Hi,
i am a new user of NHibernate.
I have a problem with Cascade Update on 1-Many relations.
How do i implement it? I have 2 tables:
Customers:
CustomerID-nchar(5)-Primary Key,
CompanyName-nvarchar(40),
ContactName-nvarchar(30)-Unique Key,
Address-nvarchar(60)
City-nvarchar(15)
Region-nvarchar(15)
PostalCode-nvarchar(10)

Orders
OrderID-GUID-PrimaryKEy
CustomerID-Foreign Key ref Customers(CustomerID)
OrderDate
ShippedDate
ShipAddress
SHipCity
ShipRegion
ShipPostalCode
CustName-ref Customers(ContactName)

If i update the Parent table Customers i need the child table also to be updated i.e if i update the ContactName in Customers table then i need the CustName in Orders table also be updated for the respective CustomerID.
Please let me know how do i do it?
Here is my Customers.hbm.xml file

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="nhibernator.BLL.Customer, nhibernator" table="Customers">
<!-- map the id field -->
<composite-id>
<key-property name="CustomerID" column="CustomerID" type="String" length="20">
<generator class="assigned" />
</key-property>
<key-property name="ContactName" column="ContactName" type="String">
<generator class="assigned" />
</key-property>
</composite-id>
<!-- Map properties I'd like to persist/fetch, assume column = propery name, and type is determined by reflection -->
<property name="CompanyName"/>
<property name="Address"/>
<property name="City"/>
<property name="Region"/>
<property name="PostalCode"/>
<!-- Orders collection, pull customer orders but, loading lazy to minimize load time, resource usage. -->
<!--<set name="Details" cascade="all" table="CustomerDetails" lazy="true">
<key column="CustomerID"/>
<one-to-many class="nhibernator.BLL.Details, nhibernator"/>
</set>-->
<bag name="Orders" cascade="all" lazy="true">
<key column="CustomerID"/>
<one-to-many class="nhibernator.BLL.Order, nhibernator"/>
</bag>
</class>
</hibernate-mapping>


Here is my Orders.hbm.xml file
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="nhibernator.BLL.Order, nhibernator" table="Orders">
<id name="OrderID" type="Int32" unsaved-value="0">
<generator class="identity" />
</id>
<property name="CustomerID" length="20"/>
<property name="OrderDate" type="DateTime"/>
<property name="ShippedDate" type="DateTime"/>
<property name="ShipName"/>
<property name="ShipAddress"/>
<property name="ShipCity"/>
<property name="ShipRegion"/>
<property name="ShipPostalCode"/>
<set name="Products" table="[Order Details]">
<key column="OrderID"/>
<many-to-many class="nhibernator.BLL.Product, nhibernator" column="ProductID"/>
</set>
<!--<many-to-one name="OCustomer" class="nhibernator.BLL.Customer,nhibernator" column="CustomerID"/>-->
</class>
</hibernate-mapping>


Please let me know what changes should i make to make it work.

Can you post the code you are executing? And tell us how you know that it doesn't work?