, once a change has been made to paygradeDB after this visual load - the Employee table refuses to update ... validation checks and queries apart from UI function handlers. I also know that my code handles updating
Manual
20

Database Management Settings

" synchronized="false" />    update enabled="true" priority="40" /> update> element    update enabled="true" priority="40" /> The update> element specifies how new defined
Issue
18

JQL-Update Queries fails with activated L2-Cache

When using JQL- Update Queries it is basically not working without calling entityManager.clear ... a container the updated Entities. Scenario 1: Disabled L2 Cache, updating elements using UPDATE-Query ... database - Actual result: No changes are visble. Scenario 2: Disabled L2 Cache, updating elements using
Manual
18

Storing JPA Entity Objects

too much memory. The sample code above clears the persistence context after every 10,000 persists. Updates are flushed to the database before clearing, otherwise they would be lost. Updates that are sent ... until a commit. With no explicit commit, these updates are later discarded. The combination of clear
Forum
18

ClassCastException on SELECT NEW ... after UPDATE over Java RMI

NEW ...) and UPDATE JPQL queries on the DB via the RMI interface. What we noticed is that once we UPDATE a record from the client (via the RMI interface), all SELECT NEW ... queries ... via RMI after the update. For example SELECT COUNT(*) ..., or SELECT r FROM ... all work fine.   DB