100 lines
4.0 KiB
Python
100 lines
4.0 KiB
Python
"""
|
|
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_params = {
|
|
'database': settings.DATABASE_NAME,
|
|
}
|
|
conn_params.update(self.options)
|
|
if settings.DATABASE_USER:
|
|
conn_params['user'] = settings.DATABASE_USER
|
|
if settings.DATABASE_PASSWORD:
|
|
conn_params['password'] = settings.DATABASE_PASSWORD
|
|
if settings.DATABASE_HOST:
|
|
conn_params['host'] = settings.DATABASE_HOST
|
|
if settings.DATABASE_PORT:
|
|
conn_params['port'] = settings.DATABASE_PORT
|
|
self.connection = Database.connect(**conn_params)
|
|
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'):
|
|
self.__class__._version = get_version(cursor)
|
|
if self._version < (8, 0):
|
|
# No savepoint support for earlier version of PostgreSQL.
|
|
self.features.uses_savepoints = False
|
|
return cursor
|