/// <summary>
  /// 封装同一的接口调用方法
  /// </summary>
  /// <param name="_strSql">传入的简单sql</param>
  /// <param name="_strConnNmae">连接数据库字符串</param>
  /// <returns>返回的dataset</returns>
  [WebMethod]  
  public DataSet GeneralDataSet(string _strSql, string _strConnNmae)
  {
    DataSet dsResult = null;
    //连接HIS数据库串
    ConnectionStringSettings css = new ConnectionStringSettings();
    css = ConfigurationManager.ConnectionStrings[_strConnNmae];
    using (OleDbConnection conn = new OleDbConnection(css.ConnectionString))
    {
      conn.Open();
      OleDbCommand cmd = conn.CreateCommand();
      using (OleDbDataAdapter ada = new OleDbDataAdapter())
      {
        try
        {
          cmdHIS.CommandText = _strSql;
          ada.SelectCommand = cmdHIS;
          ada.Fill(dsResult);
        }
        catch (Exception ex)
        {
        }
      }
    }
    return dsResult;
  }

<configuration>
  <appSettings>
    <add key="EmrSoapRole" value="http://www.goodwill.com/EMR"/>
  </appSettings>
  <connectionStrings>
     
    <add name="HISConnectionString" connectionString="Data Source=DLFY;Persist Security Info=True;Password=medrec;User ID=medrec" providerName="System.Data.OracleClient"/>

//调用示例
DataSet ds = GeneralDataSet("select * from emp","HisConnectionString");