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 Post subject: How to map foreign key constraints
PostPosted: Wed Jul 25, 2012 4:34 am 
Newbie

Joined: Wed Jul 25, 2012 3:33 am
Posts: 1
Hello Frnds,

My Product table have one foreign key CategoryId . I don't know how to Map this table & how to insert CategoryId into Product Table. I am Posting my Code but It gives me runtime error.

Products.hbm.xml file

Code:
<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="Test_NHibernate_Join_Tables" assembly="Test_NHibernate_Join_Tables"
                  >
  <class name="Test_NHibernate_Join_Tables.Products" table="tblProducts">
    <id name="ProductId" type="int">
      <generator class="native"/>
    </id>
    <property type="string" name="ProductName" >
      <column name="ProductName"></column>
    </property>
    <set name="Category" inverse="true" cascade="all" >
      <key column="CategoryId" />
      <one-to-many class="Test_NHibernate_Join_Tables.Products"/>
    </set>
  </class>

</hibernate-mapping>


Product.cs File

Code:

public class Products
    {

        public virtual int? ProductId { get; set; }
        Category _category;
        public virtual Category Category
        {
            get
            {
                return _category;
            }
            set
            {
                _category = value;
            }
        }
        public virtual string ProductName { get; set; }
    }


Error Getting

Unable to cast object of type 'Test_NHibernate_Join_Tables.Category' to type 'Iesi.Collections.ISet'.


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