Accessing meta-tag content from code

shoka · **Joined:** Wed Sep 03, 2003 8:55 am **Posts:** 7

Can the content of [code]meta[/code]-tags defined in mapping documents (used by hbm2java, for example) be accessed from client code or, if not, is this feature going to be implemented in a future version?

.shoka.

Adrien · **Posted:** Tue Oct 07, 2003 3:25 am

I reported this need few months ago. I like to add that another need for me would be to access to the length of the string fields. This would allow me to directly restrain user input in forms to the max length in the database with a simple framework. Nothing is more boring than copy the max length from my 50 fields from my hbm files to my forms.

http://opensource.atlassian.com/projects/hibernate/secure/ViewIssue.jspa?key=HB-173

Adrien

max · **Posted:** Tue Oct 07, 2003 3:53 am

Currently the meta tag information is not available at runtime - but we will consider it's inclusion, if we find a good way to provide it ;)

The length of fields IS accessible via the current metadata in Hibernate2.
You can get them from the Configuration object which has a set of getXXXMapping(s). e.g. cfg.getClassMapping(Foo.class) will return a PersistentClass where you have access to all the length you will ever want ;)

/max

Adrien · **Posted:** Tue Oct 07, 2003 12:22 pm

I don't find any method to access to the length in PersistentClass neither in RootClass.

I post modifications of few classes to allow access to length and metadata (at least for properties) with the ClassMetaData on JIRA.

(Sorry, I have some problem with the diff command to make a patch).

http://opensource.atlassian.com/project ... key=HB-173

Adrien

max · **Posted:** Tue Oct 07, 2003 3:10 pm

Configuration.getClassMappings() returns a list of PersistentClass,
on this you can do getProperty(propname).getColumnIterator()

And this give you a Column - which got the info.

shoka · **Joined:** Wed Sep 03, 2003 8:55 am **Posts:** 7

I'm not interested on the length and/or types of the properties, but instead trying to find a convenient way of expressing automatic validation instructions for business objects - this is done by a layer directly on top of (and hiding it from the application) persistence engine (Hibernate).

The most convenient way of course is to use Apache's validation framework coupled with definition of validation rules in Hibernate mapping documents and a custom interceptor which triggers validation when necessary. It can of course be implemented by additional validation document, but it would be a real pain to write these..

That's why I need the actual tag content. :)