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How to resolve persistent class from table name

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timmgrant

Post subject: How to resolve persistent class from table name

Posted: Tue Jul 31, 2007 5:29 am

Newbie

Joined: Tue Jul 31, 2007 5:14 am
Posts: 3

Hello,

Given a table name, is there any way to look up what persistent class it resolves to? I have a text table name and primary key and want to get hold of the corresponding hibernate object. I suppose I could parse the mapping files myself and have some kind of factory but I am hoping as these are already parsed by hibernate that there might be some mechanism through the API.

I've tried searching the forums but all the keywords I could think of were a bit too generic to get any useful results.

Thanks very much.

Hibernate version: 3.2.0-ga

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mrfox

Post subject:

Posted: Tue Jul 31, 2007 7:52 am

Newbie

Joined: Tue Jul 31, 2007 5:16 am
Posts: 9

Perhaps you find somthing in

Code:

HibernateUtil().getSessionFactory().getAllClassMetadata()

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timmgrant

Post subject:

Posted: Tue Jul 31, 2007 7:57 am

Newbie

Joined: Tue Jul 31, 2007 5:14 am
Posts: 3

mrfox wrote:

Perhaps you find somthing in

Code:

HibernateUtil().getSessionFactory().getAllClassMetadata()

Hi thanks for the reply. I tried everything I could think of on that but couldn't find anything to match against the table name - just the entity name.

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thatmikewilliams

Post subject:

Posted: Tue Jul 31, 2007 7:58 am

Expert

Joined: Fri Jul 13, 2007 8:18 am
Posts: 370
Location: london

If you have a reference to the Configuration object you can find the class and table names there:

Code:

Configuration config = new Configuration().addClass(.....);

        Iterator<RootClass> iterator = config.getClassMappings();
        while (iterator.hasNext()) {
           RootClass rootClass = iterator.next();
           System.out.println("class: " + rootClass.getClassName() + " maps to table: " + rootClass.getTable().getName());
        }

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timmgrant

Post subject:

Posted: Tue Jul 31, 2007 9:00 am

Newbie

Joined: Tue Jul 31, 2007 5:14 am
Posts: 3

thatmikewilliams wrote:

If you have a reference to the Configuration object you can find the class and table names there:

Code:

Configuration config = new Configuration().addClass(.....);

        Iterator<RootClass> iterator = config.getClassMappings();
        while (iterator.hasNext()) {
           RootClass rootClass = iterator.next();
           System.out.println("class: " + rootClass.getClassName() + " maps to table: " + rootClass.getTable().getName());
        }

Thats perfect. Thanks

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Assafp

Post subject:

Posted: Tue Jul 31, 2007 9:05 am

Newbie

Joined: Sun Apr 09, 2006 8:38 am
Posts: 14

you can also try:
1. map the class hierarchy as table-per-hierarchy scheme.
2. set the discriminator value to be the class name
2. perform a select on the discriminator column of the table
e.g. "select distinct DISC_VAL from <myTableNAme>
3. in java, do a Class.forName() on each result.

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