| """ |
| 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 |