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130

Is ObjectDB better than Object Relational Mapping (ORM)?

All about Is ObjectDB better than Object Relational Mapping (ORM)? in Java/JPA database - explanations, examples, references, links and related information.
95

Embedded Object inside another embedded object - is that possible?

I have an entity with an embedded object - it works fine. Now I am trying to add an embedded object inside the first level embedded object - but it does not seem to store it and does not throw either... I was wondering if it was a limitation or not? has anyone tried this before? Thanks EKK Emmanuel
20

Database Explorer

objects. The [Schema] window shows the user defined persistable types (entity and embeddable classes) in ... the approach of traditional visual database tools. Every row in the table represents a single object ... a single database object. This type of viewer is useful for viewing data of a simple object model. In
20

SELECT clause (JPQL / Criteria API)

The ability to retrieve managed entity objects is a major advantage of JPQL. For example, the following query returns Country objects that become managed by the EntityManager em: TypedQuery ... > results = query.getResultList(); Because the results are managed entity objects they have all the support
17

CRUD Database Operations with JPA

Given an EntityManager, em, that represents a JPA connection to the object database, we can use it to store, retrieve, update and delete database objects. Storing New Entity Objects The following code fragment stores 1,000 Point objects in the database: em.getTransaction().begin(); for (int
13

What is the Java Data Objects (JDO)?

The Java Data Objects (JDO) is another standard for accessing persistent data in databases, using plain old Java objects (POJO) to represent the object model. Unlike Java Persistence API (JPA ... with both relational and object databases. JDO is supported by many object databases, including ObjectDB
4

Constants.OPTION_MAPPING_HETEROGENEOUS_OBJECT_TYPE

Static Field javax.jdo.Constants String OPTION_MAPPING_HETEROGENEOUS_OBJECT_TYPE "javax.jdo.option.mapping.HeterogeneousObjectType" Since: JDO 2.1 See Also: PersistenceManagerFactory.supportedOptions()
2

[ODB1] Chapter 9 - ObjectDB Explorer

database objects visually, navigate among them and execute queries is very valuable during development ... information about the database and the bottom sub window displays a list of root objects that the database contains (root objects are discussed in chapter 6). The "Query" window enables a user to execute JDOQL
1

[ODB1] Chapter 7 - JDOQL Queries

There are various ways to retrieve objects from an ObjectDB database, as shown in section 6.3 ... for RDBMS. It provides object retrieval from the database according to a specified selectioPlan ... : A candidate collection containing persistent objects (usually an Extent) A candidate class (usually
1

[ODB1] Chapter 4 - JDO Metadata

in the JDO specification, are ignored by ObjectDB if specified (as a pure object database, ObjectDB always uses datastore identity with its own object-id class). 4.3 Metadata for Fields Unlike ... and persistent in JDO), or a field whose declared type is java.lang.Object or some interface

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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