def __init__(self,
database_name=None,
config_file=None,
database_type=None):
# Get the configuration
self.config = MagpyConfigParser(config_file)
# Get the database engine type
if not database_type:
database_type = self.config.databases['default']['ENGINE']
# Get the client class
if database_type == 'ainodb':
from ainodb import Client
from ainodb.errors import ConnectionFailure
else:
try:
from pymongo import MongoClient as Client
except ImportError:
from pymongo import Connection as Client
from pymongo.errors import ConnectionFailure
# Make a connection
try:
self.connection = Client(tz_aware=True)
except ConnectionFailure:
print("Could not connect to the database.")
print("Are you sure it is installed and is running?")
print("The exception is shown below.")
print("")
raise
# Get the database
if not database_name:
if DEFAULT_DATABASE:
database_name = DEFAULT_DATABASE
else:
database_name = self.config.databases['default']['NAME']
self._database_name = database_name
self.database = self.connection[database_name]
class Database(object):
"""Simple database connection for use in serverside scripts etc."""
def __init__(self,
database_name=None,
config_file=None,
database_type=None):
# Get the configuration
self.config = MagpyConfigParser(config_file)
# Get the database engine type
if not database_type:
database_type = self.config.databases['default']['ENGINE']
# Get the client class
if database_type == 'ainodb':
from ainodb import Client
from ainodb.errors import ConnectionFailure
else:
try:
from pymongo import MongoClient as Client
except ImportError:
from pymongo import Connection as Client
from pymongo.errors import ConnectionFailure
# Make a connection
try:
self.connection = Client(tz_aware=True)
except ConnectionFailure:
print("Could not connect to the database.")
print("Are you sure it is installed and is running?")
print("The exception is shown below.")
print("")
raise
# Get the database
if not database_name:
if DEFAULT_DATABASE:
database_name = DEFAULT_DATABASE
else:
database_name = self.config.databases['default']['NAME']
self._database_name = database_name
self.database = self.connection[database_name]
def drop_database(self):
"""Drop the whole database."""
self.connection.drop_database(self.database)
self.database = self.connection[self._database_name]
def get_collection(self, collection):
"""Get a collection by name."""
return self.database[collection]
def drop_collection(self, collection):
"""Drop a collection by name."""
self.database.drop_collection(collection)
def drop_collections(self, collections):
"""Drop a named tuple or list of collections."""
for collection in collections:
self.drop_collection(collection)
def get_setting_category(self, category):
"""Get a setting category from the database."""
settings = self.get_collection('_settings')
return settings.find_one({'_id': category})
def get_setting(self, category, setting):
"""Get a setting from the database."""
category = self.get_setting_category(category)
if not category:
return None
try:
return category[setting]
except KeyError:
return None
def add_setting(self, category, setting, value):
"""Add a setting to the database."""
category_instance = self.get_setting_category(category)
if category_instance:
category_instance[setting] = value
else:
category_instance = {'_id': category,
setting: value}
settings = self.get_collection('_settings')
settings.save(category_instance)
def remove_setting(self, category, setting):
"""Remove a setting from the database."""
category_instance = self.get_setting_category(category)
if not category_instance:
return
if not setting in category_instance:
return
del category_instance[setting]
settings = self.get_collection('_settings')
if len(category_instance.keys()) == 1:
settings.remove(category_instance['_id'])
else:
settings.update(category_instance)
def add_list_setting(self, category, setting, value):
"""Add a value to a list setting."""
category_instance = self.get_setting_category(category)
if category_instance:
if not setting in category_instance:
category_instance['setting'] = []
else:
category_instance = {'_id': category,
setting: []}
if value not in category_instance[setting]:
category_instance[setting].append(value)
settings = self.get_collection('_settings')
settings.save(category_instance)
else:
print("Already set, skipping.")
def remove_list_setting(self, category, setting, value):
"""Add a value to a list setting."""
category_instance = self.get_setting_category(category)
# To remove the value from the setting, the setting must exist
if not category_instance:
return
if not setting in category_instance:
return
# Now lets try to remove the named setting
try:
category_instance[setting].remove(value)
except ValueError:
# It was not in the list.
return
settings = self.get_collection('_settings')
settings.save(category_instance)
return
def get_app_list(self):
"""Get the list of installed applications from the database."""
return self.get_setting('applications', 'installed_apps')
def add_app(self, app_name):
"""Add an app name to the list of installed applications."""
self.add_list_setting('applications', 'installed_apps', app_name)
def remove_app(self, app_name):
"""Remove an app name from the list of installed applications."""
self.remove_list_setting('applications', 'installed_apps',
app_name)
def get_model(self, model_name):
"""Get a model."""
models = self.get_collection('_model')
return models.find_one({'_id': model_name})
def index(self, model_name, field_name, force=False):
"""Create an index for the field,
(if the index does not already exist)."""
model = self.get_model(model_name)
field = model[field_name]
if 'index' in field:
if field['index'] is False and force is False:
raise ModelIndexError(
"Field definition has index: False. "
"Use force=True to override.")
collection = self.get_collection(model_name)
collection.ensure_index(field_name)
def add_instance(self, instance,
skip_validation=False,
handle_none=False):
"""Add an instance to the db."""
model_name = instance['_model']
if not skip_validation:
model = self.get_model(model_name)
try:
validate_model_instance(model,
instance,
handle_none=handle_none)
except ValidationError:
print("Died on instance:")
print(instance)
raise
# We got this far, yay!
instance_collection = self.get_collection(model_name)
instance_collection.save(instance)
sys.stdout.write(model_name[0])
def add_instances(self, instances,
skip_validation=False,
handle_none=False):
"""All several instances to the db."""
for instance in instances:
self.add_instance(instance, skip_validation, handle_none)
