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Date and Time in JPQL and Criteria Queries

expressions are re-evaluated on the server on every query execution to reflect the date and time

Defining a JPA Entity Class

. Only the persistent state of the entity object, as reflected by its persistent fields is stored. By default, any

JPA Metamodel API

The JPA Metamodel API, which is introduced in JPA 2.0, enables examining the classes, fields and properties of the persistent object model, similarly to the Java reflection API. The main interface of the JPA Metamodel API is: Types (mainly classes) and attributes (persistent field and properties

CRUD Database Operations with JPA

a Double object reflecting the average x value of all the Point objects in the database. Retrieving

Running JPA Queries

object, which is a Long object reflecting the number of Country objects in the database

Online Backup

on the server side). A new subdirectory with a name that reflects the current date and time (e.g

Database Explorer

the Explorer might display cached content that does not reflect the up to date data in the database. In

JPA Primary Key

that is attached to the entity class using the @IdClass annotation. The ID class reflects the primary

[ODB1] Chapter 3 - Persistent Classes

. Only the state of the object as reflected by its persistent fields is stored. Persistent fields, by default

[ODB1] Chapter 5 - JDO Connections

. The type of the exception is a JDOException subclass that reflects the specific error that occurred

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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