hi,

I have a HashMap() with key1, value1..key2,value2...etc
I want to map this to a relational table with columns
key1,key2,..,key n
so data inserted will be value1,value2..,val n

1 complete Hashmap ==> 1 row of table.

Could you show me how to with mapping configuration for hibernate? (.hbm.xml)

Thanks in advance.

You'd need to create your own type. This is done by implementing UserType with your own code that knows how to save and load this information the way you want it. See here:

http://www.hibernate.org/hib_docs/v3/re ... pes-custom

Thanks. That link partially helps.

Consider my scenario -->

Class Child extends Parent{
}

Class Parent{
private [u]transient[/u] Component comp1;
getters..setters..
}

Class Component{
private Component2 comp2;
getters..setters..
}

Class Component2{
private Map members;
getters..setters..
}

Now I want to transform elements of Map ( members) to columns of a row of rdbms table Parent (see thread). So I create CompositeUserType for members.

But for method
public void nullSafeSet(PreparedStatement statement,
Object value...) in
CompositeUserType is invoked with value = null.
When it should have been value = members.

The Problem is because of [u]transient[/u] Component comp1
Note that: comp1 is transient, but Im still passing this object filled with data to Hibernate.

How do I force hibernate to pass transient member to CompositeUserType.nullSafeSet?
(Can I customize the hibernate reflector & will that help?)

.hbm.xml --->

<class name="Parent" table="Parent">
<id column="typed_id" type="long">
<generator class="native"/>
</id>
<discriminator ...>

<component name="comp"
<component name="comp1"

<property name="members" type="MapCompositeUserType">
<column name="col1"/>
<column name="col2"/>
</property>

</component>
</component>

<subclass name="child"/>
</class>