[DB-SIG] Improved support for prepared SQL statements

Tony Locke tlocke at tlocke.org.uk
Wed Dec 17 20:37:57 CET 2014

On the question of extending the DB-API to accommodate prepared
statements, from my narrow point of view as a maintainer of pg8000
it's unnecessary, as pg8000 uses prepared statements for everything
anyway. In later versions of Postgres, the query plan is potentially
updated every time a prepared statement is executed, as opposed to the
old days when the query plan for a prepared statement was fixed.

So (again from my limited point of view) it seems there isn't any
reason ever to use anything other than a prepared statement.



On 17 December 2014 at 17:54, Michael Bayer <mike_mp at zzzcomputing.com> wrote:
>> On Dec 17, 2014, at 10:41 AM, M.-A. Lemburg <mal at egenix.com> wrote:
>> Another possibility is to write a layer on top of the DB-API
>> to abstract the underlying queries away from the application
>> and only have the layer provide dedicated methods for the
>> things the application needs, such as query method for specific
>> details or inserting application objects into the database.
>> This is the approach we usually take in our projects, since
>> it provides better separation of the application logic from the
>> database logic than using ORMs usually provides. It's also possible
>> to use such an abstraction layer on top of an ORM, if you want
>> to the ORM to deal with abstracting away database backend details.
> When I read this quickly, it seems to make sense, but when I really try to imagine what this means, I come out at the same place every time: if you’ve written a “method for inserting application objects into the database”, you’ve written an ORM.   Databases don’t store “application objects”, they store rows.  So there has to be “ORM” in there.
>>> I am looking for higher service levels without following the software
>>> design directions from object-relational managers like SQLAlchemy
>>> and SQLObject.
> replying to Markus -
> SQLAlchemy’s ORM is only an optional component of the SQLAlchemy database toolkit overall.  If you would like a very mature and well proven SQL abstraction layer that does not provide any design directions whatsoever (not to mention much better performance than the ORM), please consider SQLAlchemy Core: http://docs.sqlalchemy.org/en/rel_0_9/core/index.html.
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