103 lines
4.0 KiB
Python
103 lines
4.0 KiB
Python
from django.conf import settings
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from django.core import signals
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from django.core.exceptions import ImproperlyConfigured
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from django.db.utils import ConnectionHandler, load_backend
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from django.utils.functional import curry
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__all__ = ('backend', 'connection', 'connections', 'DatabaseError',
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'IntegrityError', 'DEFAULT_DB_ALIAS')
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DEFAULT_DB_ALIAS = 'default'
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# For backwards compatibility - Port any old database settings over to
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# the new values.
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if not settings.DATABASES:
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import warnings
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warnings.warn(
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"settings.DATABASE_* is deprecated; use settings.DATABASES instead.",
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PendingDeprecationWarning
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)
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settings.DATABASES[DEFAULT_DB_ALIAS] = {
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'ENGINE': settings.DATABASE_ENGINE,
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'HOST': settings.DATABASE_HOST,
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'NAME': settings.DATABASE_NAME,
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'OPTIONS': settings.DATABASE_OPTIONS,
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'PASSWORD': settings.DATABASE_PASSWORD,
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'PORT': settings.DATABASE_PORT,
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'USER': settings.DATABASE_USER,
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'TEST_CHARSET': settings.TEST_DATABASE_CHARSET,
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'TEST_COLLATION': settings.TEST_DATABASE_COLLATION,
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'TEST_NAME': settings.TEST_DATABASE_NAME,
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}
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if DEFAULT_DB_ALIAS not in settings.DATABASES:
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raise ImproperlyConfigured("You must default a '%s' database" % DEFAULT_DB_ALIAS)
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for alias, database in settings.DATABASES.items():
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if database['ENGINE'] in ("postgresql", "postgresql_psycopg2", "sqlite3", "mysql", "oracle"):
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import warnings
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if 'django.contrib.gis' in settings.INSTALLED_APPS:
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warnings.warn(
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"django.contrib.gis is now implemented as a full database backend. "
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"Modify ENGINE in the %s database configuration to select "
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"a backend from 'django.contrib.gis.db.backends'" % alias,
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PendingDeprecationWarning
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)
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if database['ENGINE'] == 'postgresql_psycopg2':
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full_engine = 'django.contrib.gis.db.backends.postgis'
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elif database['ENGINE'] == 'sqlite3':
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full_engine = 'django.contrib.gis.db.backends.spatialite'
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else:
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full_engine = 'django.contrib.gis.db.backends.%s' % database['ENGINE']
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else:
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warnings.warn(
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"Short names for ENGINE in database configurations are deprecated. "
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"Prepend %s.ENGINE with 'django.db.backends.'" % alias,
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PendingDeprecationWarning
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)
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full_engine = "django.db.backends.%s" % database['ENGINE']
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database['ENGINE'] = full_engine
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connections = ConnectionHandler(settings.DATABASES)
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# `connection`, `DatabaseError` and `IntegrityError` are convenient aliases
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# for backend bits.
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# DatabaseWrapper.__init__() takes a dictionary, not a settings module, so
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# we manually create the dictionary from the settings, passing only the
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# settings that the database backends care about. Note that TIME_ZONE is used
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# by the PostgreSQL backends.
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# we load all these up for backwards compatibility, you should use
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# connections['default'] instead.
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connection = connections[DEFAULT_DB_ALIAS]
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backend = load_backend(connection.settings_dict['ENGINE'])
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DatabaseError = backend.DatabaseError
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IntegrityError = backend.IntegrityError
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# Register an event that closes the database connection
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# when a Django request is finished.
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def close_connection(**kwargs):
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for conn in connections.all():
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conn.close()
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signals.request_finished.connect(close_connection)
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# Register an event that resets connection.queries
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# when a Django request is started.
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def reset_queries(**kwargs):
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for conn in connections.all():
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conn.queries = []
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signals.request_started.connect(reset_queries)
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# Register an event that rolls back the connections
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# when a Django request has an exception.
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def _rollback_on_exception(**kwargs):
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from django.db import transaction
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for conn in connections:
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try:
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transaction.rollback_unless_managed(using=conn)
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except DatabaseError:
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pass
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signals.got_request_exception.connect(_rollback_on_exception)
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