Develop the Server-Side-Class for the Business Object 'Project' - Fat-Client-Development

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Last revision of this document:
2006-08-14

Business Objects are entities that keep together data belonging to one 'business-area'; e.g. an invoice with a 'header' and several 'positions'. Business Objects can contain data that is physically stored on different database-tables.

For the theory about Business Objects please consult Using Business Objects to handle data-storage and retrieval.

`Preface:`

If you came to this document to get a guideline for developing a Business Object, I recommend to start with the document Business Object, Overview – Advanced Java Fat-Client-Development or go directly to the ToDo-List in document Business Object, General Class – Advanced Java Fat-Client-Development.

As classes for Business Objects have a critical mission within an application, preference was given to performance if there has to be made a decision between understandability and performance. I hope, that the comments placed in the code will help you to understand what intention is behind the code.

`Credits:`

Too numerous to mention; the idea is available in dozens of versions – I refined a lot of ideas into my system.

Prerequisites:

This step requieres to have the base-classes imported (see Download the jar-file for the base-classes) or written by yourself as guided by the tutorial to develop a Fat-Client application in Java.

JS_FC01j – Develop the General Class for the Business Object 'Project' completed - and its prerequisites too.

JS_FC01m – Develop the Data-Base-Access (DBA) Object for the table 'Project' completed - and its prerequisites too.
To get the ideas and the theory of Business Objects it is recommended to browse the following documents:
Using Business Objects to handle data-storage and retrieval and
Business Object, Overview – Advanced Java Fat-Client-Development.

`Create the Server-Side Business Object for the 'Project':`

As lined out in Using Business Objects to handle data-storage and retrieval, a Business Object will be derived into a Server-Side- and a Client-Side-Version.

To create the class for the Data-Base-Access Object, right click onto the project 'JS_FC01' and select >New>Class
Enter the Package (js_errdb.bos), the (Class-)Name (JS_ErrDB_Project_BOS – note the 'S' at the end, please), enter or 'Browse' the Superclass (JS_ErrDB_Project_BO) and check that no checkbox is selected; then click the [Finish] button.

Eclipse has already generated a template and the individual code can be entered. Please see the code to be entered at JS_ErrDB_Project_DBA - or copy it from there ;-) .

top.

`Next Steps:`

Whats needed next is a class to access the database-system JS_FC01e - Universal structure for parameters and getting the directories.
After that, the access to the database has to be implemented. JS_FC01f - Code a class to read files with XML-structure.