DataBind Impala Data to the DevExpress Data Grid

The ADO.NET Provider for Impala by CData incorporates conventional ADO.NET data access components compatible with third-party controls. You can adhere to the standard ADO.NET data binding procedures to establish two-way access to real-time data through UI controls. This article will demonstrate the utilization of CData components for data binding with DevExpress UI Controls (Windows Forms and Web controls), specifically binding to a chart that visualizes live 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;
}