ObjectDB Database Search

Given an EntityManager , em , that represents a JPA connection to the object database, we can use it to store, retrieve, update and delete database objects. Storing New Entity Objects The following ... of this manual describes how to use JPA for database operations in more detail.

JPA Entity classes are user defined classes whose instances can be stored in a database. To store data in an ObjectDB database using JPA you have to define entity classes that represent your application data object model. This chapter explains how to define and use entity classes.  This chapter contains the following sections:

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.

The JPA Metamodel API provides the ability to examine the persistent object model and retrieve details on managed classes and persistent fields and properties, similarly to the ability that Java reflection provides for general Java types. The Metamodel Interface The main interface of the JPA

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 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 exceptions are represented by a hierarchy of unchecked exceptions: java.lang.Object java.lang.Throwable java.lang.Exception java.lang.RuntimeException javax.persistence.PersistenceException ... .TransactionRequiredException Exception Class Overview The root of the JPA exception class subtree is: General errors

The following annotations can mark methods as JPA callback methods: The Lifecycle Events section of the ObjectDB Manual explains how to use all these annotations on callback methods and with listener classes.

Callback methods are user defined methods that are attached to entity lifecycle events and are invoked automatically by JPA when these events occur. Internal Callback Methods Internal callback methods are methods that are defined within an entity class. For example, the following entity class

the ObjectDB configuration or in a JPA portable way, by specifying the cascade-persist XML element

The way a field of a persistable class is managed by JPA can be set by the following annotations: Additional annotations (and enum) are designated for enum fields: Other additional annotations (and enum) are designated for date and calendar fields: Chapter 2 of the ObjectDB manual explains how to use all the above annotations.

, [NOT] MEMBER [OF] and the [NOT] LIKE operator. Logical operators : AND, OR, NOT. In addition, JPA

The following interfaces and enum types represent attributes (persistent fields and properties) in the JPA Metamodel API: See the Metamodel Attribute Interface Hierarchy section for more details and examples.

The following interfaces and enum represent types in the JPA Metamodel API:  See the Metamodel Type Interface Hierarchy section for more details and examples.

The syntax of the Java Persistence Query Language (JPQL) is very similar to the syntax of SQL. Having an SQL-like syntax in JPA queries is an important advantage because SQL is a very powerful query language and many developers are already familiar with it. The main difference between SQL and JPQL

The following subsections explain how to use JPA for CRUD database operations:

the java.lang.Object  class in queries (as an extension to JPA ), so the following query

This section contains the most essential JPA types.

collection after query execution (e.g. by results.get(0) ). To eliminate this routine operation JPA

This section discusses advanced JPA topics:

Relationships are persistent fields in persistable classes that reference other entity objects. The four relationship modes are represented by the following annotations: Unlike ORM JPA implementations, ObjectDB does not enforce specifying any of the annotations above. Specifying a relationship

Entity objects are in-memory instances of entity classes (persistable user defined classes), which can represent physical objects in the database. Managing an ObjectDB Object Database using JPA requires using entity objects for many operations, including storing, retrieving, updating and deleting

Reference (JavaDoc) of JPA 2 value generation annotations, including @GeneratedValue, @SequenceGenerator and @TableGenerator.

Explains how to apply server side bulk update using a JPA/JPQL query.

support of the JPA and JDO APIs. Fundamental features of relational databases (e.g. primary keys ... Database with built in support for  JPA 2 . Java Persistence API ( JPA ) Most features of JPA 2 ... fast - much faster than any other JPA solution. General Highly optimized code (as a result of many

To open and run the  Quick Start with JPA tutorial project in IntelliJ IDEA: Download and extract the project zip file: Getting Started with JPA - Maven Project (3KB) Open the project in IntelliJ IDEA: Select File Open Project... . Select the points-console directory and click Open Project

To open and run the  JPA Web Application tutorial project in Eclipse: Download and extract the project zip file: JPA Web App - Maven Project (6KB) Open the Maven project in Eclipse: Select  File Import... Maven Existing Maven Projects and click  Next . Select the 

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 ... listener class that will manage a JPA's EntityManagerFactory representing the ObjectDB database.

To open and run the  JPA Web Application tutorial project in IntelliJ IDEA: Download and extract the project zip file: JPA Web App - Maven Project (6KB) Open the project in IntelliJ IDEA: Select File Open Project... . Select the guestbook-web directory and click OK . Define the Server

To open and run the Quick Start with JPA tutorial project in Eclipse: Download and extract the project zip file: Getting Started with JPA - Maven Project (3KB) Open the Maven project in Eclipse: Select File Import... Maven Existing Maven Projects and click Next . Select the points-console

To open and run the  Spring MVC JPA tutorial project in NetBeans: Download and extract the project zip file: Spring MVC JPA - Maven Project (8KB) Open the Maven project in NetBeans: Select  File Open Project... . Select the  guestbook-spring directory and click  Open

To store objects in an ObjectDB database using JPA we need to define an entity class: Right click on the project in the [Package Explorer] window and select New Class . Enter tutorial as the package name (case sensitive). Enter Point as the class name (case sensitive). Click Finish to create

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 tutorial package node (in the [Projects] window) and selecting New Java Class ... Enter Point as the class name - use exactly that case sensitive

To open and run the Java EE 6 Web Application tutorial project in Eclipse: Download and extract the project zip file: Java EE  JPA Web App - Maven Project (7KB) Open the Maven project in Eclipse: Select  File Import... Maven Existing Maven Projects and click  Next . Select

To open and run the  Java EE 6 Web Application tutorial project in NetBeans: Download and extract the project zip file: Java EE  JPA Web App - Maven Project (7KB) Open the Maven project in NetBeans: Select  File Open Project... . Select the  guestbook-jee6 directory

To open and run the  Java EE 6 Web Application tutorial project in IntelliJ IDEA: Download and extract the project zip file: Java EE  JPA Web App - Maven Project (7KB) Open the project in IntelliJ IDEA: Select  File Open Project... . Select the  guestbook-jee6

Demonstrates how to use ObjectDB as a data source of the Business Intelligence and Reporting Tools (BIRT), open source report generator.

All about General JPA Tutorials in Java/JPA database - explanations, examples, references, links and related information.

All about Web App JPA Tutorials in Java/JPA database - explanations, examples, references, links and related information.

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 Demonstrates basic database

(); Because the results are managed entity objects they have all the support that JPA provides ... detection , support for delete , etc. Query results are not limited to entity objects. JPA 2 adds ... an alternative to representing compound results by Object arrays, JPA supports using custom result

support for the Java Persistence API ( JPA ). It also supports a more recent and advanced version of the Java Data Objects (JDO) API than competing object databases. By using a standard API such as JPA ... relational database by using an ORM  JPA provider such as Hibernate, EclipseLink or Open JPA

literals (e.g. 077 , 077L ), a feature that is not currently supported by all JPA implementations. String ... can be used (e.g. "Adam\'s" , "abcd\n1234" ) but this is not supported by all the JPA implementations ... '} Enum Literals JPA 2 adds support for enum literals. Enum literals in JPQL queries use

JPA Method in javax.persistence.Query int getFirstResult () The position of the first result the query object was set to retrieve. Returns 0 if setFirstResult was not applied to the query object. Return: position of the first result Since: JPA 2.0 The Running JPA Queries article explains how to use getFirstResult .

JPA Constructor in javax.persistence.PessimisticLockException PessimisticLockException (   String message,    Throwable cause,    Object entity ... , and entity. Parameters: message - the detail message. cause - the cause. entity - the entity. Since: JPA 2.0

To store objects in an ObjectDB database using JPA we need to define an entity class: Open ... + ")"; } } The Guest entity class will represents guests in the database. We also need to configure JPA by setting ... to the persistence.xml file: com.objectdb. jpa .Provider Now ObjectDB should be used as a JPA provider

To store objects in an ObjectDB database using JPA we need to define an entity class: Open ... JPA persistence unit (with default settings) was generated in a persistence.xml file that was added ... with the following new content: com.objectdb. jpa .Provider Now ObjectDB should be used as a JPA provider

To store objects in an ObjectDB database using JPA we need to define an entity class: Right click ... + ")"; } } The  Guest entity class will represents guests in the database. We also need to configure JPA ... and paste to copy the following content to the  persistence.xml file: com.objectdb. jpa .Provider

To store objects in an ObjectDB database using JPA we need to define an entity class: Open ... JPA persistence unit (with default settings) was generated in a persistence.xml file that was added ... file with the following new content: com.objectdb. jpa .Provider guest.Guest Now ObjectDB should be used

for Java EE Developers, you can see in the [New] menu a command for creating a [ JPA Project ... with ObjectDB/ JPA support. ObjectDB/ JPA can also be added to existing projects, by adding ... JARs... The next step is creating a JPA Entity class .