I would say "from a Python function"  which could receive some context.

Here's why: The keys are stored in an external keystore, which is keyed off 
of a value in the row. Notionally, the table would look
like this:

create table secure (external_keystore_key varchar(255), secure_value 
varchar(255));

When secure_value is gotten, or set, I would use external_keystore_key to 
talk to the external keystore, get the key, and decrypt or encrypt
the value.

Thanks.

On Sunday, December 13, 2015 at 8:47:14 PM UTC-5, Michael Bayer wrote:
>
>
>
> On 12/13/2015 08:29 PM, Michael Wilson wrote: 
> > Hi, 
> > 
> > I read with great interest these examples: 
> > 
> > 
> https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/SymmetricEncryption 
> > 
> > Which use hybrid_property or TypeDecorators to implement encryption. 
> > 
> > My question is, now would you use these with a /varying/ key - one that 
> > possibly changed per row (or primary key). 
>
> well if you queried ten rows, where would you want to get those ten keys 
> from ?   During the query, from the DB, a Python function, or after the 
> fact ? 
>
>
>
> > 
> > Thanks for any ideas! 
> > 
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