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# Establish the common DatabaseOperations instance, which we call 'db'.
# Much thanks to cmkmrr for a lot of the code base here
from django.conf import settings
import sys
# A few aliases, because there's FQMNs now
engine_modules = {
'django.db.backends.postgresql_psycopg2': 'postgresql_psycopg2',
'django.db.backends.sqlite3': 'sqlite3',
'django.db.backends.mysql': 'mysql',
'mysql_oursql.standard': 'mysql',
'django.db.backends.oracle': 'oracle',
'sql_server.pyodbc': 'sql_server.pyodbc', #django-pyodbc-azure
'django_pyodbc': 'sql_server.pyodbc', #django-pyodbc
'sqlserver_ado': 'sql_server.pyodbc', #django-mssql
'firebird': 'firebird', #django-firebird
'django.contrib.gis.db.backends.postgis': 'postgresql_psycopg2',
'django.contrib.gis.db.backends.spatialite': 'sqlite3',
'django.contrib.gis.db.backends.mysql': 'mysql',
'django.contrib.gis.db.backends.oracle': 'oracle',
'doj.backends.zxjdbc.postgresql': 'postgresql_psycopg2', #django-jython
'doj.backends.zxjdbc.mysql': 'mysql', #django-jython
'doj.backends.zxjdbc.oracle': 'oracle', #django-jython
}
# First, work out if we're multi-db or not, and which databases we have
try:
from django.db import DEFAULT_DB_ALIAS
except ImportError:
#### 1.1 or below ####
# We'll 'fake' multi-db; set the default alias
DEFAULT_DB_ALIAS = 'default'
# SOUTH_DATABASE_ADAPTER is an optional override if you have a different module
engine = getattr(settings, "SOUTH_DATABASE_ADAPTER", "south.db.%s" % settings.DATABASE_ENGINE)
# And then, we have one database with one engine
db_engines = {DEFAULT_DB_ALIAS: engine}
else:
#### 1.2 or above ####
# Loop over the defined databases, gathering up their engines
db_engines = dict([
# Note we check to see if contrib.gis has overridden us.
(alias, "south.db.%s" % engine_modules[db_settings['ENGINE']])
for alias, db_settings in settings.DATABASES.items()
if db_settings['ENGINE'] in engine_modules
])
# Update with any overrides
db_engines.update(getattr(settings, "SOUTH_DATABASE_ADAPTERS", {}))
# Check there's no None engines, or...
for alias, engine in db_engines.items():
if engine is None:
# They've used a backend we don't support
sys.stderr.write(
(
"There is no South database module for your database backend '%s'. " + \
"Please either choose a supported database, check for " + \
"SOUTH_DATABASE_ADAPTER[S] settings, " + \
"or remove South from INSTALLED_APPS.\n"
) % (settings.DATABASES[alias]['ENGINE'],)
)
sys.exit(1)
# Now, turn that into a dict of <alias: south db module>
dbs = {}
try:
for alias, module_name in db_engines.items():
module = __import__(module_name, {}, {}, [''])
dbs[alias] = module.DatabaseOperations(alias)
except ImportError:
# This error should only be triggered on 1.1 and below.
sys.stderr.write(
(
"There is no South database module '%s' for your database. " + \
"Please either choose a supported database, check for " + \
"SOUTH_DATABASE_ADAPTER[S] settings, " + \
"or remove South from INSTALLED_APPS.\n"
) % (module_name,)
)
sys.exit(1)
# Finally, to make old migrations work, keep 'db' around as the default database
db = dbs[DEFAULT_DB_ALIAS]
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