DataBind Oracle Data to the DevExpress Data Grid

The ADO.NET Provider for Oracle 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.

To connect to Oracle, you'll first need to update your PATH variable and ensure it contains a folder location that includes the native DLLs. The native DLLs can be found in the lib folder inside the installation directory. Once you've done this, set the following to connect:

• Port: The port used to connect to the server hosting the Oracle database.
• User: The user Id provided for authentication with the Oracle database.
• Password: The password provided for authentication with the Oracle database.
• Service Name: The service name of the Oracle database.

Windows Forms Controls

The code below shows how to populate a DevExpress chart with Oracle data. The OracleOCIDataAdapter 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 (OracleOCIConnection connection = new OracleOCIConnection(
"User=myuser;Password=mypassword;Server=localhost;Port=1521;")) {
  OracleOCIDataAdapter dataAdapter = new OracleOCIDataAdapter(
  "SELECT CompanyName, City 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[] { "City" });
  series.ArgumentScaleType = DevExpress.XtraCharts.ScaleType.Qualitative;
  series.ArgumentDataMember = "CompanyName";
  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 Oracle data. The OracleOCIDataAdapter 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 (OracleOCIConnection connection = new OracleOCIConnection(
"User=myuser;Password=mypassword;Server=localhost;Port=1521;"))
{
  OracleOCIDataAdapter OracleOCIDataAdapter1 = new OracleOCIDataAdapter("SELECT CompanyName, City FROM Customers WHERE Country = US", connection);
  DataTable table = new DataTable();
  OracleOCIDataAdapter1.Fill(table);
  DevExpress.XtraCharts.Series series = new Series("Series1", ViewType.Bar);
  WebChartControl1.Series.Add(series);
  series.DataSource = table;
  series.ValueDataMembers.AddRange(new string[] { "City" });
  series.ArgumentScaleType = ScaleType.Qualitative;
  series.ArgumentDataMember = "CompanyName";
  series.ValueScaleType = ScaleType.Numerical;
  ((DevExpress.XtraCharts.SideBySideBarSeriesView)series.View).ColorEach = true;
}