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Connect to HPCC Systems Data from a Connection Pool in Jetty

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

The CData JDBC driver for HPCC Systems is easy to integrate with Java Web applications. This article shows how to efficiently connect to HPCC Systems data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for HPCC Systems 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 HPCC Systems data source at the level of the Web app, in WEB-INF\jetty-env.xml.

    <Configure id='hpccdemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="hpccdemo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="hpccdemo"/></Arg> <Arg>jdbc/hpccdb</Arg> <Arg> <New class="cdata.jdbc.hpcc.HPCCDriver"> <Set name="url">jdbc:hpcc:</Set> <Set name="URL">http://127.0.0.1:8510</Set> <Set name="User">test</Set> <Set name="password">xA123456</Set> <Set name="Version">1</Set> <Set name="Cluster">hthor</Set> </New> </Arg> </New> </Configure>

    To connect, set the following connection properties: Set URL to the machine name or IP address of the server and the port the server is running on, for example, https://server:port. The User and Password are required to authenticate to the HPCC Systems cluster specified in the URL. Note that LDAP authentication is not currently supported by our ODBC driver.

    Set Version to the WsSQL Web server version. Note that if you have not already done so, you will need to install the WsSQL service on the HPCC Systems server. The WsSQL Web service is used to interact with the underlying HPCC Systems platform.

    Set Cluster to the target cluster.

  4. Configure the resource in the Web.xml:

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

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.