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Locking in JPA

that has to be updated or deleted is checked. An exception is thrown if it is found out that an update ... deleted, and compares the version number of that object in the database to the version number

SELECT clause (JPQL / Criteria API)

objects, transparent update detection, support for delete, etc. Query results are not limited to entity ... efficiently. They are less productive with operations that update or delete entity objects, in

Database Management Settings

="128mb" /> When enabled, a recovery file is created by ObjectDB when a database is opened and deleted ... (usually in tests). The content of these temporary databases is deleted when using the drop URL

Database Connection using JPA

server mode. drop - for deleting any existing database content (useful for tests). To connect ... (properties); EntityTransaction Operations that affect the content of the database (store, update, delete

Chapter 1 - Quick Tour

ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete ... , retrieving, updating and deleting Point objects. To run the sample program of this chapter in

ObjectDB 2.8 Developer's Guide

, retrieve, update and delete database objects. Explains how to use the JPA Query Language (JPQL). Presents

JPA Lifecycle Events

the EntityManager. @PostRemove - after deleting an entity from the database (during commit or flush). An entity


() Deletes all the instances of the candidate class that pass the filter. Deletes all the instances ... that were deleted, specifically not including the number of dependent and embedded instances. Dirty ... cycle changes as if deletePersistent were called on them. Specifically, if the class of deleted


statement, e.g., for update or delete. Create an instance of Query for executing a native SQL statement, e.g., for update or delete. Parameters: sqlString - a native SQL query string Returns: the new ... ) Delete the persistent instance from the data store. Delete the persistent instance from the data

ObjectDB 1.0 Manual

and delete database objects. Chapter 7 - JDOQL Queries Describes JDOQL, the JDO Query Language. The last

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

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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