POJOs <--> xml def <--> SQL : How do you do it?

Leonig Mig · **Joined:** Fri Oct 08, 2004 9:26 am **Posts:** 17

Once a new datatype is all set up, hibernate is lovely. It always takes me ages to set up a new datatype though, makeing sure the three different elements are all in sync.

I seem to do it a different way round everytime-

How you do it? What is the best/easiest way of generating? I would love to write the XML, press a button and have the POJOs and database tables created by magic.

jelmer · **Joined:** Thu Sep 25, 2003 7:21 pm **Posts:** 17

Quote:

I would love to write the XML, press a button and have the POJOs and database tables created by magic.

You can do that, from the .hbm.xml file you can generate the database schema with the hbm2ddl script (or the net.sf..hibernate.tool.hbm2ddl.SchemaExportTask ant task)

similarly you can generate java code from the same xml file with hbm2java (or the net.sf.hibernate.tool.hbm2java.Hbm2JavaTask ant task)

I personally prefer the xdoclet approach though

Leonig Mig · **Joined:** Fri Oct 08, 2004 9:26 am **Posts:** 17

why do you prefer xdoclet? is it just a personal thing or does it actaully make life easier/create better code/save time?

I really want to get to grips with hibernate as I think it could be a very useful tool for years to come.

thanks.

anthony · **Posted:** Sat Oct 09, 2004 10:33 am

it depends on how you are working?
Are you doing db schema first? domain model first?

Leonig Mig · **Joined:** Fri Oct 08, 2004 9:26 am **Posts:** 17

always domain model first.

anthony · **Posted:** Sat Oct 09, 2004 12:50 pm

do you know http://www.hibernate.org/102.html ?
what is sure is that you can use schemaexport.

now try xdoclet to see if it fit to generate mapping files...

The problem with xdoclet is that it will do the same job that jsr 175 in hibernate3;

Quote:

JDK 1.5 Enhancements
The new JDK has been released as a preview earlier this year and we expect a slow migration to the new 1.5 platform throughout 2004. While Hibernate3 still runs perfectly with JDK 1.2, Hibernate3 will make use of some new JDK features. JSR 175 annotations, for example, are a perfect fit for Hibernate metadata and we will embrace them aggressively. We will also support Java generics, which basically boils down to allowing typesafe collections.

Mapping files are not so hard to write...