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Need disk usage and delete some old files

Hello , is it possible to get disk usage of database ? If disk usage becomes too high , delete old date files from database. And recalculate disk usage back ? kadirbasol Kadir BASOL Since an ObjectDB ... "Need disk usage and delete some old files" and should be focus only on that subject. support Support

How to delete M2M relationship?

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

Unexpected query token 'delete' (SELECT is expected) (error 752)

simple codes(see attachment), failed. gzdillon Lai Yang DELETE queries should not be run with getSingleResult (which is for SELECT queries). Use executeUpdate instead. See this manual page. support Support

delete of a collection in explorer changes type

accidently we used the option delete on a collection of type ArrayList<ObjectNode>. On doing so the type changed to List<ObjectNode>. we are using explorer version 2.7.1_02 How can we change that back again ? hgzwicker Hans-Georg Zwicker Is it only an issue with the type of the field as shown by

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

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

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

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

[ODB1] Chapter 3 - Persistent Classes

jdoPreDelete() Called during the execution of deletePersistent(...), just before an object is deleted. A possible action is to delete depended persistent objects as demonstrated ... .deletePersistent(p1); pm.deletePersistent(p2); } } When a Line instance is deleted

[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

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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