Question

I’m using Hibernate tools 3.40 in Eclipse (Helios).
I’m trying to generate POJOs from my DB (MSSQL 2008) with EJB3 style (i.e. JPA2.0 annotations).
Let’s say I have two tables A and B where there is a foreign key from A to B.
This generates, by default, a POJO for A which has B as a member (its “parent”) and a POJO for B which has a Set<A> as a member (its “children”).
What I’d like is to know how I can control the rev-eng so that only one side of the association is created (I have different use cases so basically all three options are important for me).
I do not want to use hbm.xml files as I’m working with annotations and JPA2.0 but I can specify some metadata on the reverse engineering process to hibernate via hibernae.reveng.xml

I’ve tried configuring the foreign-key attribute and defining there the exclude=true but that only provided me with a half an answer for one scenario. That generated an A POJO with a bPK int member which is tolerable and understandable but the generated POJO of B now does not compile as the one-to-many annotation has an invalid attribute; The mappedby="unresolved" due to the fact that A no longer has a property which hibernate reveng can map back to.

So, I currently cannot create uni-directional associations and I’d appreciate any help.

Answer 1

Create a class for reveng. strategy at Hibernate Code Generation Configuration

Example :

public class MyReverseEngineeringStrategy extends DelegatingReverseEngineeringStrategy {

   public MyReverseEngineeringStrategy(ReverseEngineeringStrategy delegate) {
       super(delegate);
   }

   @Override
   public void setSettings(ReverseEngineeringSettings settings) {
       super.setSettings(settings);
   }

   @Override
   public boolean excludeForeignKeyAsCollection(String keyname, 
    TableIdentifier fromTable, java.util.List fromColumns, 
    TableIdentifier referencedTable, java.util.List referencedColumns) {

    // TODO : Your work here
    if (keyname.equals("___") && 
        fromTable.getName().equals("___") && 
        fromColumns.contains("___") && 
        referencedTable.getName().equals("___") && 
        referencedColumns.contains("___")) {

        return true;
    }

    return false;
   }
}

JavaDoc for method excludeForeignKeyAsCollection

Should this foreignkey be excluded as a oneToMany 

and there also have another method call excludeForeignKeyAsManytoOne

Should this foreignkey be excluded as a many-to-one