77 lines
3.0 KiB
Python
77 lines
3.0 KiB
Python
"""
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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 BaseDatabaseWrapper, BaseDatabaseFeatures
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from django.db.backends.postgresql.operations import DatabaseOperations as PostgresqlDatabaseOperations
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from django.utils.safestring import SafeUnicode
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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(SafeUnicode, psycopg2.extensions.QuotedString)
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class DatabaseFeatures(BaseDatabaseFeatures):
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needs_datetime_string_cast = False
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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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features = DatabaseFeatures()
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ops = DatabaseOperations()
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operators = {
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'exact': '= %s',
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'iexact': 'ILIKE %s',
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'contains': 'LIKE %s',
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'icontains': 'ILIKE %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': 'ILIKE %s',
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'iendswith': 'ILIKE %s',
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}
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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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return cursor
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