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DataBind Charts to DB2 Data


Use the standard ADO.NET procedures for databinding to provide bidirectional access to DB2 data from controls in the Visual Studio toolbox. This article demonstrates a graphical approach using wizards in Visual Studio, as well as how to databind with only a few lines of code.

DataBinding facilitates two-way interaction with data through UI controls. Using the CData ADO.NET Provider for DB2 streamlines the process of binding DB2 data to Windows Forms and Web controls within Visual Studio. In this article, we will demonstrate using wizards to establish a binding between DB2 data and a chart that dynamically updates. Additionally, the code walk-through section will guide you through the creation of a chart using just 10 lines of code.

DataBind to a Chart

DataBinding consists of three steps: Instantiate the control, configure the data source, and databind.

Configure the Connection and Select Database Objects

To create a chart control and establish a connection to DB2, follow the steps outlined below using the Data Source Configuration Wizard. Within the wizard, you'll have the option to choose the specific DB2 entities you wish to bind to.

  1. In a Windows Forms project, drag and drop a Chart control from the toolbox to the form. In the Data section of the Chart properties, select DataSource and then select Add Project Data Source from the menu.
  2. In the Data Source Configuration Wizard that appears, select Database -> Dataset.
  3. In the Choose Your Data Connection step, click New Connection.

  4. In the Add Connection dialog, click Change to select the CData DB2 Data Source.

    Below is a typical connection string:

    Server=10.0.1.2;Port=50000;User=admin;Password=admin;Database=test;

    Set the following properties to connect to DB2:

    • Server: Set this to the name of the server running DB2.
    • Port: Set this to the port the DB2 server is listening on.
    • Database: Set this to the name of the DB2 database.
    • User: Set this to the username of a user allowed to access the database.
    • Password: Set this to the password of a user allowed to access the database.

    You will also need to install the corresponding DB2 driver:

    • Windows: Install the IBM Data Server Provider for .NET.

      On Windows, installing the IBM Data Server Provider is sufficient, as the installation registers it in the machine.config.

    • Java: Install the IBM Data Server Driver for JDBC.

      In the Java version, place the IBM Data Server Driver JAR in the www\WEB-INF\lib\ folder for this application.

    When you configure the connection, you may also want to set the Max Rows connection property. This will limit the number of rows returned, which is especially helpful for improving performance when designing reports and visualizations.

  5. Choose the database objects you want to work with. This example uses the Orders table.

DataBind

After adding the data source and selecting database objects, you can bind the objects to the chart. This example assigns the x-axis to OrderName and the y-axis to Freight.

  1. In the Chart properties, click the button in the Series property to open the Series Collection Editor.
  2. In the Series properties, select the columns you want for the x- and y-axes: Select columns from the menu in the XValueMember and YValueMember properties.

The chart is now databound to the DB2 data. Run the chart to display the current data.

Code Walk-through

DataBinding to DB2 data requires only a few lines of code and can be completed in three easy steps.

  1. Connect to DB2.
  2. Create the DB2DataAdapter to execute the query and create a DataSet to be filled with its results.
  3. DataBind the result set to the chart.

Below is the complete code:

DB2Connection conn = new DB2Connection("Server=10.0.1.2;Port=50000;User=admin;Password=admin;Database=test;"); DB2Command comm = new DB2Command("SELECT Orders.Freight, Customers.ContactName FROM Customers INNER JOIN Orders ON Customers.CustomerId=Orders.CustomerId", conn); DB2DataAdapter da = new DB2DataAdapter(comm); DataSet dataset = new DataSet(); da.Fill(dataset); chart1.DataSource = dataset; chart1.Series[0].XValueMember = "OrderName"; chart1.Series[0].YValueMembers = "Freight"; // Insert code for additional chart formatting here. chart1.DataBind();