EJB 3.0 Java Persistence with Oracle TopLink

EJB 3.0 Java Persistence API JPA with Oracle TopLink Bill Lyons Systems Architect Huntsford Consulting [email_address]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object]

Overview ,[object Object],[object Object],[object Object]

J2EE Application Deployment View

Design separation in a typical web-based J2EE application ,[object Object],TopLink simplifies the development and maintenance of the ‘Model’ portion of an MVC application.

The Persistence Management Problem ,[object Object],[object Object],[object Object],[object Object],[object Object]

Competing Technologies that solve the persistence problem: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TopLink: recommended for new development efforts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Demo Development/ Deployment Environment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TopLink Project Artifacts ,[object Object],[object Object],[object Object],[object Object],[object Object]

TopLink Getting Started ,[object Object],[object Object],[object Object],[object Object],[object Object]

TopLink My First Persistence Tier ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Setting up the Project ,[object Object],[object Object],[object Object],[object Object]

Create a new Application and Workspace in JDeveloper You can type anything for Application Name and Directory Name. In general, JDeveloper like most Java Development Environments will behave inconsistently with spaces between characters so don’t use them in names or directory paths. Choose Web Application [JSF, EJB, TopLink] for the Application Template and click OK.

Create EJB 3.0 Entity Objects using TopLink ,[object Object],[object Object],[object Object],[object Object],[object Object]

Using JDeveloper wizards to create TopLink objects using EJB 3.0 APIs Be sure to choose EJB and Entities from Tables (JPA/EJB 3.0) when creating the persistence tier

Examining the Generated TopLink Entity Objects A Java Entity object will be created for every table that is selected in the wizard. It is possible to also select database views and synonyms for generation. The Entity object contains table metadata, get/set methods for each column and named queries for the Entity. A separate Java object will be created for querying and enforcing primary key constraints.

Examining the Generated Java Source Code: for the ExpertiseAreas POJO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Examining the Generated Java Source Code: Column Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Build a session bean to expose the Entities and provide session functionality From the New Gallery choose Business Tier, EJB, Session Bean (EJB 1.1/2.x/3.0)… Accept all defaults.

Purpose of the Session Bean ,[object Object],[object Object]

Examining the Generated Source Code for the Session Bean ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Build a simple test client To create a test client right click on the SessionEJBBean.java that we generated earlier in the project and choose New Sample Java Client…

Examine the Generated Code for the Test EJB Client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Testing it all out ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

It works! …sort of ;-( ,[object Object],[object Object]

Refining the generated code ,[object Object],[object Object],[object Object]

TopLink CRUD query methods Match Up Question: ,[object Object],[object Object],[object Object],[object Object],[object Object],?

TopLink CRUD query operations: ANSWER ,[object Object],[object Object],[object Object],[object Object],[object Object]

Select All data query ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Inserting Data using the persistEntity() method ,[object Object],[object Object],[object Object],[object Object],[object Object]

Updating data using the mergeEntity() method: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Delete data using the remove EntityName () method ,[object Object],[object Object],[object Object],[object Object]

How do you find an Entity Row by Primary Key? ,[object Object],[object Object],[object Object]

Find a row by primary Key: Step 1. Create a Named Query in Products.java EntityBean ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Code that we added

Find a row by primary Key: Step 2. Expose the new method ,[object Object],Right click on the SessionEJBBean.java file and then Select Edit Session Façade…

Find a row by primary Key: Step 3. ,[object Object],Check the newly created Products.findByProdId method. This will make it available to clients at runtime.

Method generated for our new query in the session bean: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Test our new query in the EJB test client ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Handling Schema Design Changes ,[object Object]

Persistence Framework Issues ,[object Object],[object Object]

Recommendations ,[object Object],[object Object],[object Object],[object Object],[object Object]

Helpful information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

EJB 3.0 Java Persistence API (JPA) with Oracle TopLink Bill Lyons Systems Architect Huntsford Consulting [email_address]

EJB 3.0 Java Persistence with Oracle TopLink

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