Duplicate coloumn name

Hi,
I have two classes (B, C) derived from the same base (A). Both of them have
a field called field1. I cannot put this field to the base class because
this would not make sence.
When I run the schema tool to initialize the database a duplicate coloumn
name FIELD1X exception is thrown.
The option to create a D class that is derived from A and make it as the
base class for B and C is very hard to do for me, bacause I have to reserve
the compatibility with my ODMG 3.0 database.
Do you have a resolution for this problem. I think it is related to the
single table inheritance. And I also know that multiple table inheritance is
no supported.
Is it possible that if my base class doesn't contain importatnt fields only
methods that I do not specify it as persistent-capable?
Thanks in advance, best regards
Gabor Kover
Scriptum Inc.

Hello --
We do in fact have a workaround for the duplicate column problem. As
described in the kodo user guide chapter on customizing the database mapping
for classes, it is possible to tell Kodo to use a different name for a
field's database column. This is done through the metadata, like so:
<field name="repeatedField">
<extension vendor-name="tt" key="data-column" value="FOO"/>
</field>
So you can simply map the repeated field from one of the subclasses to a
different name.
Let us know if you have any further questions on this.
-- Abe White
Kodo Product Team
"Gabor Kover" <[email protected]> wrote in message
news:9mnjd8$5i2$[email protected]..
Hi,
I have two classes (B, C) derived from the same base (A). Both of themhave
a field called field1. I cannot put this field to the base class because
this would not make sence.
When I run the schema tool to initialize the database a duplicate coloumn
name FIELD1X exception is thrown.
The option to create a D class that is derived from A and make it as the
base class for B and C is very hard to do for me, bacause I have toreserve
the compatibility with my ODMG 3.0 database.
Do you have a resolution for this problem. I think it is related to the
single table inheritance. And I also know that multiple table inheritanceis
no supported.
Is it possible that if my base class doesn't contain importatnt fieldsonly
methods that I do not specify it as persistent-capable?
Thanks in advance, best regards
Gabor Kover
Scriptum Inc.

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Last Modified: Feb 4, 2015
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