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From Bojan Smojver <>
Subject RE: [PATCH] change JDBCRealm to add flexibility in table layout
Date Wed, 06 Mar 2002 22:04:09 GMT
I conceptually agree with such an approach, especially if the number of
users is big (although it's trivial to keep those two table synced in
PostgreSQL for small amount of users). But the actual primary keys have
to be some sort of synthetic keys (something like SERIAL or a generated
key, guaranteed to be unique) rather then 'hand written', which might
create problems down the track. For instance, user 'jack' decides that
he's going to be 'tom' from now own, but his primary key is still
'jack'. Then another 'jack' comes along and you have a clash of primary
keys, which makes it difficult for the database maintenance program
(i.e. you have to resort to finding the next one up or something).

Is your user database so big that you can't use REFERENCES ... ON
UPDATE/DELETE CASCADE to keep those things in sync?


On Thu, 2002-03-07 at 01:25, John Gregg wrote:
> I assumed increased flexibility + backwards compatibility would be welcome.
> After all, Tomcat has to serve the needs of many different users.  Some of
> those users, including me, are working for clients who aren't willing to
> spend the money on things like WebLogic or Oracle.  Instead, we use Tomcat,
> which works great, and databases like PostgreSQL and MySQL.  As you've shown
> with the views, as a PostgreSQL user, I don't absolutely NEED the patch I've
> provided, but I consider it an improvement nonetheless because I value
> flexible designs.  I would expect the MySQL users to appreciate a solution
> that works for everyone, not just everyone else.
> After this patch, I was considering cleaning up some of the exception
> handling issues in JDBCRealm, but from now on I'll confine myself to
> ordinary bug fixes and not design "improvements."
> john
> -----Original Message-----
> From:
> [
> g]On Behalf Of Ignacio J. Ortega
> Sent: Tuesday, March 05, 2002 1:43 PM
> To: 'Tomcat Developers List'; ''
> Subject: RE: [PATCH] change JDBCRealm to add flexibility in table layout
> ( Syntax aproximated maybe sql-92, more or less )
> create table users
> (
>   user_id   integer not null primary key,
>   user_name varchar(15) not null ,
>   user_pass varchar(15) not null
> );
> create table user_roles
> (
>   role_id   integer not null primary key,
>   user_id   integer not null,
>   role_name varchar(15) not null
> );
> create view user_roles_jdbcrealm
> as
> select u.user_name,ur.role_name
> from user_roles ur join users u
> on (ur.user_id=u.user_id)
> and use this view in jdbcrealm..
> Please add what you need to be able to understand you..
> Saludos ,
> Ignacio J. Ortega
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