Question

Hibernate - Table with no ID

Asked by: dberner9

Quick question - what do I do for the <id> tag in the (class).hbm.xml file if the table I'm trying to connect to is a view and thus has no indices?

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Asked On
2005-10-07 at 08:39:48ID21587412
Tags

hibernate

,

id

,

table

Topics

Java Programming Language

,

Extensible HTML (XHTML)

Participating Experts
3
Points
0
Comments
5

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Answers

 

by: actonwangPosted on 2005-10-07 at 08:53:50ID: 15039764

  simply set it as <id name="<your name>" type="string<or other type>" />

   Hibernate will treat view as table except you don't do insert and update on that in the program.

 

by: matthewdflemingPosted on 2005-10-11 at 13:54:09ID: 15064446

You might want to make your objects immutable.. in the <Class> element set the mutable attribute to false. Also check out
http://www.hibernate.org/hib_docs/v3/reference/en/html/mapping.html#mapping-declaration-class

Read the section (6.1.4. id)

Also right above this section:
There is no difference between a view and a base table for a Hibernate mapping, as expected this is transparent at the database level (note that some DBMS don't support views properly, especially with updates). Sometimes you want to use a view, but can't create one in the database (ie. with a legacy schema). In this case, you can map an immutable and read-only entity to a given SQL subselect expression...

 

by: dberner9Posted on 2005-10-17 at 10:24:08ID: 15101257

Thanks... Hibernate's cfg2hbm tool uses the entire table as PK.  This seems to be the best solution... because using an extra column causes problems in hibernate.

 

by: Computer101Posted on 2006-01-02 at 05:46:07ID: 15591126

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