Hi Andrus,
when it comes to the generic persistence data objects, how I have to
define it?
DataMap map = new DataMap(mapName);
DbEntity entity = new DbEntity("projects");
DbAttribute attr = new DbAttribute("ora_uname");
attr.setMaxLength(20);
attr.setMandatory(true);
entity.addAttribute(attr);
map.addDbEntity(entity);
ObjEntity objEntity = new ObjEntity("Projects");
objEntity.setDbEntity(entity);
objEntity.setClassName(// ??);
Should I set the name explicitly to
"org.apache.cayenne.CayenneDataObject" (or subclasses)?
Thanks
André
Andrus Adamchik <[email protected]> wrote:
Hi André,
Yes, if you wish you can create the entire Cayenne stack via API,
loading parts of it from XML files, etc.
* To load DataMap from XML, use MapLoader:
http://cayenne.apache.org/doc30/api/org/apache/cayenne/map/MapLoader.html
* To create a DataContext, use DataDomain.createDataContext().
* To change loaded DataMap, use DataMap methods to access and
manipulate the entities:
http://cayenne.apache.org/doc30/api/org/apache/cayenne/map/DataMap.html
Andrus
On Jan 21, 2011, at 11:26 AM, André Rothe wrote:
Hello,
I try to write a short test program, which can use multiple data
sources dynamically with Cayenne. At the moment I have finished the
replacement for the driver.xml and cayenne.xml (I think):
--------------------------------
// init a connection
DataSourceInfo properties = new DataSourceInfo();
properties.setDataSourceUrl("jdbc:oracle:thin:@test:1521:play");
properties.setJdbcDriver("oracle.jdbc.OracleDriver");
properties.setMinConnections(1);
properties.setMaxConnections(1);
properties.setUserName("scott");
properties.setPassword("testme");
PoolManager pmA = new PoolManager(
properties.getJdbcDriver(),
properties.getDataSourceUrl(),
properties.getMinConnections(),
properties.getMaxConnections(),
properties.getUserName(),
properties.getPassword());
DataMap map = new DataMap("test_db");
//??
DataNode node = new DataNode("dev_db");
node.addDataMap(map);
node.setDataSource(pmA);
DataDomain domainA = new DataDomain();
domainA.addNode(node);
domainA.addMap(map);
// get the context ??
// init another connection
properties.setDataSourceUrl("jdbc:oracle:thin:@test:1521:test");
PoolManager pmB = new PoolManager(
properties.getJdbcDriver(),
properties.getDataSourceUrl(),
properties.getMinConnections(),
properties.getMaxConnections(),
properties.getUserName(),
properties.getPassword());
map = new DataMap("test_db");
//??
node = new DataNode("test_db");
node.addDataMap(map);
node.setDataSource(pmB);
DataDomain domainB = new DataDomain();
domainB.addNode(node);
domainB.addMap(map);
// get the context ??
---------------------
The questions:
How I can load a predefined data map from a map.xml into my DataMap
object without affecting the already defined objects (node, domain
etc.)? Can I define the map dynamically? How I can create a
DataContext for the domains I have?
I have a lot of different data sources, which are defined by some
other parts of the application. The DataSourceInfo object must be
changeable by the user and it can be, that I get changes on the
database structure, so it must be possible to react on them with a
new data-map at runtime.
Is it possible with Cayenne?
Tanks
André
