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Connect to XML Data from a Connection Pool in Jetty

The XML JDBC Driver supports connection pooling: This article shows how to connect faster to XML data from Web apps in Jetty.

The CData JDBC driver for XML is easy to integrate with Java Web applications. This article shows how to efficiently connect to XML data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for XML in Jetty.

Configure the JDBC Driver for Salesforce as a JNDI Data Source

Follow the steps below to connect to Salesforce from Jetty.

  1. Enable the JNDI module for your Jetty base. The following command enables JNDI from the command-line:

    java -jar ../start.jar --add-to-startd=jndi
  2. Add the CData and license file, located in the lib subfolder of the installation directory, into the lib subfolder of the context path.
  3. Declare the resource and its scope. Enter the required connection properties in the resource declaration. This example declares the XML data source at the level of the Web app, in WEB-INF\jetty-env.xml.

    <Configure id='xmldemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="xmldemo" class=""> <Arg><Ref refid="xmldemo"/></Arg> <Arg>jdbc/xmldb</Arg> <Arg> <New class="cdata.jdbc.xml.XMLDriver"> <Set name="url">jdbc:xml:</Set> <Set name="URI">C:/people.xml</Set> <Set name="DataModel">Relational</Set> </New> </Arg> </New> </Configure>

    See the Getting Started chapter in the data provider documentation to authenticate to your data source: The data provider models XML APIs as bidirectional database tables and XML files as read-only views (local files, files stored on popular cloud services, and FTP servers). The major authentication schemes are supported, including HTTP Basic, Digest, NTLM, OAuth, and FTP. See the Getting Started chapter in the data provider documentation for authentication guides.

    After setting the URI and providing any authentication values, set DataModel to more closely match the data representation to the structure of your data.

    The DataModel property is the controlling property over how your data is represented into tables and toggles the following basic configurations.

    • Document (default): Model a top-level, document view of your XML data. The data provider returns nested elements as aggregates of data.
    • FlattenedDocuments: Implicitly join nested documents and their parents into a single table.
    • Relational: Return individual, related tables from hierarchical data. The tables contain a primary key and a foreign key that links to the parent document.

    See the Modeling XML Data chapter for more information on configuring the relational representation. You will also find the sample data used in the following examples. The data includes entries for people, the cars they own, and various maintenance services performed on those cars.

  4. Configure the resource in the Web.xml:

    jdbc/xmldb javax.sql.DataSource Container
  5. You can then access XML with a lookup to java:comp/env/jdbc/xmldb: InitialContext ctx = new InitialContext(); DataSource myxml = (DataSource)ctx.lookup("java:comp/env/jdbc/xmldb");

More Jetty Integration

The steps above show how to configure the driver in a simple connection pooling scenario. For more use cases and information, see the Working with Jetty JNDI chapter in the Jetty documentation.