用AR执行sql

摘自： http://forum.castleproject.org/viewtopic.php?t=52

Hi, I got somewhat the same problem. I need to run T-SQL commands, as we are new to ActiveRecord and NHibernate, and would like a quick "workaround" when we can't find our ways

I refered to http://castleproject.org/index.php/ActiveRecord:Using_HQL and made a derived class from ActiveRecordBaseQuery.

Code:

Public Class SqlNonQuery
    Inherits ActiveRecordBaseQuery

    Private _commandText As String
    Public Property CommandText() As String
        Get
            Return _commandText
        End Get
        Set(ByVal Value As String)
            _commandText = Value
        End Set
    End Property

    Public Sub New(ByVal commandText As String)
        MyBase.New(GetType(User))

        _commandText = commandText

    End Sub

    Public Overrides Function Execute(ByVal session As NHibernate.ISession) As Object
        Dim cmd As IDbCommand = session.Connection.CreateCommand()
        cmd.CommandText = CommandText
        cmd.ExecuteNonQuery()
        Return Nothing
    End Function

End Class


''' usage '''
Dim q As SqlNonQuery("ANY SQL STATEMENT")
ExecuteQuery(q)

But still have the same problem as Nick, need to pass some arbitrary ActiveRecord class type for the ActiveRecordBaseQuery constructor.

If you have better ways, please advice.. Thanks.

---

Ok, I figured out something that works:

Code:

ISessionFactoryHolder holder = ActiveRecordMediator.GetSessionFactoryHolder();
ISession session = holder.CreateSession(typeof(User));

IDbCommand cmd = session.Connection.CreateCommand();
cmd.CommandText = "ALTER TABLE stops ALTER description TYPE text;";
cmd.ExecuteNonQuery();
            
holder.ReleaseSession(session);

However it's a lot of code, and two things that bug me are:

1) Must give CreateSession some arbitrary ActiveRecord class type (type "User" in the example)
2) GetSessionFactoryHolder() seems to be a "temporary" method, not intended to be used

---

This disscuss is old though, I post the idea to solve above problem. It maybe help someone who has same problem.

Code:

// Create query
SimpleQuery<object[]> query = new SimpleQuery<object[]>(
                typeof(TopCalled),
                @"select RecID, count(Called_Number) as frequency, Called_Number
                                       from detail_record
                                       group by Called_Number
                                       order by frequency desc");

// Execute query
object[][] results = query.Execute();

It also might work that you use TopCalled class instead of "object[]" if the class has "operator=(object[])".