DataBind Charts to EnterpriseDB Data

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EnterpriseDB ADO.NET Provider

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Use the standard ADO.NET procedures for databinding to provide bidirectional access to EnterpriseDB 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 enables bidirectional access to data from UI controls. You can use the CData ADO.NET Provider for EnterpriseDB to easily databind EnterpriseDB data to Windows Forms and Web controls in Visual Studio. This article shows how to use wizards to databind EnterpriseDB data to a chart that reflects any changes. The code walk-through section shows how to create a chart in 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

Follow the procedure below to use the Data Source Configuration Wizard to create a chart control and the connection to EnterpriseDB. In the wizard, you can select the EnterpriseDB entities you want to databind.

  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 EnterpriseDB Data Source.

    Below is a typical connection string:

    User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5444

    The following connection properties are required in order to connect to data.

    • Server: The host name or IP of the server hosting the EnterpriseDB database.
    • Port: The port of the server hosting the EnterpriseDB database.

    You can also optionally set the following:

    • Database: The default database to connect to when connecting to the EnterpriseDB Server. If this is not set, the user's default database will be used.

    Connect Using Standard Authentication

    To authenticate using standard authentication, set the following:

    • User: The user which will be used to authenticate with the EnterpriseDB server.
    • Password: The password which will be used to authenticate with the EnterpriseDB server.

    Connect Using SSL Authentication

    You can leverage SSL authentication to connect to EnterpriseDB data via a secure session. Configure the following connection properties to connect to data:

    • SSLClientCert: Set this to the name of the certificate store for the client certificate. Used in the case of 2-way SSL, where truststore and keystore are kept on both the client and server machines.
    • SSLClientCertPassword: If a client certificate store is password-protected, set this value to the store's password.
    • SSLClientCertSubject: The subject of the TLS/SSL client certificate. Used to locate the certificate in the store.
    • SSLClientCertType: The certificate type of the client store.
    • SSLServerCert: The certificate to be accepted from the server.

    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 ShipName and the y-axis to ShipCity.

  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 EnterpriseDB data. Run the chart to display the current data.

Code Walk-through

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

  1. Connect to EnterpriseDB.
  2. Create the EnterpriseDBDataAdapter 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:

EnterpriseDBConnection conn = new EnterpriseDBConnection("User=postgres;Password=admin;Database=postgres;Server=127.0.0.1;Port=5444"); EnterpriseDBCommand comm = new EnterpriseDBCommand("SELECT ShipName, ShipCity FROM Orders WHERE ShipCountry = 'USA'", conn); EnterpriseDBDataAdapter da = new EnterpriseDBDataAdapter(comm); DataSet dataset = new DataSet(); da.Fill(dataset); chart1.DataSource = dataset; chart1.Series[0].XValueMember = "ShipName"; chart1.Series[0].YValueMembers = "ShipCity"; // Insert code for additional chart formatting here. chart1.DataBind();