[DB-SIG] Preparing statement API

[Eric Brunson]

--ZfOjI3PrQbgiZnxM
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: quoted-printable

* M.-A. Lemburg (mal@lemburg.com) [000126 10:06]:
> Hrvoje Niksic wrote:
> >=20
> > "M.-A. Lemburg" <mal@lemburg.com> writes:
> >=20
> > > >     statement =3D cur.prepare("INSERT INTO foo (user, name) VALUES =
(?, ?)")
> > [...]
> > > The problem with this approach is that you'd have to store the
> > > perpared information somewhere.  This is usually done by the cursor
> > > which is not under Python's control.
> >=20
> > You'd store it (or a pointer to it) in the statement object, returned
> > by cursor.prepare().  Given that prepare() is a cursor method, the
> > cursor can be made aware of each such object.
> >=20
> > > cursor.prepare(operation)
> > >          Prepare a database operation (query or command) statement for
> > >          later execution and set cursor.command. To execute a prepared
> > >        statement, pass cursor.statement to one of the .executeXXX()
> > >        methods.
> > >
> > > cursor.command
> > >          Provides access to the current prepared SQL command available
> > >          through the cursor. This is set by .prepare(), all catalog
> > >        methods, .execute() and .executemany().
> >=20
> > This is very close to what I proposed, except that my cursor.prepare()
> > returns the statement (which you provide through cursor.command).
> > This allows one to prepare more than one statement using one cursor.
>=20
> Maybe this is just an ODBC thing, but you cannot prepare more
> than one statement on a cursor (in ODBC the notion of cursors
> is captured by the HSTMT or statement handle). For ODBC, your
> .prepare() function would have to return a new cursor.
>=20

That seems to be true of the DCOracle implementation, also.  Yesterday
I tried to reuse a cursor object and it failed, I had to declare a new
one.  This may be why they put the prepare() method in the connection
object.


--=20
Eric Brunson                * _ o  *       Faster and faster,            =
=20
brunson@brunson.com        * / //\           until the thrill of speed   =
=20
brunson@level3.net            \>>|   *         overcomes the fear of death
page-eric@level3.net           \\,     =20

--ZfOjI3PrQbgiZnxM
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.0 (SunOS)
Comment: For info see http://www.gnupg.org

iD8DBQE4jy1nQDyMrcmL1RcRAU7RAJ4pb4d2zwXVDB8AhJnyk5FGGtR1mQCfQAMt
4QkbTDgy5sm561KBdIb48w0=
=PqLB
-----END PGP SIGNATURE-----

--ZfOjI3PrQbgiZnxM--