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drop a column from table

Hi, I want to drop one column from my database table suppose i have 3 column (id, name, address ... remove the field from the entity class. See Automatic Schema Evolution. Space in the database file ... removed only when an object is stored again, after removing the field from the entity class

java.lang.ClassCastException in OSGi runtime when loading data from DB

ClassCastExceptions on my "entity" classes when I try to read data from the DB. In a very old (2011?) forum ... <Person> typedQuery = entityManager.createQuery("SELECT FROM Person p WHERE p.id = 1", Person.class ... class is available from two different class loaders: A Person class that is specified in your query

Import data from MySQL

mysql data into objectdb? gzdillon Lai Yang Currently to import data from other databases to ObjectDB ... data from MySQL using JPA as entity objects, detach the retrieved entity objects and then persist ... its priority. See also the migration path from JPA / Hibernate forum thread. support Support

Help: After upgrading from 2.2.8_02 to 2.2.8_04, can't perform LIKE query

Hi, AFter the upgrade from 2.2.8_02 (not sure if it was build 03/04 as I skipped 03) - my LIKE queries have stopped working during a regression test. As an example output: Query: SELECT $1 FROM Company $1 WHERE ((($1.companyId LIKE :p1) AND ($1.conditionOne=true)) AND ((($1.conditionTwo=false

Changing from client server to embedded mode

Client Server mode. kindly provide information how to switch from client server mode to embedded ... of the database file (from the client-server session) on your computer (under objectdb/db), you can also use

"Rebuild Class Indexes" from the command line?

Hi, Is there a way to "Rebuild Class Indexes" from the command line? I have just added a new index and want to make sure the DBs with previously persisted entities have a BTree with all entities ... currently requires running the ObjectDB Doctor, which is run from the command line. ObjectDB 1.x

Changing existing objects from Entity to Embedded

Hi, I realised that I have a mistake (from application logic point of view) in one of my JDO metadata files: <jdo> <package name="my.example.package">     <class name="InnerSettings">    <field ... tried the migration and the explorer also from version 2.7.2_09 and it made no difference. jakab

Allow removal of entity class from ObjectDB & Explorer

Hi. It would be very useful to be able to delete an entire entity class from ObjectDB, but especially from Explorer. This is very useful for everyone, but also for clients that don't own a license ... / Managed Types list and then deleted by using [Edit > Delete] from the menu bar or right click (context menu) and Delete. support Support

Exception Failed to read from file

Hello, we have found several these exceptions in our log [ObjectDB 2.5.0_06] javax.persistence.PersistenceException Failed to read from file 'C:\SafeQORS\server\cache\MainORSCache.odb' (error 117 ... .UserException: Failed to read from file 'C:\SafeQORS\server\cache\MainORSCache.odb' at com.objectdb.o

Can't open DB-file with explorer, but from within my code it works

Hi, The problem occured since an update from my old-version (2.4.7_08) to the new version(2.4.7_18): 1) my recent db-file, created with the old-version, has been copied to the local db-folder ... programatically (from within my code) without any errors 4) the db doctor ends without error messages

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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