def django_table_names(self, only_existing=False):
"""
Returns a list of all table names that have associated Django models and
are in INSTALLED_APPS.
If only_existing is True, the resulting list will only include the tables
that actually exist in the database.
"""
from djangocg.db import models, router
tables = set()
for app in models.get_apps():
for model in models.get_models(app):
if not model._meta.managed:
continue
if not router.allow_syncdb(self.connection.alias, model):
continue
tables.add(model._meta.db_table)
tables.update([f.m2m_db_table() for f in model._meta.local_many_to_many])
tables = list(tables)
if only_existing:
existing_tables = self.table_names()
tables = [
t
for t in tables
if self.table_name_converter(t) in existing_tables
]
return tables
def sequence_list(self):
"Returns a list of information about all DB sequences for all models in all apps."
from djangocg.db import models, router
apps = models.get_apps()
sequence_list = []
for app in apps:
for model in models.get_models(app):
if not model._meta.managed:
continue
if not router.allow_syncdb(self.connection.alias, model):
continue
for f in model._meta.local_fields:
if isinstance(f, models.AutoField):
sequence_list.append({'table': model._meta.db_table, 'column': f.column})
break # Only one AutoField is allowed per model, so don't bother continuing.
for f in model._meta.local_many_to_many:
# If this is an m2m using an intermediate table,
# we don't need to reset the sequence.
if f.rel.through is None:
sequence_list.append({'table': f.m2m_db_table(), 'column': None})
return sequence_list
def get_objects():
# Collate the objects to be serialized.
for model in sort_dependencies(app_list.items()):
if model in excluded_models:
continue
if not model._meta.proxy and router.allow_syncdb(using, model):
if use_base_manager:
objects = model._base_manager
else:
objects = model._default_manager
for obj in objects.using(using).\
order_by(model._meta.pk.name).iterator():
yield obj
def installed_models(self, tables):
"Returns a set of all models represented by the provided list of table names."
from djangocg.db import models, router
all_models = []
for app in models.get_apps():
for model in models.get_models(app):
if router.allow_syncdb(self.connection.alias, model):
all_models.append(model)
tables = list(map(self.table_name_converter, tables))
return set([
m for m in all_models
if self.table_name_converter(m._meta.db_table) in tables
])
def handle_label(self, tablename, **options):
db = options.get('database')
cache = BaseDatabaseCache(tablename, {})
if not router.allow_syncdb(db, cache.cache_model_class):
return
connection = connections[db]
fields = (
# "key" is a reserved word in MySQL, so use "cache_key" instead.
models.CharField(name='cache_key', max_length=255, unique=True, primary_key=True),
models.TextField(name='value'),
models.DateTimeField(name='expires', db_index=True),
)
table_output = []
index_output = []
qn = connection.ops.quote_name
for f in fields:
field_output = [qn(f.name), f.db_type(connection=connection)]
field_output.append("%sNULL" % (not f.null and "NOT " or ""))
if f.primary_key:
field_output.append("PRIMARY KEY")
elif f.unique:
field_output.append("UNIQUE")
if f.db_index:
unique = f.unique and "UNIQUE " or ""
index_output.append("CREATE %sINDEX %s ON %s (%s);" % \
(unique, qn('%s_%s' % (tablename, f.name)), qn(tablename),
qn(f.name)))
table_output.append(" ".join(field_output))
full_statement = ["CREATE TABLE %s (" % qn(tablename)]
for i, line in enumerate(table_output):
full_statement.append(' %s%s' % (line, i < len(table_output)-1 and ',' or ''))
full_statement.append(');')
curs = connection.cursor()
try:
curs.execute("\n".join(full_statement))
except DatabaseError as e:
transaction.rollback_unless_managed(using=db)
raise CommandError(
"Cache table '%s' could not be created.\nThe error was: %s." %
(tablename, force_text(e)))
for statement in index_output:
curs.execute(statement)
transaction.commit_unless_managed(using=db)
def create_default_site(app, created_models, verbosity, db, **kwargs):
# Only create the default sites in databases where Django created the table
if Site in created_models and router.allow_syncdb(db, Site) :
# The default settings set SITE_ID = 1, and some tests in Django's test
# suite rely on this value. However, if database sequences are reused
# (e.g. in the test suite after flush/syncdb), it isn't guaranteed that
# the next id will be 1, so we coerce it. See #15573 and #16353. This
# can also crop up outside of tests - see #15346.
if verbosity >= 2:
print("Creating example.com Site object")
Site(pk=1, domain="example.com", name="example.com").save(using=db)
# We set an explicit pk instead of relying on auto-incrementation,
# so we need to reset the database sequence. See #17415.
sequence_sql = connections[db].ops.sequence_reset_sql(no_style(), [Site])
if sequence_sql:
if verbosity >= 2:
print("Resetting sequence")
cursor = connections[db].cursor()
for command in sequence_sql:
cursor.execute(command)
Site.objects.clear_cache()
def handle_noargs(self, **options):
verbosity = int(options.get("verbosity"))
interactive = options.get("interactive")
show_traceback = options.get("traceback")
load_initial_data = options.get("load_initial_data")
self.style = no_style()
# Import the 'management' module within each installed app, to register
# dispatcher events.
for app_name in settings.INSTALLED_APPS:
try:
import_module(".management", app_name)
except ImportError as exc:
# This is slightly hackish. We want to ignore ImportErrors
# if the "management" module itself is missing -- but we don't
# want to ignore the exception if the management module exists
# but raises an ImportError for some reason. The only way we
# can do this is to check the text of the exception. Note that
# we're a bit broad in how we check the text, because different
# Python implementations may not use the same text.
# CPython uses the text "No module named management"
# PyPy uses "No module named myproject.myapp.management"
msg = exc.args[0]
if not msg.startswith("No module named") or "management" not in msg:
raise
db = options.get("database")
connection = connections[db]
cursor = connection.cursor()
# Get a list of already installed *models* so that references work right.
tables = connection.introspection.table_names()
seen_models = connection.introspection.installed_models(tables)
created_models = set()
pending_references = {}
# Build the manifest of apps and models that are to be synchronized
all_models = [
(
app.__name__.split(".")[-2],
[m for m in models.get_models(app, include_auto_created=True) if router.allow_syncdb(db, m)],
)
for app in models.get_apps()
]
def model_installed(model):
opts = model._meta
converter = connection.introspection.table_name_converter
return not (
(converter(opts.db_table) in tables)
or (opts.auto_created and converter(opts.auto_created._meta.db_table) in tables)
)
manifest = SortedDict(
(app_name, list(filter(model_installed, model_list))) for app_name, model_list in all_models
)
# Create the tables for each model
if verbosity >= 1:
self.stdout.write("Creating tables ...\n")
for app_name, model_list in manifest.items():
for model in model_list:
# Create the model's database table, if it doesn't already exist.
if verbosity >= 3:
self.stdout.write("Processing %s.%s model\n" % (app_name, model._meta.object_name))
sql, references = connection.creation.sql_create_model(model, self.style, seen_models)
seen_models.add(model)
created_models.add(model)
for refto, refs in references.items():
pending_references.setdefault(refto, []).extend(refs)
if refto in seen_models:
sql.extend(
connection.creation.sql_for_pending_references(refto, self.style, pending_references)
)
sql.extend(connection.creation.sql_for_pending_references(model, self.style, pending_references))
if verbosity >= 1 and sql:
self.stdout.write("Creating table %s\n" % model._meta.db_table)
for statement in sql:
cursor.execute(statement)
tables.append(connection.introspection.table_name_converter(model._meta.db_table))
transaction.commit_unless_managed(using=db)
# Send the post_syncdb signal, so individual apps can do whatever they need
# to do at this point.
emit_post_sync_signal(created_models, verbosity, interactive, db)
# The connection may have been closed by a syncdb handler.
cursor = connection.cursor()
# Install custom SQL for the app (but only if this
# is a model we've just created)
if verbosity >= 1:
self.stdout.write("Installing custom SQL ...\n")
for app_name, model_list in manifest.items():
for model in model_list:
if model in created_models:
custom_sql = custom_sql_for_model(model, self.style, connection)
if custom_sql:
if verbosity >= 2:
self.stdout.write(
"Installing custom SQL for %s.%s model\n" % (app_name, model._meta.object_name)
)
try:
for sql in custom_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write(
"Failed to install custom SQL for %s.%s model: %s\n"
% (app_name, model._meta.object_name, e)
)
if show_traceback:
traceback.print_exc()
transaction.rollback_unless_managed(using=db)
else:
transaction.commit_unless_managed(using=db)
else:
if verbosity >= 3:
self.stdout.write("No custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
if verbosity >= 1:
self.stdout.write("Installing indexes ...\n")
# Install SQL indices for all newly created models
for app_name, model_list in manifest.items():
for model in model_list:
if model in created_models:
index_sql = connection.creation.sql_indexes_for_model(model, self.style)
if index_sql:
if verbosity >= 2:
self.stdout.write(
"Installing index for %s.%s model\n" % (app_name, model._meta.object_name)
)
try:
for sql in index_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write(
"Failed to install index for %s.%s model: %s\n" % (app_name, model._meta.object_name, e)
)
transaction.rollback_unless_managed(using=db)
else:
transaction.commit_unless_managed(using=db)
# Load initial_data fixtures (unless that has been disabled)
if load_initial_data:
call_command("loaddata", "initial_data", verbosity=verbosity, database=db, skip_validation=True)
def handle_noargs(self, **options):
db = options.get('database')
connection = connections[db]
verbosity = int(options.get('verbosity'))
interactive = options.get('interactive')
# 'reset_sequences' is a stealth option
reset_sequences = options.get('reset_sequences', True)
self.style = no_style()
# Import the 'management' module within each installed app, to register
# dispatcher events.
for app_name in settings.INSTALLED_APPS:
try:
import_module('.management', app_name)
except ImportError:
pass
sql_list = sql_flush(self.style, connection, only_django=True, reset_sequences=reset_sequences)
if interactive:
confirm = input("""You have requested a flush of the database.
This will IRREVERSIBLY DESTROY all data currently in the %r database,
and return each table to the state it was in after syncdb.
Are you sure you want to do this?
Type 'yes' to continue, or 'no' to cancel: """ % connection.settings_dict['NAME'])
else:
confirm = 'yes'
if confirm == 'yes':
try:
cursor = connection.cursor()
for sql in sql_list:
cursor.execute(sql)
except Exception as e:
transaction.rollback_unless_managed(using=db)
raise CommandError("""Database %s couldn't be flushed. Possible reasons:
* The database isn't running or isn't configured correctly.
* At least one of the expected database tables doesn't exist.
* The SQL was invalid.
Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL this command wasn't able to run.
The full error: %s""" % (connection.settings_dict['NAME'], e))
transaction.commit_unless_managed(using=db)
# Emit the post sync signal. This allows individual
# applications to respond as if the database had been
# sync'd from scratch.
all_models = []
for app in models.get_apps():
all_models.extend([
m for m in models.get_models(app, include_auto_created=True)
if router.allow_syncdb(db, m)
])
emit_post_sync_signal(set(all_models), verbosity, interactive, db)
# Reinstall the initial_data fixture.
kwargs = options.copy()
kwargs['database'] = db
if options.get('load_initial_data'):
# Reinstall the initial_data fixture.
call_command('loaddata', 'initial_data', **options)
else:
self.stdout.write("Flush cancelled.\n")
def handle(self, *fixture_labels, **options):
using = options.get('database')
connection = connections[using]
if not len(fixture_labels):
raise CommandError(
"No database fixture specified. Please provide the path of at "
"least one fixture in the command line."
)
verbosity = int(options.get('verbosity'))
show_traceback = options.get('traceback')
# commit is a stealth option - it isn't really useful as
# a command line option, but it can be useful when invoking
# loaddata from within another script.
# If commit=True, loaddata will use its own transaction;
# if commit=False, the data load SQL will become part of
# the transaction in place when loaddata was invoked.
commit = options.get('commit', True)
# Keep a count of the installed objects and fixtures
fixture_count = 0
loaded_object_count = 0
fixture_object_count = 0
models = set()
humanize = lambda dirname: "'%s'" % dirname if dirname else 'absolute path'
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database (if
# it isn't already initialized).
cursor = connection.cursor()
# Start transaction management. All fixtures are installed in a
# single transaction to ensure that all references are resolved.
if commit:
transaction.commit_unless_managed(using=using)
transaction.enter_transaction_management(using=using)
transaction.managed(True, using=using)
class SingleZipReader(zipfile.ZipFile):
def __init__(self, *args, **kwargs):
zipfile.ZipFile.__init__(self, *args, **kwargs)
if settings.DEBUG:
assert len(self.namelist()) == 1, "Zip-compressed fixtures must contain only one file."
def read(self):
return zipfile.ZipFile.read(self, self.namelist()[0])
compression_types = {
None: open,
'gz': gzip.GzipFile,
'zip': SingleZipReader
}
if has_bz2:
compression_types['bz2'] = bz2.BZ2File
app_module_paths = []
for app in get_apps():
if hasattr(app, '__path__'):
# It's a 'models/' subpackage
for path in app.__path__:
app_module_paths.append(path)
else:
# It's a models.py module
app_module_paths.append(app.__file__)
app_fixtures = [os.path.join(os.path.dirname(path), 'fixtures') for path in app_module_paths]
try:
with connection.constraint_checks_disabled():
for fixture_label in fixture_labels:
parts = fixture_label.split('.')
if len(parts) > 1 and parts[-1] in compression_types:
compression_formats = [parts[-1]]
parts = parts[:-1]
else:
compression_formats = compression_types.keys()
if len(parts) == 1:
fixture_name = parts[0]
formats = serializers.get_public_serializer_formats()
else:
fixture_name, format = '.'.join(parts[:-1]), parts[-1]
if format in serializers.get_public_serializer_formats():
formats = [format]
else:
formats = []
if formats:
if verbosity >= 2:
self.stdout.write("Loading '%s' fixtures..." % fixture_name)
else:
raise CommandError(
"Problem installing fixture '%s': %s is not a known serialization format." %
(fixture_name, format))
if os.path.isabs(fixture_name):
fixture_dirs = [fixture_name]
else:
fixture_dirs = app_fixtures + list(settings.FIXTURE_DIRS) + ['']
for fixture_dir in fixture_dirs:
if verbosity >= 2:
self.stdout.write("Checking %s for fixtures..." % humanize(fixture_dir))
label_found = False
for combo in product([using, None], formats, compression_formats):
database, format, compression_format = combo
file_name = '.'.join(
p for p in [
fixture_name, database, format, compression_format
]
if p
)
if verbosity >= 3:
self.stdout.write("Trying %s for %s fixture '%s'..." % \
(humanize(fixture_dir), file_name, fixture_name))
full_path = os.path.join(fixture_dir, file_name)
open_method = compression_types[compression_format]
try:
fixture = open_method(full_path, 'r')
except IOError:
if verbosity >= 2:
self.stdout.write("No %s fixture '%s' in %s." % \
(format, fixture_name, humanize(fixture_dir)))
else:
try:
if label_found:
raise CommandError("Multiple fixtures named '%s' in %s. Aborting." %
(fixture_name, humanize(fixture_dir)))
fixture_count += 1
objects_in_fixture = 0
loaded_objects_in_fixture = 0
if verbosity >= 2:
self.stdout.write("Installing %s fixture '%s' from %s." % \
(format, fixture_name, humanize(fixture_dir)))
objects = serializers.deserialize(format, fixture, using=using)
for obj in objects:
objects_in_fixture += 1
if router.allow_syncdb(using, obj.object.__class__):
loaded_objects_in_fixture += 1
models.add(obj.object.__class__)
try:
obj.save(using=using)
except (DatabaseError, IntegrityError) as e:
e.args = ("Could not load %(app_label)s.%(object_name)s(pk=%(pk)s): %(error_msg)s" % {
'app_label': obj.object._meta.app_label,
'object_name': obj.object._meta.object_name,
'pk': obj.object.pk,
'error_msg': force_text(e)
},)
raise
loaded_object_count += loaded_objects_in_fixture
fixture_object_count += objects_in_fixture
label_found = True
except Exception as e:
if not isinstance(e, CommandError):
e.args = ("Problem installing fixture '%s': %s" % (full_path, e),)
raise
finally:
fixture.close()
# If the fixture we loaded contains 0 objects, assume that an
# error was encountered during fixture loading.
if objects_in_fixture == 0:
raise CommandError(
"No fixture data found for '%s'. (File format may be invalid.)" %
(fixture_name))
# Since we disabled constraint checks, we must manually check for
# any invalid keys that might have been added
table_names = [model._meta.db_table for model in models]
try:
connection.check_constraints(table_names=table_names)
except Exception as e:
e.args = ("Problem installing fixtures: %s" % e,)
raise
except (SystemExit, KeyboardInterrupt):
raise
except Exception as e:
if commit:
transaction.rollback(using=using)
transaction.leave_transaction_management(using=using)
raise
# If we found even one object in a fixture, we need to reset the
# database sequences.
if loaded_object_count > 0:
sequence_sql = connection.ops.sequence_reset_sql(no_style(), models)
if sequence_sql:
if verbosity >= 2:
self.stdout.write("Resetting sequences\n")
for line in sequence_sql:
cursor.execute(line)
if commit:
transaction.commit(using=using)
transaction.leave_transaction_management(using=using)
if verbosity >= 1:
if fixture_object_count == loaded_object_count:
self.stdout.write("Installed %d object(s) from %d fixture(s)" % (
loaded_object_count, fixture_count))
else:
self.stdout.write("Installed %d object(s) (of %d) from %d fixture(s)" % (
loaded_object_count, fixture_object_count, fixture_count))
# Close the DB connection. This is required as a workaround for an
# edge case in MySQL: if the same connection is used to
# create tables, load data, and query, the query can return
# incorrect results. See Django #7572, MySQL #37735.
if commit:
connection.close()
