NHibernateで外部キー関係を持つ2つのテーブルをマップするには？

Question

連絡先とPhone__numberの2つの表があります。 Phone_numberには、の連絡先のidの外部キーであるcontact_id列が含まれています。 Nhibernateでこれらの2つのテーブルをどのようにマッピングすれば、連絡先クラスのPhoneNumbersのリストを取得できますか。

Answer 1

ドメインクラス：

public class Contact 
{ 
    public virtual int Id { get; set; } 
    public virtual string Name { get; set; } 
    public virtual IList<Phone> Phones { get; set; } 
} 

public class Phone 
{ 
    public virtual int Id { get; set; } 
    public virtual string Number { get; set; } 
} 

とそれらに対応するマッピング：

using System; 
using System.Collections.Generic; 
using System.Data; 
using System.IO; 
using FluentNHibernate.Cfg; 
using FluentNHibernate.Cfg.Db; 
using FluentNHibernate.Mapping; 
using NHibernate; 

class Program 
{ 
    static void Main(string[] args) 
    { 
     if (File.Exists("data.db3")) 
     { 
      File.Delete("data.db3"); 
     } 

     using (var factory = CreateSessionFactory()) 
     { 
      // Create schema and insert sample data 
      using (var connection = factory.ConnectionProvider.GetConnection()) 
      { 
       ExecuteQuery("create table contacts(cnt_id int, cnt_name string)", connection); 
       ExecuteQuery("create table phones(pho_id int, pho_number string, contact_id int)", connection); 
       ExecuteQuery("insert into contacts (cnt_id, cnt_name) values (1, 'Contact 1')", connection); 
       ExecuteQuery("insert into phones (pho_id, pho_number, contact_id) values (1, '12345A', 1)", connection); 
       ExecuteQuery("insert into phones (pho_id, pho_number, contact_id) values (2, '12345B', 1)", connection); 
       ExecuteQuery("insert into phones (pho_id, pho_number, contact_id) values (3, '12345C', 1)", connection); 
       ExecuteQuery("insert into phones (pho_id, pho_number, contact_id) values (4, '12345D', 1)", connection); 
      } 

      using (var session = factory.OpenSession()) 
      using (var tx = session.BeginTransaction()) 
      { 
       var contact = session.Get<Contact>(1); 
       foreach (var phone in contact.Phones) 
       { 
        Console.WriteLine(phone.Number); 
       } 
       tx.Commit(); 
      } 
     } 
    } 

    private static ISessionFactory CreateSessionFactory() 
    { 
     return Fluently.Configure() 
      .Database(
       SQLiteConfiguration.Standard.UsingFile("data.db3").ShowSql() 
      ) 
      .Mappings(
       m => m.FluentMappings.AddFromAssemblyOf<Program>() 
      ) 
      .BuildSessionFactory(); 
    } 

    static void ExecuteQuery(string sql, IDbConnection connection) 
    { 
     using (var command = connection.CreateCommand()) 
     { 
      command.CommandText = sql; 
      command.ExecuteNonQuery(); 
     } 
    } 
} 

public class Phone 
{ 
    public virtual int Id { get; set; } 
    public virtual string Number { get; set; } 
} 

public class Contact 
{ 
    public virtual int Id { get; set; } 
    public virtual string Name { get; set; } 
    public virtual IList<Phone> Phones { get; set; } 
} 

public class PhoneMap : ClassMap<Phone> 
{ 
    public PhoneMap() 
    { 
     WithTable("phones"); 
     Id(x => x.Id, "pho_id"); 
     Map(x => x.Number, "pho_number"); 
    } 
} 

public class ContactMap : ClassMap<Contact> 
{ 
    public ContactMap() 
    { 
     WithTable("contacts"); 
     Id(x => x.Id, "cnt_id"); 
     Map(x => x.Name, "cnt_name"); 
     HasMany<Phone>(x => x.Phones) 
      .WithForeignKeyConstraintName("contact_id") 
      .AsBag(); 
    } 
} 

：

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
    namespace="MyNamespace" assembly="MyAssembly" 
    default-lazy="true"> 
    <class name="Phone" table="Phone__number"> 
    <id name="Id" column="pho_id" unsaved-value="0"> 
     <generator class="native" /> 
    </id> 
    <property name="Number" column="pho_number" /> 
    </class> 
</hibernate-mapping> 

<?xml version="1.0" encoding="utf-8" ?> 
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" 
    namespace="MyNamespace" assembly="MyAssembly" 
    default-lazy="true"> 
    <class name="Contact" table="Contact"> 
    <id name="Id" column="cnt_id" unsaved-value="0"> 
     <generator class="native" /> 
    </id> 
    <property name="Name" column="cnt_name" /> 
    <bag name="Phones"> 
     <key column="contact_id" /> 
     <one-to-many class="Phone" /> 
    </bag> 
    </class> 
</hibernate-mapping> 

またはあなたのマッピングを表現するfluent方法を好む場合