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"""
PostgreSQL database backend for Django.
Requires psycopg 2: http://initd.org/projects/psycopg2
"""
from django.db.backends import *
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 DatabaseFeatures(BaseDatabaseFeatures):
needs_datetime_string_cast = False
uses_savepoints = True
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
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()
self.ops = DatabaseOperations()
self.client = DatabaseClient()
self.creation = DatabaseCreation(self)
self.introspection = DatabaseIntrospection(self)
self.validation = BaseDatabaseValidation()
def _cursor(self, settings):
set_tz = False
if self.connection is None:
set_tz = True
if settings.DATABASE_NAME == '':
from django.core.exceptions import ImproperlyConfigured
raise ImproperlyConfigured("You need to specify DATABASE_NAME in your Django settings file.")
conn_string = "dbname=%s" % settings.DATABASE_NAME
if settings.DATABASE_USER:
conn_string = "user=%s %s" % (settings.DATABASE_USER, conn_string)
if settings.DATABASE_PASSWORD:
conn_string += " password='%s'" % settings.DATABASE_PASSWORD
if settings.DATABASE_HOST:
conn_string += " host=%s" % settings.DATABASE_HOST
if settings.DATABASE_PORT:
conn_string += " port=%s" % settings.DATABASE_PORT
self.connection = Database.connect(conn_string, **self.options)
self.connection.set_isolation_level(1) # make transactions transparent to all cursors
self.connection.set_client_encoding('UTF8')
cursor = self.connection.cursor()
cursor.tzinfo_factory = None
if set_tz:
cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
if not hasattr(self, '_version'):
version = get_version(cursor)
self.__class__._version = version
if version < (8, 0):
# No savepoint support for earlier version of PostgreSQL.
self.features.uses_savepoints = False
return cursor
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