RE: Programmatically switching between DataNodes

From: Howard Treisman (htreisma..voka.com)
Date: Mon Dec 19 2005 - 04:37:44 EST

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    Hi

    Thanks for the info, Andrus.

    To be quite honest, I didn't quite understand the V1.2 features, so I
    might wait around for some better docs/examples on that.

    However, I did manage to programmatically modify the DataNode used for a
    particular Map.
    I created both DataNodes in the same project.
    For the record, this is the code that I used:

            // targetDatabase is a parameter to this function
            Configuration conf = Configuration.getSharedConfiguration();
            DataDomain domain = conf.getDomain();
            DataMap map = domain.getMap("TheDomainMap");
            Collection dataNodes = domain.getDataNodes();
            for (Iterator iter = dataNodes.iterator(); iter.hasNext();) {
                DataNode dataNode = (DataNode) iter.next();
                if (dataNode.getName().equalsIgnoreCase(targetDatabase)) {
                    System.out.println("Adding Node:" + dataNode.getName() +
    " to Map:" + map.getName());
                    dataNode.addDataMap(map);
                } else {
                    System.out.println("Removing Node:" + dataNode.getName()
    + " from Map:" + map.getName());
                    dataNode.removeDataMap(map.getName());
                }
            }

    Many thanks,
    Howard

    -----Original Message-----
    From: Andrus Adamchik [mailto:andru..bjectstyle.org]
    Sent: Sunday, 18 December 2005 3:33 AM
    To: cayenne-use..bjectstyle.org
    Subject: Re: Programmatically switching between DataNodes

    In Cayenne 1.1 your options are (1) programatic switch of DataNode or
    (2) using cdeploy Ant task to re-assemble you app for deployment:

    http://objectstyle.org/cayenne/userguide/deploy/cdeploy.html

    Cayenne 1.2 supports auto-detection of the DB type (so you don't have to
    switch adapter when going from MySQL to Oracle), and also reading JNDI
    info from preferences:

    http://objectstyle.org/confluence/display/CAY/1.2+User+Guide

    So if you can use real JNDI in deployment, you won't have to change
    anything at all.

    Andrus

    On Dec 17, 2005, at 8:19 AM, Howard Treisman wrote:
    > Hi
    >
    > I'm running a project where I develop locally against MySQL, and
    > deploy on my client's site against Oracle. I'd like to have a single
    > Domain (I hope I'm using the correct terminology here), with two
    > different DataNodes, one for development, and one for production.
    >
    > I presume there is some reasonably straight-forward way of telling
    > Cayenne which of the two DataNodes to use. I've really had a very good

    > look in both the Javadocs and User Guide, but can't find this
    > information.
    >
    > Could anyone help me?
    >
    > Many thanks,
    > Howard
    >
    >
    >

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