RE: JDBC vs ODBC Performance

["Richard Dean" <rddean@xxxxxxx>]

Thanks for the help everyone, as usual you have more than answered my
question.


-----Original Message-----
From: owner-java400-l@midrange.com
[mailto:owner-java400-l@midrange.com]On Behalf Of cujo@us.ibm.com
Sent: Friday, January 21, 2000 5:25 PM
To: JAVA400-L@midrange.com
Subject: Re: JDBC vs ODBC Performance



1) The description of what to change looks perfect although you could
consider this:

Class.forName("com.ibm.db2.jdbc.app.DB2Driver");

instead of this:

DriverManager.registerDriver(new com.ibm.db2.jdbc.app.DB2Driver());

The advantage?  The JDBC driver will register itself by creating a copy of
itself in its own static initializer and calling the registerDriver
function automatically.  The second way will cause two DB2Driver objects to
get created.  The first one when the static initializer runs (which also
does the register - you can't stop that) and then one is created for the
statement above.  Then registerDriver is called a second time but because
the driver is already registered nothing happens.

The other advantage to the second way is that you just have a string
difference for different JDBC drivers so it is easier to pick up the right
value from a properties file and use it.  (Ok, that is really just
opinion).

Both will work (with the Native JDBC driver or any other driver that is
built the way they are supposed to be).

2) The bit about QTMHHTTP does apply only to the toolbox rec level i/o.

Regards,

Richard D. Dettinger
AS/400 Java Data Access Team

"TRUE! nervous, very, very dreadfully nervous I had been and am; but why
WILL you say that I am mad?
The disease had sharpened my senses, not destroyed, not dulled them. "

- Edgar Allan Poe
"The Tell-Tale Heart"




"Alex Garrison" <agarrison@logtech.com> on 01/21/2000 02:42:28 PM

Please respond to JAVA400-L@midrange.com

To:   JAVA400-L@midrange.com
cc:
Subject:  Re: JDBC vs ODBC Performance




Richard,

1. From code you sent, you are using the toolbox jdbc driver.  If you want
to use the native db2 jdbc driver try:
      DriverManager.registerDriver(new com.ibm.db2.jdbc.app.DB2Driver());
      connection = DriverManager.getConnection
("jdbc:db2:my400","myuserid","mypassword");

    Make sure your class has import com.ibm.db2.jdbc.app.* instead of
import
com.ibm.as400.access.*

2. As far as I know the bit about QTMHHTTP applies only to the toolbox rec
level i/o.


Alex Garrison

----- Original Message -----
From: Richard Dean <rddean@gdi.net>
To: <JAVA400-L@midrange.com>
Sent: Friday, January 21, 2000 2:24 PM
Subject: JDBC vs ODBC Performance


> Back in early November of last year Alex Garrison brought up the issue of
> "forcing native access with websphere and toolbox".  And there were a
bunch
> of responses about getting the most optimized connection through JDBC vs
> ODBC.  Two things came up.
>
> 1. One message said that you can configure your servlet to use the native
> DB2 JDBC drivers instead of the toolbox drivers for faster access.  So
how
> do you do this?  I will show how I am doing it below.
> 2. The other thing is Alex mentioned something about connecting with user
id
> QTMHHTTP to insure the bypass of TCP/IP on the 400.  Does this only apply
to
> record level access?  Or can I do this with JDBC/ODBC to get the same
> improvements?
>
> Here is how I am doing it:
>
> // Load the AS/400 Toolbox for Java JDBC driver.
> DriverManager.registerDriver(new com.ibm.as400.access.AS400JDBCDriver());
>
> // Get a connection to the database.
> connection = DriverManager.getConnection ("jdbc:as400://my400",
> "MY_USER_ID", "MY_PASSWORD");
> DatabaseMetaData dmd = connection.getMetaData ();
>
> Is there a better way?
>
>
>
> Thanks in advance.
>
> Richard Dean
>
>
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