RE: Re: AW: [Objectbridge-jdo-dev] jdo extension

[<tr...@th...>]

How does this sound for starters anyways:

JDO Extensions

Set the referenced table using table-name as an extension of the class.

<class name="Product" identity-type="application">
<extension vendor-name="ojb" table-name="Product"/>

Set the referenced column in the above table using column-name and optionally a jdbc-type. jdbc-type matches the ojb type mapping.

<field name="stock">
<extension vendor-name="ojb" column-name="stock" jdbc-type="INTEGER"/>
</field>

If no extensions are specified then the following default mappings will occur:

table-name=Class.getName()

column-name=field name

jdbc-type=equivalent java type



Travis

---- Original Message ----
From: Christian Sell <nc-...@ne...>
Sent: 2002-05-24
To: obj...@so...
Subject: Re: AW: [Objectbridge-jdo-dev] jdo extension



---- Original message ----
>Having enough defaults so that a pure stnadard .jdo file 
will handle the
>most obvious cases is a huge step forward in usability, ease 
of use, and
>reducing learning curve.
>
>I think htis should be a major objective actually. Not only 
does it make it
>easier to work with, but I have found that easeo of use 
ascpects like this
>tend to force cleaner architectures as well.
>

I disagree. A database is a resource that must not be taken 
lightly, as it has the strongest performance implications if 
treated wrongly. Luring people into the illusion that they 
can do away with it by the push of a button has the potential 
of generating disappointments. 
IMO, a good O/R framework must either exploit or allow easy 
access to the full capabilities of the underlying DBMS. And 
in a corporate production scenario, you will almost always 
have to map your objects to a pre-existing schema.

I see a value in generating default mappings as a starting 
point for projects that have the privilege of starting from 
scratch, however.

regards,
Christian

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