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| == Getting Startedanchor:Getting_Started[] |
| |
| Using JDO requires several components that work together: |
| |
| * a database that stores your data persistently |
| * an application that operates through the JDO layers on the database |
| * a JDO implementation that provides the implementation of the JDO APIs |
| * Java classes (object model) that provide the application view of the data |
| |
| A good place to start is to define your object model. This is the collection |
| of Java classes that you use to represent the persistent data in your |
| database. Some JDO implementations allow you to create your database schema |
| from your object model. Or you might already have a database and database |
| schema that you can use to derive the object model. |
| |
| You will also need to define Java classes that implement the application |
| that operates on the object model. The application is responsible for |
| using the JDO implementation classes to define the application view of |
| PersistenceManagerFactory and PersistenceManager. |
| |
| Next, choose a JDO implementation. You can get information |
| on JDO implementations here. Some factors to consider when choosing |
| a JDO implementation is what databases they support, what Java version |
| they support, and whether they provide tools to create database schema from |
| an object model or create an object model from the database schema. |
| |
| Some JDO implementations also package the JDO interfaces as a separate |
| jar file, so there may be no need to download the JDO interfaces from this |
| site. |
| |
| More information on how to proceed can be found on your JDO implementation site. |
