学习日记：业务模型类的建立

　　业务模型的建立包含几个过程：ＣＤＭ－－＞ＰＤＭ－－＞ＤＡＴＡＢＡＳＥ－－＞ＭＯＤＥＬ．
　　先在根据需求分析，概要设计文档，用PowerDesigner设计概念模型ＣＤＭ（Ｅ－Ｒ图），后用PowerDesigner 转换为物理模型ＰＤＭ，再由ＰＤＭ生成数据库脚本（或直接导成库），然后生成库．
　　生成库后利用Castle的自动生成器生成业务模型类（Castle.ActiveRecord.Generator）．

　　举例：多对多关系业务模型类
　　
　１.CDM：People; Company 
   
　２.CDM -->PDM ：PDM自动生成 People,Company的对照表，PeopleCompany

　３.PDM --> SqlServer: People,Company，PeopleCompany
　
　４.SqlServer --> Model: 由Castle.ActiveRecord.Generator生成的MODEL，也为三个

实际的MOEDL应为2个，如
[ActiveRecord("company")]
public class Company : ActiveRecordBase
{
    private int id;
    private String name;
    private IList _people;

    public Company()
    {
    }

    public Company(string name)
    {
        this.name = name;
    }

    [PrimaryKey]
    public int Id
    {
        get { return id; }
        set { id = value; }
    }

    [Property]
    public String Name
    {
        get { return name; }
        set { name = value; }
    }

    [HasAndBelongsToMany( typeof(Person),
      Table="people_companies",
      ColumnRef="person_id", ColumnKey="company_id" )]
    public IList People
    {
        get { return _people; }
        set { _people = value; }
    }
}

[ActiveRecord("people")]
public class Person : ActiveRecordBase
{
    private int _id;
    private String _name;
    private IList _companies;

    public Person()
    {
        _companies = new ArrayList();
    }

    [PrimaryKey]
    public int Id
    {
        get { return _id; }
        set { _id = value; }
    }

    [Property]
    public string Name
    {
        get { return _name; }
        set { _name = value; }
    }

    [HasAndBelongsToMany( typeof(Company),
      Table="people_companies",
      ColumnRef="company_id", ColumnKey="person_id" )]
    public IList Companies
    {
        get { return _companies; }
        set { _companies = value; }
    }
}