You will have to define the jdbc connection in the datasource configuration
file on the appserver though.
The client should never use any jdbc directly :)
The Entity beans can be mapped using cmp or bmp and the lookup through the
JNDI context for the suitable connection instance is
done through the J2EE context classes as explained by Burr..
A normal method to do this is (inside an EJB in this example):
Connection conn = null;
try {
InitialContext ic = new InitialContext();
/* Here is the JNDI name...check orions data-sources.xml
* file in the config directory to see examples with hsql
*/And note that you should prolly choose to use the pooled-location
name
DataSource ds (DataSource)ic.lookup("jdbc/ProdObjectSpacePooledDS");
conn = ds.getConnection();
} catch (Exception ex) {
throw new EJBException(ex);
}
// .. do some JDBC stuff
conn.close();
Hope this helps you further :=)
Have fun!!
Klaus Myrseth
-----Opprinnelig melding-----
Fra: Burr Sutter [mailto:[EMAIL PROTECTED]]
Sendt: 31. januar 2001 15:21
Til: Orion-Interest
Emne: Re: R: R: frustrated - jdbc: No suitable driver
Hey Tom,
Potentially silly question (somewhat new to Orion but I've used a few other
app. servers). Are you basically saying that the use of a
javax.sql.DataSource acquried via a call to InitialContext.lookup() means I
don't need a JDBC Driver on a remote client machine (end-user's desktop)?
I was unaware that this trick would work. I've always tried to push all
database access to session beans, servlets or server-RMI objects.
Thanks,
Burr
[EMAIL PROTECTED]
----- Original Message -----
From: Tom Mitchell <[EMAIL PROTECTED]>
To: Orion-Interest <[EMAIL PROTECTED]>
Sent: Tuesday, January 30, 2001 9:28 PM
Subject: Re: R: R: frustrated - jdbc: No suitable driver
Jeff,
I disagree. Part of the benefit of a DataSource is that it can abstract
the actual driver or database being used. If I can ask a DataSource for
a database connection and not have to care about which client-side
driver to load, and (less practically), even what rdbms i am using.
That way, the app server can change databases, drivers, even vendors
without its clients being aware.
I experienced this issue porting an app from WebLogic. I used the same
schema and sql with SQL Server and Postgres on WebLogic. My client
application (which both queried and populated the database) never
changed. It just got a Context from the app server, gfot a DataSource
by name, then got plain old JDBC Connections from there. No JDBC
drivers at all.
I think that is a useful layer.
PS: I have unsubscribed from the list - if you would like to continue
the discussion, please reply to my personal address.
Thanks for your thoughts.
I appreciate your point of view, I just disagree with it.
Jeff Schnitzer wrote:
>
> If the client is going to use the JDBC driver, it must be able to load
> the class(es). This means you need to package the driver with the
> client application. I'm puzzled by your comments about clients not
> needing to care about drivers - are these classes just going to
> materialize out of thin air? I suppose in theory the server could do
> something with http classloading, but why bother with the extra
> complexity, security considerations, and licensing issues? You know
> you're going to need the classes anyways, package them with the client.
>
> Jeff
>
> >-----Original Message-----
> >From: Tom Mitchell [mailto:[EMAIL PROTECTED]]
> >Sent: Tuesday, January 30, 2001 9:08 AM
> >To: Orion-Interest
> >Subject: Re: R: R: frustrated - jdbc: No suitable driver
> >
> >
> >Again, thanks for your replies.
> >
> >What is curious to me is that the driver performs fine within a jsp. I
> >look up loc with no problem.
> >
> >It only has a problem from a client application. And, it does not seem
> >like a client to a DataSource should ever have to care about drivers -
> >that is the container's job in my opinion.
> >
> > <data-source
> > class="com.evermind.sql.ConnectionDataSource"
> > name="SomeDatasource"
> > location="loc"
> > xa-location="jdbc/xa/SomeXADS"
> > ejb-location="ejb/weather"
> > schema="database-schemas/postgresql.xml"
> > connection-driver="org.postgresql.Driver"
> > username="tom"
> > password="tR16/4"
> > url="jdbc:postgresql://192.168.1.5:5432/weather"
> > inactivity-timeout="30"
> > />
> >
> >Any more ideas?
> >
> >DeVincentiis Giustino wrote:
> >>
> >> Sorry, the message "No suitable driver" probably means a
> >problem with jdbc
> >> driver.
> >> So if you have into the data-sources.xml the definition:
> >>
> >> <data-source
> >> class="com.evermind.sql.DriverManagerDataSource"
> >> name="Hypersonic"
> >> location="jdbc/HypersonicCoreDS"
> >> xa-location="jdbc/xa/HypersonicXADS"
> >> ejb-location="jdbc/HypersonicDS"
> >> connection-driver="org.hsql.jdbcDriver"
> >> username="sa"
> >> password=""
> >> url="jdbc:HypersonicSQL:./database/defaultdb"
> >> inactivity-timeout="30"
> >> />
> >>
> >> you should lookup "jdbc/HypersonicDS", and you should have the driver
> >> classes in your /orion/lib directory.
> >>
> >> Giustino
> >>
> >> -----Messaggio originale-----
> >> Da: Tom Mitchell [mailto:[EMAIL PROTECTED]]
> >> Inviato: martedì 30 gennaio 2001 12.24
> >> A: Orion-Interest
> >> Oggetto: Re: R: frustrated - jdbc: No suitable driver
> >>
> >> Thanks for the reply. That is exactly how I am initializing
> >the context
> >> in my client application:
> >>
> >> Hashtable ht = new Hashtable();
> >> ht.put(Context.INITIAL_CONTEXT_FACTORY,
> >> "com.evermind.server.ApplicationClientInitialContextFactory");
> >> ht.put(Context.PROVIDER_URL, "ormi://192.168.1.3");
> >> ht.put(Context.SECURITY_PRINCIPAL, "someUser");
> >> ht.put(Context.SECURITY_CREDENTIALS, "secret");
> >> // Obtain connection
> >> InitialContext ctx = new InitialContext(ht);
> >>
> >> DeVincentiis Giustino wrote:
> >> >
> >> > Try initializing the context this way:
> >> > ...
> >> > Properties props = new Properties();
> >> >
> >>
> >props.setProperty("java.naming.factory.initial","com.evermind.s
> >erver.Applica
> >> > tionClientInitialContextFactory");
> >> > props.setProperty("java.naming.provider.url",
> >> "ormi://localhost/app-name");
> >> > props.setProperty("java.naming.security.principal", "admin");
> >> > props.setProperty("java.naming.security.credentials", "123");
> >> > InitialContext ctx = new InitialContext(props);
> >> > ...
> >> >
> >> > Giustino De Vincentiis
> >> >
> >> > -----Messaggio originale-----
> >> > Da: Tom Mitchell [mailto:[EMAIL PROTECTED]]
> >> > Inviato: martedì 30 gennaio 2001 1.23
> >> > A: Orion-Interest
> >> > Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
> >> > Oggetto: frustrated - jdbc: No suitable driver
> >> >
> >> > Hi All,
> >> >
> >> > I am used to WebLogic, so please pardon my ignorance...
> >> >
> >> > I am trying to get my WebLogic application to run on Orion.
> >> >
> >> > I have a DataSource set up to PostgreSql. It seems OK because this
> >> > Orion JSP works fine:
> >> >
> >> > InitialContext ctx = new InitialContext();
> >> > out.print("<br>Context: " + ctx);
> >> > DataSource ds = (DataSource) ctx.lookup("jdbc/DefaultDS");
> >> > Connection conn = ds.getConnection();
> >> >
> >> > // Create query and get results
> >> > Statement stmt = conn.createStatement();
> >> > ResultSet rs = stmt.executeQuery("select count(*) FROM
> >> > weathersnapshots");
> >> >
> >> > // List results
> >> > while ( rs.next() ) {
> >> > out.println( "<br>" + rs.getObject(1) + "<br>");
> >> > }
> >> >
> >> > // Close connection - important!
> >> > conn.close();
> >> >
> >> > This runs fine and gives me the count of rows in the table.
> >> >
> >> > When I try to get the standalone client to the same
> >DataSource to run, I
> >> > get this:
> >> >
> >> > Context: javax.naming.InitialContext@316e52
> >> > Exception in thread "main" java.sql.SQLException: No
> >suitable driver
> >> > at java.sql.DriverManager.getConnection(Unknown Source)
> >> > at java.sql.DriverManager.getConnection(Unknown Source)
> >> > at
> >com.evermind.sql.DriverManagerDataSource.getConnection(JAX)
> >> > at Test.main(Test.java:18)
> >> >
> >> > No errors appear on the server's console. I can not
> >imagine why I would
> >> > want to have a DB driver's jar in my client's classpath
> >(ALTHOUGH I HAVE
> >> > TRIED THAT).
> >> >
> >> > I have an application-client.xml:
> >> >
> >> > <application-client>
> >> > </application-client>
> >> >
> >> > I have scoured the list archives and can not find the solution.
> >> >
> >> > Remember, within the container, it runs fine. It is the
> >standalone app
> >> > that does not work.
> >> >
> >> > Using:
> >> > Orion 1.4.5
> >> > JDK 1.3
> >> > Win2K
> >> >
> >> > Thanks in advance.
> >> >
> >> > --
> >> > Tom Mitchell
> >> > [EMAIL PROTECTED]
> >> > Very Current Stoneham, MA Weather
> >> > http://www.tom.org
> >>
> >> --
> >> Tom Mitchell
> >> [EMAIL PROTECTED]
> >> Very Current Stoneham, MA Weather
> >> http://www.tom.org
> >
> >--
> >Tom Mitchell
> >[EMAIL PROTECTED]
> >Very Current Stoneham, MA Weather
> >http://www.tom.org
> >
> >
--
Tom Mitchell
[EMAIL PROTECTED]
Very Current Stoneham, MA Weather
http://www.tom.org
