Fast Object Database for Java - with JPA/JDO support

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21

Deleting a broken reference that was fixed to null in the Explorer

Using version 2.7.4_01, we did a repair. After repair a former link to a missing reference was converted to null. This cannot be deleted using explorer hgzwicker Hans-Georg Zwicker Thank you for this report. Build 2.7.4_02 fixes the issue. support Support
21

How to delete M2M relationship?

.ALL)     private Set timeslots = new HashSet(); And i would like to delete the timeslots..i've tried
21

cannot delete objects after crash (see issue 2283)

after the crash we cannot delete specific objects, see screenshots of explorer. Database will be soon available (size 5.561.119 KB) on hummingbird-systems.com, user/pw your db name, main menu option objectdb hgzwicker Hans-Georg Zwicker meanwhile the database became completely unusable
20

E-delete.png

E-delete.png
20

Database Explorer

that has to be set. The functionality of the Edit > Delete command depends on the context. Deleting a reference field sets the value to null without deleting any referenced entity object. On the other hand, deleting an entity object that is represented by a child of an Extent node in a viewer window
20

Server User List

" ip="127.0.0.1" admin="true">
18

Working with JPA Entity Objects

requires using entity objects for many operations, including storing, retrieving, updating and deleting ... . A managed entity object can also be retrieved from the database and marked for deletion, using ... to Removed, and is physically deleted from the database during commit. More details on object
16

[ODB1] Chapter 3 - Persistent Classes

during the execution of deletePersistent(...), just before an object is deleted. A possible action is to delete depended persistent objects as demonstrated below. Because the four events are defined ... ); pm.deletePersistent(p2); } } When a Line instance is deleted, the two referred Point
14

[ODB1] Chapter 5 - JDO Connections

storing, retrieving, updating and deleting database objects, are provided in the next chapter (Chapter ... , delete) must always be performed within an active transaction. On the other hand, reading from ... $. After the transaction is completed the temporary file is marked as obsolete (and for efficiency, it is deleted
14

JPA Query Structure (JPQL / Criteria)

(update and delete queries have a slightly different form). The other JPQL clauses, WHERE, GROUP BY, HAVING and ORDER BY are optional. The structure of JPQL DELETE and UPDATE queries is simpler: DELETE

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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