Eduardo, first of all thank you for your reply. I solved the problem by
means of the following tags, which I could guess the community will find
useful (at least who is not aware of it):
In the ejb.bean element:
remote-business-interface="org.foo.SuperInterface"
This way your bean will not require the ejb.interface-method element and the
Business interface will inherit from the one specified above
If you have also a common home interface, which, if you are following the
pattern we did is likely the case, add the following element:
* @ejb.home
* extends="org.foo.DbManagerHomeInterface, javax.ejb.EJBHome"
What I don't like of your approach is that the database name shall be
'hard-coded' into the code, while with mine approach the various database
information (like the jndi name of the database-specific bean to look for)
is defined in an XML file, thus leading to a more dynamic solution. I mean
that if you change the bean for a specific database (let's say that you
could create a GenericBean, which does the same things for all the
databases, except from Oracle) you don't need to change the code, but only
the XML configuration file.
Cheerse,
Marco
----- Original Message -----
From: "Eduardo H. Ramirez R." <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, August 06, 2003 11:16 PM
Subject: Re: [Xdoclet-user] How to specify inheriting interfaces
I know this is not the answer to your question but It might be useful to
evaluate an alternate approach that consists in not writing a
SessionBean for each database, instead I propose you to write a sigle
SessionBean which uses "Adapters" for each DBMS, of course, this assumes
(but not requires) that the SessionBean is stateful.
public class SQLBean implements SessionBean {
private DBAdapter ad;
/**
* Choose a DB on creation time...
*
* @ejb:create-method
*/
public void ejbCreate(String db) {
if(db == "Oracle") {
setAdapter(new OracleAdapter("properties"));
}
}
private void setAdapter(DBAdapter ad) {
this.ad = ad;
}
/**
* This is an example wrapper method, it function
* should be invoking the adapter
* @ejb: interface-method
*/
public java.util.Collection executeSQL(String query) {
if(adapter != null) {
adapter.executeSQL(query);
}
}
}
On the other side the definitions of the interface and the
implementation ....
public interface DBAdapter {
public java.util.Collection executeSQL(String query);
//...
}
public class OracleAdapter implements DBAdapter { ...
And so on...
Regards...
On Wed, 2003-08-06 at 15:44, Marco Tedone wrote:
> Hi, we are developing an unusual applicatoin, basically centered on
session
> beans which manage database (not entity beans, because the data to be
> retrieved are dynamic). To make our application multi-database compliant,
> and following a pattern, we defined basically one Session bean for each
used
> database (MySQL, Oracle, SQLServer, Postgresql and other could be added).
> The application then choose the right session bean depending on user
> selections and this is possible thanks to a common interface which all the
> database-specific interfaces inherit from. This way a client will have
> simply to get a reference to the super-interface (as the methods are
common
> for every session bean) and polymorphism will be guaranteed. So far so
good.
> So far we developed the session beans manually but now I would like to
> migrate to XDoclet, even because we are planning to develop other beans,
and
> XDoclet will be of great help.
>
> As you will probably guess, our problem is how we could define via XDoclet
> that each database-specific interface will inherit from the common one
(now
> is possible because all the interface was declared manually).
>
> Any help will be appreciated.
>
> Marco
>
>
>
>
>
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--
Eduardo H. Ram�rez Rangel
Centro de Sistemas Inteligentes
5o. Piso Torre Sur CETEC, ITESM Campus Monterrey
(52-81) 8328-4380, 83-58-2000. Ext. 5134
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