On Jul 9, 2008, at 4:32 PM, JR Ruggentaler wrote:
On Jul 9, 2008, at 3:11 PM, David Avendasora wrote:
JR,
I think you don't understand what the prototypes are that Chuck is
referring to.
I do understand but we are not using prototypes. The EO models are
quite old and were always targeted at Oracle and the external types
were specified using Oracle types (VARCHAR2, NUMBER,...) back in the
WO 4.x days.
The good news is that setting them up is only marginally more work
than manually updating everything once. So if you are at a point of
considering manually updating the model, then you might as well move
to Prototypes, and then not have to worry about it again in the future.
Prototypes, when talking about Entity Modeler, are a way to
abstract the DB's data types from the model. So instead of
specifying the external type for a attribute, you specify which
prototype to use. You can then swap out the prototypes from Oracle
ones to Derby ones and your done. Without prototypes, you'll have
to manually change them. Prototypes _are_ the automatic way of
changing RDBMSs that you are looking for.
http://wiki.objectstyle.org/confluence/display/WOL/Using+Entity+Modeler
I will check out the page.
Scroll down to the section on prototypes and it will show you how
to add them to your model. This should save you a lot of time in
the future.
Dave
On Jul 9, 2008, at 3:32 PM, JR Ruggentaler wrote:
No, no prototypes are used. All the entities are EOGenericRecords
and are modified quarterly+. We are trying speed access to this
data but we don't want to cache these entities due to the amount
of data.
On Jul 9, 2008, at 2:24 PM, Chuck Hill wrote:
Are you using prototypes in your model?
On Jul 9, 2008, at 12:17 PM, JR Ruggentaler wrote:
I have a EO model that I want to move some entities at runtime
from an Oracle database to a local Derby database. I created a
new model at run time and added the entities to the new model
and removed the same entities from the other model. Then I tried
using:
EOSchemaGeneration
.createTableStatementsForEntityGroup(localModel.entities());
to generate the Derby create statements but that fails at:
EOSQLExpression.columnTypeStringForAttribute();
the external types from the Oracle model are different from
Derby. For example Derby doesn't recognize NUMBER and VARCHAR2.
Is there some way to convert a model written for one RDBMS
(Oracle) to another RDBMS (Derby)? I can manually iterate the
attributes and change the attribute external type
(EOAttribute.setExternalType()) but I am hoping EOF or some one
on this list has a more elegant way of switching RDBMS on the
fly in code.
P.S. I am using WO 5.4
JR
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