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9

Obtaining a JPA Database Connection

In JPA a database connection is represented by the EntityManager interface. Therefore, in order to manipulate an ObjectDB database we need an EntityManager instance. Operations that modify database ... to get an EntityManager instance. JPA requires the definition of a persistence unit in an XML file in order
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Query Parameters in JPA

(no matter in which order). Ordinal Parameters (?index) In addition to named parameters, whose form ... methods in order to specify what they represent, such as a pure date, a pure time or a combination
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ObjectDB 2.8 Developer's Guide

(SQL, JDBC, ORM or JPA) is not required in order to follow this guide, but a strong background ... on practical issues in order to make the reader proficient in a short time. After reading
9

Eclipse Public License - v 1.0

intellectual property infringement. In order to qualify, an Indemnified Contributor must: a) promptly notify ... . Everyone is permitted to copy and distribute copies of this Agreement, but in order to avoid inconsistency
9

ObjectDB Object Database Features

. Nested paths inside embedded objects are indexable. Indices are also used for fast ordering and aggregate ... expressions). GROUP BY (including HAVING and aggregates). ORDER BY (including ASC, DESC). Aggregates
9

JPA Criteria API Queries

, count, sum, avg, min, max, ...). ORDER BY clause (orderBy, Order, asc, desc). The links
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javax.persistence.OrderBy

the ordering of the elements of a collection valued association or element collection at the point when the association or collection is retrieved. The syntax of the value ordering element is an orderby ... _field_name] [ASC | DESC] If ASC or DESC is not specified, ASC (ascending order) is assumed
7

javax.persistence.OrderColumn

a column that is used to maintain the persistent order of a list. The persistence provider is responsible for maintaining the order upon retrieval and in the database. The persistence provider is responsible for updating the ordering upon flushing to the database to reflect any insertion, deletion
0

[ODB1] Chapter 5 - JDO Connections

values should be specified in order to change the default. In addition, the PersistenceManagerFactory ... Lock Management ObjectDB manages an automatic lock mechanism in order to prevent a database object
0

javax.jdo.Query

, import statements, ordering and grouping specifications, result and result class, the range ... declarations, variable declarations, imports, ordering specification, uniqueness, result specification ... of the method binds the named expressions in turn to parameters in the order in

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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