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