ObjectDB ObjectDB

Internal Website Search

51-60 of 200 resultsRefresh

2.5.3_02: java.lang.UnsupportedOperationException

) at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582) at org.jboss.weld.ejb ... .invoke(Method.java:606) at org.jboss.weld.util.reflection.Reflections.invokeAndUnwrap(Reflections.java:396) at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.invoke

FROM clause (JPQL / Criteria API)

over all the Country objects in the database: SELECT c FROM Country AS c The AS keyword is optional, and the same query can also be written as follows: SELECT c FROM Country c By default, the name ... pair of countries that do not share a border, returning as results only neighboring countries

JPA Persistable Types

can be stored in the database directly. Other persistable types can be embedded in entity classes as fields ... a class as an entity is to mark it with the Entity annotation: import javax.persistence.Entity ... user defined class (but not system classes, such as ArrayList) and implement any interface

objectdb-2.6.9_06: Extended Persistence Context fails: 'Attempt to begin a new transaction when a transaction is active'

entity wiring methods: As simplified here to demonstrate the problem: @Singleton @Startup public ... one wishes to build, but it's not an ideal solution. It works (for now) as a workaround ... a transaction such as buildProject() causes with ObjectDB 2.6.9_06 the same error as initially reported

Privacy Policy

our Service or parts of our Service. Company (referred to as either "the Company", "We", "Us" or "Our" in ... the Service such as a computer, a cellphone or a digital tablet. Personal Data is any information ... is accessing or using the Service, as applicable. Collecting and Using Your Personal Data Types

Strings in JPQL and Criteria Queries

String values may appear in JPQL queries in various forms: as string literals - e.g. 'abc', ''. as parameters - when string values are assigned as arguments. as path expressions - in navigation to persistent string fields. as results of predefined JPQL string manipulation functions. LIKE - String

[ODB1] Chapter 3 - Persistent Classes

. The JDO specification refers to persistent classes as persistence capable classes. 3.1 Persistent ... and can have only transient objects as instances. To become persistent, a class has to: be declared ... automatically, as explained in section 3.3. ObjectDB's JDO Enhancer also adds a no-arg constructor

[ODB1] Chapter 9 - ObjectDB Explorer

databases. 9.1 Running the Explorer The Explorer is a pure Java GUI application. It is shipped as ... can be specified as an argument to explorer.exe during startup. For instance: > explorer.exe ... queries in the Explorer, as discussed below. Finally, the "Thread" window, unlike

[ODB1] Chapter 2 - A Quick Tour

instances. ObjectDB, as a pure object database, can simply store a memory data structure in the database as is. If the database is not empty (not the first run), a previously stored ArrayList instance ... the database in a finally block, as demonstrated in the next sample program, to ensure database

[ODB1] Chapter 5 - JDO Connections

environment for using JDO. Explanations on how to use this environment to do database operations, such as ... . Both PersistenceManagerFactory and PersistenceManager are defined as JDO interfaces, not as classes ... Properties can also be specified in a file, as demonstrated by the following properties file: javax.jdo

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.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support