About Metadata API

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About ObjectDB Database [2017-10-24]

100% pure Java Object-Oriented Database Management System (ODBMS). No proprietary API - managed only by standard Java APIs (JPA 2 / JDO 2). Extremely fast - faster than any other JPA / JDO product
Manual
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Chapter 4 - JPA Queries (JPQL / Criteria) [2011-04-01]

well as how to use the JPA Criteria API, which provides an alternative way for building queries in JPA, based on JPQL. The first section describes the API that JPA provides for using dynamic and static
FAQ
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Can I use ObjectDB to access a relational database?

To access relational databases using the Java Persistence API (JPA) you will need an Object Relational Mapping (ORM) tool, such as Hibernate, TopLink, EclipseLink, Open JPA or DataNucleus. The DataNucleus ORM implementation supports also the Java Data Objects (JDO) API. ObjectDB is a full featured
Manual
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Chapter 4 - JPA Queries (JPQL / Criteria) [2018-09-15]

well as how to use the JPA Criteria API, which provides an alternative way for building queries in JPA, based on JPQL. The first section describes the API that JPA provides for using dynamic and static
JDO Doc
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javax.jdo.spi.JDOPermission

to malicious code. getMetadata This allows getting metadata for any PersistenceCapable class that has registered with JDOImplHelper. This is dangerous in that metadata information (possibly confidential ... metadata for any PersistenceCapable class that has registered with JDOImplHelper. This is dangerous in
Forum
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JPQL JOIN FETCH Error

fetch doi.metadata metadata left join fetch metadata.titles titles left join fetch metadata.creators creators left join fetch metadata.descriptions descriptions left join fetch metadata.publishers publishers left join fetch metadata.contributors contributors left join fetch metadata.dates
JDO Doc
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JDO Reference (JavaDoc) [2018-08-18]

This reference contains the API documentation (similar to JavaDoc) of JDO 2.2. The content is derived from the original JDO documentation with some additions and notes. The most basic JDO types are: All the other JDO types are organized into the following sections:
Manual
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GROUP BY and HAVING clauses

HAVING COUNT(c) > 1 can be built using the criteria query API as follows: CriteriaQuery
Manual
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ObjectDB Developer's Guide [2018-08-07]

Welcome to ObjectDB for Java/JPA Developer's Guide. Here you can learn how to develop database applications using ObjectDB and JPA (Java Persistence API). The main purpose of this guide is to make you productive with ObjectDB and JPA in a short time. Guide Structure This manual is divided into
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What is new in ObjectDB 2.0?

ObjectDB 2.0 supports many new features and improvements, including: Most of the features of the new JPA 2.0 and JDO 2.2 APIs. User defined IDs (primary key) and sequences. Support of unlimited index keys size. SQL like queries ("select from ... where ..."). Real non blocking multithreading in