Start of extensions docs.

doc/extensions.rst

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+=======================================
+ psycopg 2 extensions to the DBAPI 2.0
+=======================================
+
+This document is a short summary of the extensions built in psycopg 2.0.x over
+the standard `Python Database API Specification 2.0`__, usually called simply
+DBAPI-2.0 or even PEP-249.  Before reading on this document please make sure
+you already know how to program in Python using a DBAPI-2.0 compliant driver:
+basic concepts like opening a connection, executing queries and commiting or
+rolling back a transaction will not be explained but just used.
+
+__ http://www.python.org/peps/pep-0249.html
+
+
+Connection and cursor factories
+===============================
+
+psycopg 2 exposes two new-style classes that can be sub-classed and expanded to
+adapt them to the needs of the programmer: `cursor` and `connection`.  The
+`connection` class is usually sub-classed only to provide a . `cursor` is much
+more interesting, because it is the class where query building, execution and
+result type-casting into Python variables happens.
+
+Row factories
+-------------
+
+tzinfo factories
+----------------
+
+
+Setting transaction isolation levels
+====================================
+
+
+Adaptation of Python values to SQL types
+========================================
+
+
+Type casting of SQL types into Python values
+============================================
+
+Extra type objects
+------------------
+
+
+Working with times and dates
+============================
+
+
+Receiving NOTIFYs
+=================
+
+
+Using COPY TO and COPY FROM
+===========================
+
+
+PostgreSQL status message and executed query
+============================================
+
+`cursor` objects have two special fields related to the last executed query:
+
+  - `.query` is the textual representation (str or unicode, depending on what
+    was passed to `.execute()` as first argument) of the query *after* argument
+    binding and mogrification has been applied. To put it another way, `.query`
+    is the *exact* query that was sent to the PostgreSQL backend.
+    
+  - `.statusmessage` is the status message that the backend sent upon query
+    execution. It usually contains the basic type of the query (SELECT,
+    INSERT, UPDATE, ...) and some additional information like the number of
+    rows updated and so on. Refer to the PostgreSQL manual for more
+    information.
+