Nhibernate教程2（3）

2）       含有关系的表的情况

 

含有关系的表指的是像学生这样，除了保存学生的基本信息，还希望把选课信息保存到学生的类中。这样情况下不能用软件来辅助产生对应的类和XML，这是NHibernate中唯一需要费脑筋学的地方。学生表对应的类和XML如下所示：

 

类文件（Student.cs）   using System;   using Iesi.Collections;   namespace CodeTest{            public class Student{                    public Student(){}                      private int studentId;                      private string studentName;                      private string studentPassword;                      private string emailAddress;                      private DateTime dateCreated;                      private ISet courses =   new HashedSet();                      public int StudentId{                               get { return studentId; }                               set { studentId = value; }                      }                      public string StudentName{                               get { return studentName; }                               set { studentName = value; }         }                      public string StudentPassword{                               get { return studentPassword; }                               set { studentPassword = value; }                   }                      public string EmailAddress{                               get { return emailAddress; }                               set { emailAddress = value; }}   public DateTime DateCreated{                               get { return dateCreated; }                               set { dateCreated = value; }}                      public ISet Courses{                               get{return courses;}                               set{courses=value;}                      }                            }   }

XML文件（Student.hbm.xml）   <?xml version="1.0" encoding="utf-8" ?>   <hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">            <class name="NHibernateTest.Student, NHibernateTest" table="Student">                      <id name="StudentId" column="StudentId" type="Int32">                               <generator class="native" />                      </id>                      <property name="StudentName" column= "StudentName" type="string" length="40"/>                      <property name="StudentPassword" type="string" length="20"/>                      <property name="EmailAddress" type="String" length="40"/>                      <property name="DateCreated" type="DateTime" length="8"/>                     <set name="Courses" table="StudentCourse" inverse="false">                      <key column="StudentID"/>                      <many-to-many column="CourseID" class=" NHibernateTest.Course, NHibernateTest "/>                      </set>   </class>   </hibernate-mapping>