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Index and targets for subclassing work again.

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This commit is contained in:
Daniele Varrazzo 2010-02-14 04:59:40 +00:00
parent 323340abc6
commit edc690e60a
1 changed files with 12 additions and 8 deletions
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doc/advanced.rst
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@ -3,13 +3,6 @@ More advanced topics
.. sectionauthor:: Daniele Varrazzo <daniele.varrazzo@gmail.com> .. sectionauthor:: Daniele Varrazzo <daniele.varrazzo@gmail.com>
.. index::
double: Subclassing; Cursor
double: Subclassing; Connection
.. _subclassing-connection:
.. _subclassing-cursor:
.. testsetup:: * .. testsetup:: *
import re import re
@ -17,6 +10,13 @@ More advanced topics
cur.execute("CREATE TABLE atable (apoint point)") cur.execute("CREATE TABLE atable (apoint point)")
conn.commit() conn.commit()
.. index::
double: Subclassing; Cursor
double: Subclassing; Connection
.. _subclassing-connection:
.. _subclassing-cursor:
Connection and cursor factories Connection and cursor factories
------------------------------- -------------------------------
@ -145,7 +145,9 @@ user-defined), its OID must be known. It can be retrieved either by the second
column of the :attr:`cursor.description`: column of the :attr:`cursor.description`:
>>> cur.execute("SELECT NULL::point") >>> cur.execute("SELECT NULL::point")
>>> point_oid = cur.description[0][1] # usually returns 600 >>> point_oid = cur.description[0][1]
>>> point_oid
600
or by querying the system catalogs for the type name and namespace (the or by querying the system catalogs for the type name and namespace (the
namespace for system objects is :sql:`pg_catalog`): namespace for system objects is :sql:`pg_catalog`):
@ -158,6 +160,8 @@ namespace for system objects is :sql:`pg_catalog`):
... AND nspname = %(namespace)s""", ... AND nspname = %(namespace)s""",
... {'typename': 'point', 'namespace': 'pg_catalog'}) ... {'typename': 'point', 'namespace': 'pg_catalog'})
>>> point_oid = cur.fetchone()[0] >>> point_oid = cur.fetchone()[0]
>>> point_oid
600
After you know the object OID, you must can and register the new type: After you know the object OID, you must can and register the new type: