The situation you describe is addressed by multiple DataDomains (data
domain is the first thing you create in the Modeler when starting a
project). One catch is that you can't share the DataMap between
domains using the Modeler. So you may have to do some runtime
configuration. E.g. you can have the following structure setup in the
Modeler:
DD1
DM1
DN1
DD2
DN2
Then you can do this on startup to share the DataMap (I think Michael
also posted a similar example some time back)
// find the DataMap
Configuration c = Configuration.getSharedConfiguration();
DataDomain d1 = c.getDomain("DD1");
DataMap m1 = d1.getMap("DM1");
// link it to a second domain
DataDomain d2 = c.getDomain("DD2");
DataNode n2 = d2.getNode("DN2");
n2.addDataMap(m1);
d2.reindexNodes();
Another catch with multiple DataDomains is that you have to pass an
appropriate domain name when creating a DataContext for a given user.
So instead of
DataContext dc = DataContext.createDataContext();
you'd have to do something like this:
String domainName = ... // determine based on user group
DataContext dc = DataContext.createDataContext(domainName);
Andrus
On Jun 7, 2006, at 4:22 AM, james wrote:
Gentry, Michael (Contractor <michael_gentry <at> fanniemae.com>
writes:
You need to have multiple DataNodes in your model -- one for each
database. You also need multiple DataMaps. Each DataMap should
contain
the schema for one of the databases. Then in the modeler, under the
DataMap Configuration section, select the DataNode to associate
the map
to. Cayenne will then use the right database connection for the
objects
you are working upon.
Hi,
I have different groups of web users. A new database is created
for each
group. Hence I need one DataMap and multiple DataNodes. Can one
DataMap be
assigned to two or more DataNodes?
Regards,
James
