"Default" refers to a "default domain" within a single configuration
instance. You will be working with 2 configuration instances, so both
will have a "default domain". This also means that your old code can
stay unchanged, while the new application won't be able to use a
static method for DataContext creation (either with domain name or
without it). Instead you will need to write your own factory method
that gets a hold of "conf", gets its default domain, and creates a
context from it.
Andrus
On May 3, 2010, at 2:26 PM, Borut Bolčina wrote:
> Hello,
>
> Our old large web application uses one database and there are a
> large number
> of DataContext.createDataContext(); statements all over the web
> application
> itself and jars it depends on.
>
> Now there is a need to access another database. Currently the
> Configuration
> gets initialized with the first call of createDataContext - there is
> no
> special class which initializes cayenne eagerly. All defaults.
>
> Reading the API (
> http://cayenne.apache.org/doc30/api/org/apache/cayenne/access/DataContext.html#createDataContext%28%29)
> there is a sentence:
>
> "Factory method that creates and returns a new instance of
> DataContext based
> on default domain."
>
> What is the default domain? I can't find anything in the modeler or
> in the
> cayenne xml configuration file to mark one node as default.
>
> Currently the cayenne.xml comes from one of the external jars, not
> the web
> application itself. Now I will have to create a manually crafted
> my-cayenne.xml configuration file which has another data node and
> initialize
> it with something like:
>
> DefaultConfiguration conf = new DefaultConfiguration("my-
> cayenne.xml");
>
> But I suspect I would have to find all occurances of
> createDataContext() and
> replace it with createDataContext("old-node-name"). I would really
> like to
> avoid that!
>
> Instead, can I just leave the access code to "old" database as is
> and only
> create data context for the new database with
> createDataContext("my-new-node-name")?
>
> -Borut
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