Is there any practical reason to use DB helper class?

Is there any practical reason to use database helper class ( e.g. database.bookDB in Duke's bookstore)in servlet design? What if I setup a DB connection for every servlet?

to ken_robinson
I am currently setup DataSurece in servlet init().Usually (I know WebLogic is this way), if you configure the DataSource through the app server's configuration app, it is available to all applications.
The most efficient way to look up the DataSource in a particular app is have a ServletContextListener lookup the DataSource from JNDI and set it in the Context as an Attribute. Each servlet would then, in it's init() method, get the DataSource from the ServletContext (faster than using JNDI for each Servlet. The ServletContextListener requires the container you are running in support the 2.3 spec. If it does not, simply use a startup servlet (servlet that is loaded when the app is loaded) and do the same thing.

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Dear all,
Are there any possible reason RMAN generates some corrupt archive log files?
Best Regards,
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CONFIGURE CONTROLFILE AUTOBACKUP ON;
new RMAN configuration parameters:
CONFIGURE CONTROLFILE AUTOBACKUP ON;
new RMAN configuration parameters are successfully stored
old RMAN configuration parameters:
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u03/db/backup/RMAN/%F.bck';
new RMAN configuration parameters:
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/u03/db/backup/RMAN/%F.bck';
new RMAN configuration parameters are successfully stored
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CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 1 DAYS;
new RMAN configuration parameters:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 1 DAYS;
new RMAN configuration parameters are successfully stored
allocated channel: ch1
channel ch1: sid=99 devtype=DISK
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current log archived
After that I go to archive log directory "/u02/oracle/uat/uatdb/9.2.0/dbs" and use ls -lt command to see how many archive logs and my screen just hang. After we found out that we cannot use ls -lt command to read arch1_171.dbf
archive log, the rest of archive logs able to use ls -lt command.
We cannot delete this file as well. We shutdown database abort and perform check disk...... and fix the disk error and then open database again. Everything seems back to normal and we can use ls -lt command to read arch1_171.dbf.
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Does anyone encounter the same problem?
Amy

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DVI
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Is there any advantage to use database helper class

Is there any advantage to use database helper class ( e.g. database.bookDB in Duke's bookstore)in servlet design? What if I setup a DB connection for every servlet?

If there is not much relation between servlets.For example one servlet working on authentication againist user name/password in database another one work on searching book by keywords?
and if we want to have servlets written by difference programmers?

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Is there any practical reason to use DB helper class?

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