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Apache License, Version 2.0, January 2004

the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 ... mean the work of authorship, whether in Source or Object form, made available under the License, as ... , elaborations, or other modifications represent, as a whole, an original work of authorship

Numbers in JPQL and Criteria Queries

Numeric values may appear in JPQL queries in many forms: as numeric literals - e.g. 123, -12.5. as parameters - when numeric values are assigned as arguments. as path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection functions

Retrieving JPA Entity Objects

of the database. The persistence context serves as a cache of retrieved entity objects. If a requested ... is then added to the persistence context as a managed entity object and returned to the application ... of entity classes and to keep them as simple as possible. Retrieval by Class and Primary Key Every entity

Database Explorer

it from the command line as follows: > java -jar explorer.jar If explorer.jar is not in the current ... and JDOQL queries, as discussed below. Closing a Database Connection Use the File > Close menu command ... . A Tree window displays objects as a tree. Every database object is represented by a tree node

Query Parameters in JPA

whose name field value is equal to :name, which is a parameter that serves as a placeholder ... (:) followed by a valid JPQL identifier that serves as the parameter name. JPA does not provide an API ... . Criteria Query Parameters In a JPA query that is built by using the JPA Criteria API - parameters (as

GROUP BY and HAVING clauses

to grouping by the GROUP BY clauses before arriving at the SELECT clause. GROUP BY as DISTINCT ... which returns the first letters as result. ObjectDB is very flexible in allowing JPQL expressions anywhere in ... all the JPA implementations. Grouping the Country objects makes them inaccessible to the SELECT clause as

JPA Entity Fields

are always considered to be transient. Other fields can be declared explicitly as transient using ... store methods or code. Only the persistent state of the entity object, as reflected by its persistent ... type, including a generic java.lang.Object, as long as the type of the actual value at runtime

Eclipse Public License - v 1.0

brought by any other entity based on infringement of intellectual property rights or otherwise. As ... , such as lost profits; iii) states that any provisions which differ from this Agreement are offered ... notices contained within the Program. Each Contributor must identify itself as the originator

JPA / JDO Class Enhancer

tracking of persistent field modifications, avoiding the need for snapshot comparison of entities (as ... (one-to-one relationship) have to be loaded eagerly. Special optimized methods are added to enhanced classes as ... file. You can run it from the command line as follows: > java -cp objectdb.jar com.objectdb

WHERE clause (JPQL / Criteria API)

objects to the SELECT clause for collecting as query results, the WHERE clause gets an opportunity to function as a filter. The boolean expression in the WHERE clause, which is also known as ... evaluates to TRUE are passed to the SELECT clause and then collected as query results. WHERE Predicate

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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