JPA - EntityManager - createQuery - Inheritance

Question

I'm quite new to JPA and I need support on query syntax.
I have an abstract entity:
@MappedSuperclass
public abstract class HACCP implements Serializable {
}and more than one concrete implementations used to differentiate the DB table where data are stored
@Entity
@Table(schema = "dbo", name = "haccp_01")
public class HACCP01 extends HACCP {
@Entity
@Table(schema = "dbo", name = "haccp_02")
public class HACCP02 extends HACCP {
}I want to use only one service to execute CRUD functionalities.
When I retrieve data using the find method of the EntityManager everithing works fine:
em.find(HACCP.class, id);and at runtime the concrete class identifies the correct DB table.
Now I need to write my own query with a where clause
Query query = getEntityManager().createQuery( "select p FROM HACCP p WHERE [...]");obviously forcing the name of the table is not what I want!
How shold I write the query?
Edited by: mbm63 on Aug 1, 2008 11:52 AM

Answer 1

Solved!
I just get the runtime simple name of the argument class and build the query using it:
public HACCP retrieveCurrent(HACCP haccp) {
   Query query = getEntityManager().createQuery( "select p FROM " + haccp.getClass().getSimpleName() + " p WHERE [...]");
}