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Nhibernate教程2（3）

發布時間：2023/12/10 编程问答 25 豆豆

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2）?????? 含有關系的表的情況

含有關系的表指的是像學生這樣，除了保存學生的基本信息，還希望把選課信息保存到學生的類中。這樣情況下不能用軟件來輔助產生對應的類和XML，這是NHibernate中唯一需要費腦筋學的地方。學生表對應的類和XML如下所示：

類文件（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>

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