[hibernate-dev] Patch for HHH-272: Custom SQL for column gets and sets
rob at hasselbaum.net
Mon Sep 7 19:15:27 EDT 2009
On 09/07/2009 06:37 PM, Max Rydahl Andersen wrote:
> What is this doing that a parameterized custom type can't do ? Is this
> "just" to get a cleaner hbm.xml syntax or ?
It addresses two issues that a custom type cannot address. First, it
enables calling database functions that don't have an equivalent (or
efficient) Java implementation. And second, since the conversion logic
happens inside the database, relational operations can be applied to the
decoded value such as sorting and non-equality searching.
For example, my primary use case is encryption. We have implemented an
encryption package inside Oracle and we don't wish to replicate that
logic in Java. But more importantly, there are certain fields that the
business has told us we must encrypt (for example, the user's last
name), but we still need to be able to sort on the plain text values and
do partial-match searches using the LIKE operator. This can't be
achieved with a custom type; the conversion must happen inside the database.
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