对于IBatisnet执行查询返回DataTable，网上有很多代码，下面简单列出一下：

private IDbCommand GetDbCommand(string statementName, object paramObject)
        {
            IStatement statement = sqlMap.GetMappedStatement(statementName).Statement;

            IMappedStatement mapStatement = sqlMap.GetMappedStatement(statementName);

            IDalSession session = new SqlMapSession(sqlMap);

            if (sqlMap.LocalSession != null)
            {
                session = sqlMap.LocalSession;
            }
            else
            {
                session = sqlMap.OpenConnection();
            }

            RequestScope request = statement.Sql.GetRequestScope(mapStatement, paramObject, session);

            mapStatement.PreparedCommand.Create(request, session, statement, paramObject);

            return request.IDbCommand;

        }


        /// <summary>
        /// 通用的以DataTable的方式得到Select的结果(xml文件中参数要使用$标记的占位参数)
        /// </summary>
        /// <param name="statementName">语句ID</param>
        /// <param name="paramObject">语句所需要的参数</param>
        /// <returns>得到的DataTable</returns>
        protected DataTable ExecuteQueryForDataTable(string statementName, object paramObject)
        {
            DataSet ds = new DataSet();
            bool isSessionLocal = false;
            IDalSession session = sqlMap.LocalSession;
            if (session == null)
            {
                session = new SqlMapSession(sqlMap);
                session.OpenConnection();
                isSessionLocal = true;
            }

            IDbCommand cmd = GetDbCommand(statementName, paramObject);

            try
            {
                cmd.Connection = session.Connection;
                IDbDataAdapter adapter = session.CreateDataAdapter(cmd);
                adapter.Fill(ds);
            }
            finally
            {
                if (isSessionLocal)
                {
                    session.CloseConnection();
                }
            }

            return ds.Tables[0];

        }

/// <summary>
        /// 通用的以DataTable的方式得到Select的结果(xml文件中参数要使用$标记的占位参数)
        /// </summary>
        /// <param name="statementName">语句ID</param>
        /// <param name="paramObject">语句所需要的参数</param>
    /// <param name="htOutPutParameter)">Output参数值哈希表</param>
        /// <returns>得到的DataTable</returns>
        protected DataTable ExecuteQueryForDataTable(string statementName, object paramObject, out Hashtable htOutPutParameter)
        {
            DataSet ds = new DataSet();
            bool isSessionLocal = false;
            IDalSession session = sqlMap.LocalSession;
            if (session == null)
            {
                session = new SqlMapSession(sqlMap);
                session.OpenConnection();
                isSessionLocal = true;
            }

            IDbCommand cmd = GetDbCommand(statementName, paramObject);

            try
            {
                cmd.Connection = session.Connection;
                IDbDataAdapter adapter = session.CreateDataAdapter(cmd);
                adapter.Fill(ds);
            }
            finally
            {
                if (isSessionLocal)
                {
                    session.CloseConnection();
                }
            }

            foreach (IDataParameter parameter in cmd.Parameters)
            {
                if (parameter.Direction == ParameterDirection.Output)
                {
                    htOutPutParameter[parameter.ParameterName] = parameter.Value;
                }
            }

            return ds.Tables[0];

        }