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DataBind Impala Data to the DevExpress Data Grid

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

The CData ADO.NET Provider for Impala 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 connect to Apache Impala, set the Server, Port, and ProtocolVersion. You may optionally specify a default Database. To connect using alternative methods, such as NOSASL, LDAP, or Kerberos, refer to the online Help documentation.

Windows Forms Controls

The code below shows how to populate a DevExpress chart with Impala data. The ApacheImpalaDataAdapter 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 (ApacheImpalaConnection connection = new ApacheImpalaConnection( "Server=127.0.0.1;Port=21050;")) { ApacheImpalaDataAdapter dataAdapter = new ApacheImpalaDataAdapter( "SELECT City, CompanyName FROM Customers WHERE Country = 'US'", 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[] { "CompanyName" }); series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative; series.ArgumentDataMember = "City"; 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 Impala data. The ApacheImpalaDataAdapter 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 (ApacheImpalaConnection connection = new ApacheImpalaConnection( "Server=127.0.0.1;Port=21050;")) { ApacheImpalaDataAdapter ApacheImpalaDataAdapter1 = new ApacheImpalaDataAdapter("SELECT City, CompanyName FROM Customers WHERE Country = 'US'", connection); DataTable table = new DataTable(); ApacheImpalaDataAdapter1.Fill(table); DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar); WebChartControl1.Series.Add(series); series.DataSource = table; series.ValueDataMembers.AddRange(new string[] { "CompanyName" }); series.ArgumentScaleType = ScaleType.Qualitative; series.ArgumentDataMember = "City"; series.ValueScaleType = ScaleType.Numerical; ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true; }
 
 
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