I need help in finishing a hbm file for the following scenario:

Table: Customer
Columns: customer_id, customer_name, start_date and end_date
Primary key: customer_id, customer_name and start_date

public class Customer {
private String customerId;
private String customerName;
private DateRange dateRange;
}

public class DateRange {
private Date startDate;
private Date endDate;
}


HBM file:

<class name="Customer" table="Customer">
<composite-id>
<key-property name="customerId" column="customer_id"/>
<key-property name="customerName" column="customer_name"
</composite-id>
</class>


How do i specify start_date as part of the key?

The start date will be part of the composite-id mapping and would be done this way:

<class name="Customer" table="Customer">
<composite-id>
<key-property name="customerId" column="customer_id"/>
<key-property name="customerName" column="customer_name" />
<key-property name="start_date " column="start_date " type="timestamp"/>
</composite-id>
</class>

Thanks teeman7 for the response.

That is correct if start date was in customer class. In my example date's are in different class than other columns on the table, how would i do it then?