Re: [Springframework-developer] Exposing LOB support to Jdbc Object layer

[<jue...@we...>]

Isn't field-specific lazy loading a required feature of JDO? What does =
Kodo JDO offer in that respect, for example? Can you lazily load LOB =
fields in a database-independent manner with Kodo?
=20
Juergen
=20

________________________________

Von: spr...@li... im Auftrag =
von Colin Sampaleanu
Gesendet: Mo 03.05.2004 20:18
An: spr...@li...
Betreff: Re: [Springframework-developer] Exposing LOB support to Jdbc =
Object layer



j=FCrgen h=F6ller [werk3AT] wrote:

>That looks interesting! I didn't think about overloaded SqlParameter =
constructors before; that definitely makes sense. How to you handle the =
LobCreator lifecycle there? LobCreator.close needs to be invoked after =
PreparedStatement execution (but before transaction completion).
>
>BTW, I've recently refined the LOB support for jdbc.core: There are =
AbstractLobCreatingPreparedStatementCallback and =
AbstractLobStreamingResultSetExtractor classes now (don't we love our =
class naming patterns!), to make LOB handling via JdbcTemplate more =
convenient. Have a look at imagedb's DefaultImageDatabase class for =
usage examples.
>
>There's also a ClobStringType class in our Hibernate support, for =
storing String properties in CLOB fields. That allows to transparently =
store long Strings in Oracle CLOBs respectively MySQL text fields, for =
example. It registers a TransactionSynchronization for the =
LobCreator.close call, so just works within a Spring transaction.
>=20
>
I've been trying to convince Gavin for ages to make it possible to lazy
load columns (not just collections), which would make stuff like
ClobStringType a lot more useful. Right now if you have a table with a
LOB column and use something like ClobStringType you pay the price and
load it even if you don't need it.

Oh well...




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