app/django/db/backends/postgresql_psycopg2/base.py
author Madhusudan.C.S <madhusudancs@gmail.com>
Wed, 03 Jun 2009 23:38:02 +0530
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"""
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PostgreSQL database backend for Django.
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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