IBatisNet中返回DataTable的实现

//返回IDbCommand的函数
private IDbCommand GetDbCommand(string statementName,object parameterObject)
  {
   IDbCommand p_command;
   IBatisNet.Common.IDalSession m_sqlSession;

   SqlMapper sqlMap = GetLocalSqlMap();
   if (sqlMap.LocalSession != null)
   {
    m_sqlSession = sqlMap.LocalSession;
   }
   else
   {
    m_sqlSession = sqlMap.OpenConnection();
   }
    IMappedStatement mappedStatement = GetLocalSqlMap().GetMappedStatement(statementName);
    RequestScope requestScope = mappedStatement.Statement.Sql.GetRequestScope(parameterObject, m_sqlSession);
   // 通过这个方法生成一个DbCommand，并且给所有的SQL参数指定值。如果没有调用此方法，requestScope.IDbCommand属性为空  //
   mappedStatement.PreparedCommand.Create(requestScope,
    m_sqlSession, mappedStatement.Statement, parameterObject);
   p_command = requestScope.IDbCommand;
   return p_command;
  }
//实现返回DataSet的函数
protected DataSet ExecuteQueryTable(string statementName,object parameterObject)
  {
   DataSet ds = new DataSet();
   SqlMapper sqlMap = GetLocalSqlMap();
   IDbCommand cmd = GetDbCommand(statementName,parameterObject);
   cmd.CommandType = CommandType.Text;
   cmd.CommandText = this.GetSql(statementName,parameterObject);
   if (sqlMap.LocalSession != null)
   {
    IDbDataAdapter adapter =
     sqlMap.LocalSession.CreateDataAdapter(cmd);
    adapter.Fill(ds);
    return ds;
   }
   else
   {
    IDalSession session = sqlMap.OpenConnection();
    IDbDataAdapter adapter =
     session.CreateDataAdapter(cmd);
    adapter.Fill(ds);
    session.CloseConnection();
    return ds;
   }
  }