Author: Written by D'Arcy J.M. Cain (<firstname.lastname@example.org>). Based heavily on code written by Pascal Andre <email@example.com>. Copyright © 1995, Pascal Andre. Further modifications Copyright © 1997-2000 by D'Arcy J.M. Cain.
You may either choose to use the old mature interface provided by the pg module or otherwise the newer pgdb interface compliant with the DB-API 2.0 specification developed by the Python DB-SIG.
Here we describe only the older pg API. As long as PyGreSQL does not contain a description of the DB-API you should read about the API at http://www.python.org/topics/database/DatabaseAPI-2.0.html.
A tutorial-like introduction to the DB-API can be found at http://www2.linuxjournal.com/lj-issues/issue49/2605.html
The pg module defines three objects:
pgobject, which handles the connection and all the requests to the database,
pglargeobject, which handles all the accesses to Postgres large objects, and
pgqueryobject that handles query results.
If you want to see a simple example of the use of some of these functions, see http://www.druid.net/rides where I have a link at the bottom to the actual Python code for the page.
Some constants are defined in the pg module dictionary. They are intended to be used as a parameters for methods calls. You should refer to the libpq description (Chapter 1) for more information about them. These constants are:
large objects access modes, used by (pgobject.)locreate and (pglarge.)open.
positional flags, used by (pglarge.)seek.
constants that give the current version