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Minggu, 26 September 2010

Linq to NHibernate

My previous codes show the use of NHibernate and Fluent NHibernate as OR/M with .NET framework. Next, I would refer to Fluent NHibernate and use Linq.

1. Download NHibernate.Linq-2.1.2-GA-Bin to get NHibernate.Linq.dll.
2. Add reference to NHibernate.Linq.dll in this file that we work with, and in the beginning add using NHibernate.Linq;
3. At line 43, add this:

var x = (from p in session.Linq<Personal>() where p.Member== "Y" select p).Take(5);
Console.WriteLine("Output #1:");
foreach (var a in x)
Console.WriteLine("id= {0}, ket= {1}", a.Id, a.Sex);

var r = from p in session.Linq<Personal>()
group p by p.Sex into g
select new { sex = g.Key, count = g.Count() };
Console.WriteLine("Output #2:");
foreach (var a in r)
Console.WriteLine("Sex = {0}, Count= {1}", a.sex, a.count);

4. In this sample, I add a new table and make mapping to database.

public class Personal
{
public virtual string Id { get; private set; }
public virtual string Member { get; set; }
public virtual string Sex { get; set; }
}

public class PersonalMap : ClassMap<Personal>
{
public PersonalMap()
{
Table("employees");
Id(x => x.Id).Column("pk");
Map(x => x.Member, "member");
Map(x => x.Sex, "sex");
}
}

Below the output, and it's time for me to sleep....good morning..

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