About JPA

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Tutorial
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Spring MVC JPA Tutorial - Maven Project

The Spring MVC JPA tutorial provides step by step instructions on how to build a simple Java/JPA Spring MVC database driven web application in Eclipse or NetBeans. Building a new application step by ... application as a Maven project: Spring MVC JPA - Maven Project (7KB) If Maven is installed - extract the zip
JPA Doc
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JPA Annotations for SQL Queries

The following JPA annotations are designated for SQL queries on relational databases: ObjectDB supports only the preferred JPA query language, JPQL, and silently ignores all the above annotations.
JPA Doc
40

JPA Exceptions

JPA exceptions are represented by a hierarchy of unchecked exceptions: java.lang.Object java.lang.Throwable java.lang.Exception java.lang.RuntimeException ... of the JPA exception class subtree is: General errors are represented directly by
Tutorial
40

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New Java Class] dialog box, e.g. by right clicking the project node (in the [Projects] window ... is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.
JPA Doc
40

JPA Annotations for Classes

JPA defines three types of persistable classes which are set by the following annotations: Chapter 2 of the ObjectDB manual explains these annotations in detail. Entity and mapped super classes ... policy (as explained in chapter 3): Another JPA class annotation defines an ID class: ID classes
JPA Doc
40

JPA Annotations for Access Modes

Persistence fields can either be accessed by JPA directly (as fields) or indirectly (as properties and get/set methods). JPA 2 provides an annotation and an enum for setting the access mode: More details are provided in chapter 2 of the ObjectDB manual.
JPA Doc
40

JPA Annotations for Java EE

The following JPA annotations are in use to integrate JPA into a Java EE application and are managed by the Java EE container:
JPA Doc
40

JPA Annotations for Mapping (ORM)

The following JPA annotations and enums are designated for mapping a JPA object model to a relational database, and are not required by ObjectDB: ObjectDB silently ignores all the above annotations.
JPA Doc
40

JPA Miscellaneous

This section contains miscellaneous JPA types. The PersistenceUtil and PersistenceUnitUtil interfaces provide general utility methods: The Cache interface and the CacheRetrieveMode and CacheStoreMode enum types serve in managing the EntityManagerFactory's shared (level 2) cache: Other enum types are provided for setting of various JPA operations:
Tutorial
40

Step 2: Define a JPA Entity Class

To store objects in an ObjectDB database using JPA we need to define an entity class: Open the [New Java Class] dialog box, e.g. by right clicking the project node (in the [Package Explorer] window ... . The next step is adding a context listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.