author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:20:23 +0000 | |
changeset 2125 | c24e8423cd1a |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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PostgreSQL database backend for Django. |
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|
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Requires psycopg 2: http://initd.org/projects/psycopg2 |
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""" |
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from django.db.backends import * |
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from django.db.backends.postgresql.operations import DatabaseOperations as PostgresqlDatabaseOperations |
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from django.db.backends.postgresql.client import DatabaseClient |
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from django.db.backends.postgresql.creation import DatabaseCreation |
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from django.db.backends.postgresql.version import get_version |
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from django.db.backends.postgresql_psycopg2.introspection import DatabaseIntrospection |
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from django.utils.safestring import SafeUnicode, SafeString |
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try: |
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import psycopg2 as Database |
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import psycopg2.extensions |
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except ImportError, e: |
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from django.core.exceptions import ImproperlyConfigured |
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raise ImproperlyConfigured("Error loading psycopg2 module: %s" % e) |
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DatabaseError = Database.DatabaseError |
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IntegrityError = Database.IntegrityError |
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psycopg2.extensions.register_type(psycopg2.extensions.UNICODE) |
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psycopg2.extensions.register_adapter(SafeString, psycopg2.extensions.QuotedString) |
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psycopg2.extensions.register_adapter(SafeUnicode, psycopg2.extensions.QuotedString) |
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class DatabaseFeatures(BaseDatabaseFeatures): |
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needs_datetime_string_cast = False |
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uses_savepoints = True |
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class DatabaseOperations(PostgresqlDatabaseOperations): |
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def last_executed_query(self, cursor, sql, params): |
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# With psycopg2, cursor objects have a "query" attribute that is the |
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# exact query sent to the database. See docs here: |
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# http://www.initd.org/tracker/psycopg/wiki/psycopg2_documentation#postgresql-status-message-and-executed-query |
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return cursor.query |
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class DatabaseWrapper(BaseDatabaseWrapper): |
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operators = { |
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'exact': '= %s', |
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'iexact': '= UPPER(%s)', |
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'contains': 'LIKE %s', |
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'icontains': 'LIKE UPPER(%s)', |
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'regex': '~ %s', |
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'iregex': '~* %s', |
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'gt': '> %s', |
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'gte': '>= %s', |
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'lt': '< %s', |
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'lte': '<= %s', |
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'startswith': 'LIKE %s', |
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'endswith': 'LIKE %s', |
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'istartswith': 'LIKE UPPER(%s)', |
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'iendswith': 'LIKE UPPER(%s)', |
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} |
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def __init__(self, *args, **kwargs): |
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super(DatabaseWrapper, self).__init__(*args, **kwargs) |
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self.features = DatabaseFeatures() |
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self.ops = DatabaseOperations() |
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self.client = DatabaseClient() |
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self.creation = DatabaseCreation(self) |
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self.introspection = DatabaseIntrospection(self) |
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self.validation = BaseDatabaseValidation() |
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def _cursor(self, settings): |
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set_tz = False |
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if self.connection is None: |
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set_tz = True |
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if settings.DATABASE_NAME == '': |
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from django.core.exceptions import ImproperlyConfigured |
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raise ImproperlyConfigured("You need to specify DATABASE_NAME in your Django settings file.") |
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conn_string = "dbname=%s" % settings.DATABASE_NAME |
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if settings.DATABASE_USER: |
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conn_string = "user=%s %s" % (settings.DATABASE_USER, conn_string) |
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if settings.DATABASE_PASSWORD: |
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conn_string += " password='%s'" % settings.DATABASE_PASSWORD |
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if settings.DATABASE_HOST: |
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conn_string += " host=%s" % settings.DATABASE_HOST |
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if settings.DATABASE_PORT: |
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conn_string += " port=%s" % settings.DATABASE_PORT |
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self.connection = Database.connect(conn_string, **self.options) |
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self.connection.set_isolation_level(1) # make transactions transparent to all cursors |
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self.connection.set_client_encoding('UTF8') |
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cursor = self.connection.cursor() |
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cursor.tzinfo_factory = None |
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if set_tz: |
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cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE]) |
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if not hasattr(self, '_version'): |
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self.__class__._version = get_version(cursor) |
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if self._version < (8, 0): |
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# No savepoint support for earlier version of PostgreSQL. |
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self.features.uses_savepoints = False |
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return cursor |