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Impala ADO.NET Provider
Rapidly create and deploy powerful .NET applications that integrate with Impala.
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 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;
}
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