NHibernate

Konfigurationsdatei Sample

sqlserver sample

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
  <session-factory>
    <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
    <property name="dialect">NHibernate.Dialect.MsSql2008Dialect</property>
    <property name="connection.driver_class">NHibernate.Driver.SqlClientDriver</property>
    <property name="connection.connection_string">Server=(local);Database=nhibernate;Trusted_Connection=true;</property>
    <property name="show_sql">true</property>
  </session-factory>
</hibernate-configuration>

Mysql example

<?xml version="1.0" encoding="utf-8" ?>
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog"/>
    <section name="hibernate-configuration" type="NHibernate.Cfg.ConfigurationSectionHandler, NHibernate" />
  </configSections>
  <appSettings>
    <add key="loglevel" value="info"/>
    <add key="logimplementation" value="NLOG"/>
    <add key="exportdirectory" value="/tmp" />
  </appSettings>
  <connectionStrings>
    <add name="testmasterconnection"
         connectionString="server=localhost;user=root;pwd=dukannstmichmal;database=mydb;port=3306;"
         providerName="MySql.Data.MySqlClient" />
  </connectionStrings>

  <hibernate-configuration xmlns="urn:nhibernate-configuration-2.2">
    <session-factory>
      <property name="connection.provider">NHibernate.Connection.DriverConnectionProvider</property>
      <property name="dialect">NHibernate.Dialect.MySQL5Dialect</property>
      <property name="connection.connection_string_name">testmasterconnection</property>
      <property name="show_sql">true</property>
      <property name="hbm2ddl.keywords">none</property>
    </session-factory>
  </hibernate-configuration>

  <nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

    <targets>
      <target name="logfile" xsi:type="File" fileName="out.txt" />
      <target name="console" xsi:type="Console" />
    </targets>

    <rules>
      <logger name="*" minLevel="Info" writeTo="logfile" />
      <logger name="*" minLevel="Info" writeTo="console" />
      <logger name="TagsManagement" minLevel="Debug" writeTo="console" />
    </rules>

  </nlog>
</configuration>

many to many mapping

Mapping:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
                   assembly="ConsoleApplication2"
                   namespace="ConsoleApplication2">

  <class name="MyItem">
    
    <id name="ID" generator="native"/>
    
    <property name="Name" />

    <!-- Many-to-many mapping: OrderItems -->
    <bag name="Tags" 
         table="MyItem_MyTag" 
         cascade="none" 
         lazy="true">
      <key column ="MyItemID" />
      <many-to-many class="MyTag" column="MyTagID" />
    </bag>
    
  </class>

</hibernate-mapping>

Klasse:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    public class MyItem
    {
        public virtual string Name { get; set; }
        public virtual int ID { get; set; }

        IList<MyTag> _tags = new List<MyTag>();
        public virtual IList<MyTag> Tags {
            get
            {
                return this._tags;
            }
            set
            {
                _tags = value;
            }
        }
    }
}

Konfiguration mit fluet configuration

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NHibernate.Cfg;
using FluentNHibernate.Cfg;
using FluentNHibernate.Cfg.Db;
using NHibernate;

namespace ConsoleApplication2
{
    class Program
    {

        /// <summary>
        /// 
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            try
            {

                var sessionFactory = Fluently.Configure()
                                             .Database(
                                                    MsSqlConfiguration.MsSql2005
                                                                      .ConnectionString(
"Server=(local);Database=nhibernate;Trusted_Connection=true;")
                                                                      .ShowSql()
                                              )
                                             .Mappings(m => m
                                             .FluentMappings.AddFromAssemblyOf<Program>())
                                             .BuildSessionFactory();

                ISession session = sessionFactory.OpenSession();



                ...
                  
            }
            catch (Exception e)
            {
                Console.Write(e.Message);
            }
        }
    }
}

using FluentNHibernate.Mapping;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2.Mappings
{
    class MyItemMap : ClassMap<MyItem>
    {
        public MyItemMap()
        {
            Id(x => x.ID).GeneratedBy.Native();

            Map(x => x.Name);

            HasManyToMany(x => x.Tags)
                .Table("MyItem_MyTag")
                .ParentKeyColumn("MyItemID")
                .ChildKeyColumn("MyTagID")
                .Cascade.None().LazyLoad();

        }
    }
}

Wenn Fremdschlüssel kein Constraint aufweist:

 //Cache einschalten:
 Cache.ReadOnly().Region("Keep15Min");

 //Fremdschlüssel ohne Fremdschlüsselconstraint
 References(x => x.Verantwortlicher, "strVerantwortlicher").Nullable()
                .ForeignKey("FK_Vertrag_Verantwortlicher_Employee")
                .Index("IX_strVerantwortlicherId")
                .NotFound.Ignore()
                .Access.CamelCaseField(Prefix.Underscore);

Queries

OR, Criteria

var query = context.Session.CreateCriteria<Tag>();

query.Add(Restrictions.Or(
    
  Restrictions.Where<Tag>(t => t.NameDe.IsLike(searchString)),
    
  Restrictions.Where<Tag>(t => t.NameEn.IsLike(searchString))));
              

return query.List<Tag>();              


HQL, Latest related object

select item, tag
from MyItem item
    join item.Tags tag
where tag.Id = (                                    
    select  max(tag2.Id)  
    from MyItem item2
        join item2.Tags tag2
    where item2.Id = item.Id
    group by item2.Id     
)

OR, Query Over

using (DbContext context = new DbContext())
{

    Tag tag = null;

    return context.Session.QueryOver<Tag>()
        .Where(t => t.NameDe.IsLike(searchString) || t.NameEn.IsLike(searchString))
        .SelectList(
        list => list.Select(x => x.Id).WithAlias(() => tag.Id)
                    .Select(x => x.NameDe).WithAlias(() => tag.NameDe)
                    .Select(x => x.NameEn).WithAlias(() => tag.NameEn))
                .TransformUsing(Transformers.AliasToBean<Tag>()).List<Tag>();
}          


Updates

Keine Änderung an der Datenbank:

ISession session = sessionFactory.OpenSession();
MyTag tag = session.Get<MyTag>(17);
tag.Name = "Furunkel";
session.Close();

Ohne Transaktion kein Update.

Änderung an der Datenbank ohne Save:

ISession session = sessionFactory.OpenSession();
ITransaction tx = session.BeginTransaction();
MyTag tag = session.Get<MyTag>(17);
tag.Name = "Furunkel";
tx.Commit(); //Schreibt die Änderung in die DB.

Save:

ISession session = sessionFactory.OpenSession();
ITransaction tx = session.BeginTransaction();
MyTag tag = new MyTag();
tag.Name = "test";
session.Save(tag); //Insert Statement wird hier zur DB ausgegeben. Id von db wird hier gelöst.
tx.Commit();
              
session.Close();

resourcen

• http://nhforge.org/doc/nh/en/index.html