About persistence

manual

Storing JPA Entity Objects

Explains how to use JPA to store (persist) entity objects in the database.... the object with an owner EntityManager javax.persistence.EntityManager JPA interface Interface used to interact with the persistence context. See JavaDoc Reference Page... em and changes ...

 
manual

JPA Persistence Unit

Explains how to define a JPA persistence unit in the persistence.xml file. A JPA Persistence Unit is a logical grouping of user defined persistable classes ... and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. This page covers the following topics: persistence.xml XML Mapping Metadata Managed Persistable ...

 
manual

JPA Persistable Types

Explains how JPA manages types, including entity classes, embeddable classes, primitive types, wrappers, string, date, enum, collections and maps.... as an entity is to mark it with the Entity javax.persistence.Entity JPA annotation Specifies that the class is an ... Page... annotation: import javax. persistence . Entity ;   @ javax.persistence.Entity ...

 
manual

Working with JPA Entity Objects

Explains the entity object lifecycle and the persistence context.... Entity Object Life Cycle The Persistence Context Entity Object Life Cycle The ... not yet associated with an EntityManager javax.persistence.EntityManager JPA interface Interface used to interact ...

 
manual

Database Connection using JPA

Describes the main JPA interfaces: EntityManagerFactory, EntityManager and EntityTransaction. Working with the Java Persistence API (JPA) consists of using the following interfaces: This ... is represented by an EntityManager javax.persistence.EntityManager JPA interface Interface used to interact with the persistence context. See JavaDoc Reference Page... instance, which ...

 
page

What is the Java Persistence API (JPA)?

The Java Persistence API (JPA) is a standard API for accessing databases from within ... management system with built in support of the Java Persistence API (JPA). By interacting with ObjectDB using standard JPA you can ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in a NetBeans Spring MVC web application project.... New > Entity Class ... (or  New > Other... > Persistence > Entity Class and clicking  Next ). Enter Guest as ... Database] step click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in a NetBeans Java EE 6 web application.... New > Entity Class ... (or New > Other... > Persistence > Entity Class and clicking Next ). Enter ... step just click Finish to generate a default persistence.xml file with a default persistence unit (that will be configured ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in an Eclipse Spring MVC web application project.... import java. sql . Date ; import javax. persistence . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ...

 
tutorial

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class:... import java. sql . Date ; import javax. persistence . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ...