Jody Garnett ha scritto:
> I would also consider extending the format of updateSchema so we can supply 
> default expressions to the "new" columns.

I can propose another possibility as well. In JDBC data stores
we use to put quite a bit of extra information as user data
in each attribute: the native srid, or the native column type,
and so on.

We could do the same for updateSchema, establish a set of
conventions that udpateSchema is supposed to follow to
force a specific database native type or a specific default value.
For example, what does it mean the attribute is a String?
CHAR, VARCHAR, CLOB? What does it mean the attribute is a Double?
Is it a DOUBLE, or a NUMBER(12,5)?

Generally speaking there is quite a bit of native information that
we don't capture in AttributeDescriptor. But we could put it in the
associated user map.

Cheers
Andrea


-- 
Andrea Aime
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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