--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/db/backends/postgresql_psycopg2/base.py Wed Jun 02 18:57:35 2010 +0200
@@ -0,0 +1,191 @@
+"""
+PostgreSQL database backend for Django.
+
+Requires psycopg 2: http://initd.org/projects/psycopg2
+"""
+
+import sys
+
+from django.db import utils
+from django.db.backends import *
+from django.db.backends.signals import connection_created
+from django.db.backends.postgresql.operations import DatabaseOperations as PostgresqlDatabaseOperations
+from django.db.backends.postgresql.client import DatabaseClient
+from django.db.backends.postgresql.creation import DatabaseCreation
+from django.db.backends.postgresql.version import get_version
+from django.db.backends.postgresql_psycopg2.introspection import DatabaseIntrospection
+from django.utils.safestring import SafeUnicode, SafeString
+
+try:
+ import psycopg2 as Database
+ import psycopg2.extensions
+except ImportError, e:
+ from django.core.exceptions import ImproperlyConfigured
+ raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e)
+
+DatabaseError = Database.DatabaseError
+IntegrityError = Database.IntegrityError
+
+psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
+psycopg2.extensions.register_adapter(SafeString, psycopg2.extensions.QuotedString)
+psycopg2.extensions.register_adapter(SafeUnicode, psycopg2.extensions.QuotedString)
+
+class CursorWrapper(object):
+ """
+ A thin wrapper around psycopg2's normal cursor class so that we can catch
+ particular exception instances and reraise them with the right types.
+ """
+
+ def __init__(self, cursor):
+ self.cursor = cursor
+
+ def execute(self, query, args=None):
+ try:
+ return self.cursor.execute(query, args)
+ except Database.IntegrityError, e:
+ raise utils.IntegrityError, utils.IntegrityError(*tuple(e)), sys.exc_info()[2]
+ except Database.DatabaseError, e:
+ raise utils.DatabaseError, utils.DatabaseError(*tuple(e)), sys.exc_info()[2]
+
+ def executemany(self, query, args):
+ try:
+ return self.cursor.executemany(query, args)
+ except Database.IntegrityError, e:
+ raise utils.IntegrityError, utils.IntegrityError(*tuple(e)), sys.exc_info()[2]
+ except Database.DatabaseError, e:
+ raise utils.DatabaseError, utils.DatabaseError(*tuple(e)), sys.exc_info()[2]
+
+ def __getattr__(self, attr):
+ if attr in self.__dict__:
+ return self.__dict__[attr]
+ else:
+ return getattr(self.cursor, attr)
+
+ def __iter__(self):
+ return iter(self.cursor)
+
+class DatabaseFeatures(BaseDatabaseFeatures):
+ needs_datetime_string_cast = False
+ can_return_id_from_insert = False
+
+class DatabaseOperations(PostgresqlDatabaseOperations):
+ def last_executed_query(self, cursor, sql, params):
+ # With psycopg2, cursor objects have a "query" attribute that is the
+ # exact query sent to the database. See docs here:
+ # http://www.initd.org/tracker/psycopg/wiki/psycopg2_documentation#postgresql-status-message-and-executed-query
+ return cursor.query
+
+ def return_insert_id(self):
+ return "RETURNING %s", ()
+
+class DatabaseWrapper(BaseDatabaseWrapper):
+ operators = {
+ 'exact': '= %s',
+ 'iexact': '= UPPER(%s)',
+ 'contains': 'LIKE %s',
+ 'icontains': 'LIKE UPPER(%s)',
+ 'regex': '~ %s',
+ 'iregex': '~* %s',
+ 'gt': '> %s',
+ 'gte': '>= %s',
+ 'lt': '< %s',
+ 'lte': '<= %s',
+ 'startswith': 'LIKE %s',
+ 'endswith': 'LIKE %s',
+ 'istartswith': 'LIKE UPPER(%s)',
+ 'iendswith': 'LIKE UPPER(%s)',
+ }
+
+ def __init__(self, *args, **kwargs):
+ super(DatabaseWrapper, self).__init__(*args, **kwargs)
+
+ self.features = DatabaseFeatures()
+ autocommit = self.settings_dict["OPTIONS"].get('autocommit', False)
+ self.features.uses_autocommit = autocommit
+ self._set_isolation_level(int(not autocommit))
+ self.ops = DatabaseOperations(self)
+ self.client = DatabaseClient(self)
+ self.creation = DatabaseCreation(self)
+ self.introspection = DatabaseIntrospection(self)
+ self.validation = BaseDatabaseValidation(self)
+
+ def _cursor(self):
+ new_connection = False
+ set_tz = False
+ settings_dict = self.settings_dict
+ if self.connection is None:
+ new_connection = True
+ set_tz = settings_dict.get('TIME_ZONE')
+ if settings_dict['NAME'] == '':
+ from django.core.exceptions import ImproperlyConfigured
+ raise ImproperlyConfigured("You need to specify NAME in your Django settings file.")
+ conn_params = {
+ 'database': settings_dict['NAME'],
+ }
+ conn_params.update(settings_dict['OPTIONS'])
+ if 'autocommit' in conn_params:
+ del conn_params['autocommit']
+ if settings_dict['USER']:
+ conn_params['user'] = settings_dict['USER']
+ if settings_dict['PASSWORD']:
+ conn_params['password'] = settings_dict['PASSWORD']
+ if settings_dict['HOST']:
+ conn_params['host'] = settings_dict['HOST']
+ if settings_dict['PORT']:
+ conn_params['port'] = settings_dict['PORT']
+ self.connection = Database.connect(**conn_params)
+ self.connection.set_client_encoding('UTF8')
+ self.connection.set_isolation_level(self.isolation_level)
+ connection_created.send(sender=self.__class__)
+ cursor = self.connection.cursor()
+ cursor.tzinfo_factory = None
+ if new_connection:
+ if set_tz:
+ cursor.execute("SET TIME ZONE %s", [settings_dict['TIME_ZONE']])
+ if not hasattr(self, '_version'):
+ self.__class__._version = get_version(cursor)
+ if self._version[0:2] < (8, 0):
+ # No savepoint support for earlier version of PostgreSQL.
+ self.features.uses_savepoints = False
+ if self.features.uses_autocommit:
+ if self._version[0:2] < (8, 2):
+ # FIXME: Needs extra code to do reliable model insert
+ # handling, so we forbid it for now.
+ from django.core.exceptions import ImproperlyConfigured
+ raise ImproperlyConfigured("You cannot use autocommit=True with PostgreSQL prior to 8.2 at the moment.")
+ else:
+ # FIXME: Eventually we're enable this by default for
+ # versions that support it, but, right now, that's hard to
+ # do without breaking other things (#10509).
+ self.features.can_return_id_from_insert = True
+ return CursorWrapper(cursor)
+
+ def _enter_transaction_management(self, managed):
+ """
+ Switch the isolation level when needing transaction support, so that
+ the same transaction is visible across all the queries.
+ """
+ if self.features.uses_autocommit and managed and not self.isolation_level:
+ self._set_isolation_level(1)
+
+ def _leave_transaction_management(self, managed):
+ """
+ If the normal operating mode is "autocommit", switch back to that when
+ leaving transaction management.
+ """
+ if self.features.uses_autocommit and not managed and self.isolation_level:
+ self._set_isolation_level(0)
+
+ def _set_isolation_level(self, level):
+ """
+ Do all the related feature configurations for changing isolation
+ levels. This doesn't touch the uses_autocommit feature, since that
+ controls the movement *between* isolation levels.
+ """
+ assert level in (0, 1)
+ try:
+ if self.connection is not None:
+ self.connection.set_isolation_level(level)
+ finally:
+ self.isolation_level = level
+ self.features.uses_savepoints = bool(level)