CollectionMtoMDeleter.cs :  » Persistence-Frameworks » Ormyx » Ormyx » Net » Mapper » Writer » Deleter » C# / CSharp Open Source

#region Copyright (C) 2003 Yuriy Baltovskyy <bym@itcs.com.ua>
/*
* Ormyx for .NET - Object Relational Mapping
* Copyright (C) 2003 Yuriy Baltovskyy
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/
#endregion

using System;
using System.Data;
using System.Collections;
using Ormyx.Net.Metadata;
using Ormyx.Net.Sql;

namespace Ormyx.Net.Mapper.Writer.Deleter{
  /// <summary>
  /// Summary description for CollectionMtoMDeleter.
  /// </summary>
  public class CollectionMtoMDeleter : BaseFieldWriter
  {
    public CollectionMtoMDeleter(CollectionMtoMMapping collectionMtoMMapping) : 
      base(collectionMtoMMapping)
    {
    }

    public override void Process(IWriteContext processContext)
    {
      object parentObjectReferenceKey = CollectionMtoMMapping.EnclosingClassMapping.GetFieldValue(CollectionMtoMMapping.ForeignKeyField, processContext.ObjectToProcess);

      WriteStatement processStatement = new DeleteStatement(); 
      
      processStatement.AddTable(CollectionMtoMMapping.IndirectionTable);

      processStatement.AddWhereField(CollectionMtoMMapping.IndirectionPointToThisField);  
      
      processContext.SessionImplementor.ConnectionManagerImplementor.PrepareTransactionStatement(processStatement.SqlStatement, parentObjectReferenceKey).ExecuteNonQuery();
    }

    private CollectionMtoMMapping CollectionMtoMMapping
    {
      get { return FieldMapping as CollectionMtoMMapping; }
    }
  }
}