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DataBind HDFS Data to the DevExpress Data Grid

Use the CData ADO.NET Provider for HDFS with the DevExpress Windows Forms and Web controls to provide HDFS data to a chart.

The CData ADO.NET Provider for HDFS implements standard ADO.NET data access components that can be used with third-party controls. The standard ADO.NET process for databinding can be followed to enable bidirectional access to live data from UI controls. In this article we show how to use the CData components to databind to the DevExpress Windows Forms and Web controls; you will databind to a chart that displays current data.

In order to authenticate, set the following connection properties:

  • Host: Set this value to the host of your HDFS installation.
  • Port: Set this value to the port of your HDFS installation. Default port: 50070

Windows Forms Controls

The code below shows how to populate a DevExpress chart with HDFS data. The HDFSDataAdapter binds to the Series property of the chart control. The Diagram property of the control defines the x- and y-axes as the column names.

using (HDFSConnection connection = new HDFSConnection( "Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;")) { HDFSDataAdapter dataAdapter = new HDFSDataAdapter( "SELECT FileId, ChildrenNum FROM Files WHERE FileId = '119116'", connection); DataTable table = new DataTable(); dataAdapter.Fill(table); DevExpress.XtraCharts.Series series = new DevExpress.XtraCharts.Series(); chartControl1.Series.Add(series); series.DataSource = table; series.ValueDataMembers.AddRange(new string[] { "ChildrenNum" }); series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative; series.ArgumentDataMember = "FileId"; series.ValueScaleType = DevExpress.XtraCharts.ScaleType.Numerical; chartControl1.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False; ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true; }

Web Controls

The code below shows how to populate a DevExpress Web control with HDFS data. The HDFSDataAdapter binds to the Series property of the chart; the Diagram property defines the x- and y-axes as the column names.

using DevExpress.XtraCharts; using (HDFSConnection connection = new HDFSConnection( "Host=sandbox-hdp.hortonworks.com;Port=50070;Path=/user/root;User=root;")) { HDFSDataAdapter HDFSDataAdapter1 = new HDFSDataAdapter("SELECT FileId, ChildrenNum FROM Files WHERE FileId = '119116'", connection); DataTable table = new DataTable(); HDFSDataAdapter1.Fill(table); DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar); WebChartControl1.Series.Add(series); series.DataSource = table; series.ValueDataMembers.AddRange(new string[] { "ChildrenNum" }); series.ArgumentScaleType = ScaleType.Qualitative; series.ArgumentDataMember = "FileId"; series.ValueScaleType = ScaleType.Numerical; ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true; }