492 lines
20 KiB
Python
492 lines
20 KiB
Python
import hashlib
|
|
import sys
|
|
import time
|
|
import warnings
|
|
|
|
from django.conf import settings
|
|
from django.db.utils import load_backend
|
|
from django.utils.encoding import force_bytes
|
|
from django.utils.six.moves import input
|
|
|
|
from .utils import truncate_name
|
|
|
|
# The prefix to put on the default database name when creating
|
|
# the test database.
|
|
TEST_DATABASE_PREFIX = 'test_'
|
|
|
|
|
|
class BaseDatabaseCreation(object):
|
|
"""
|
|
This class encapsulates all backend-specific differences that pertain to
|
|
database *creation*, such as the column types to use for particular Django
|
|
Fields, the SQL used to create and destroy tables, and the creation and
|
|
destruction of test databases.
|
|
"""
|
|
data_types = {}
|
|
data_types_suffix = {}
|
|
data_type_check_constraints = {}
|
|
|
|
def __init__(self, connection):
|
|
self.connection = connection
|
|
|
|
@classmethod
|
|
def _digest(cls, *args):
|
|
"""
|
|
Generates a 32-bit digest of a set of arguments that can be used to
|
|
shorten identifying names.
|
|
"""
|
|
h = hashlib.md5()
|
|
for arg in args:
|
|
h.update(force_bytes(arg))
|
|
return h.hexdigest()[:8]
|
|
|
|
def sql_create_model(self, model, style, known_models=set()):
|
|
"""
|
|
Returns the SQL required to create a single model, as a tuple of:
|
|
(list_of_sql, pending_references_dict)
|
|
"""
|
|
opts = model._meta
|
|
if not opts.managed or opts.proxy or opts.swapped:
|
|
return [], {}
|
|
final_output = []
|
|
table_output = []
|
|
pending_references = {}
|
|
qn = self.connection.ops.quote_name
|
|
for f in opts.local_fields:
|
|
col_type = f.db_type(connection=self.connection)
|
|
col_type_suffix = f.db_type_suffix(connection=self.connection)
|
|
tablespace = f.db_tablespace or opts.db_tablespace
|
|
if col_type is None:
|
|
# Skip ManyToManyFields, because they're not represented as
|
|
# database columns in this table.
|
|
continue
|
|
# Make the definition (e.g. 'foo VARCHAR(30)') for this field.
|
|
field_output = [style.SQL_FIELD(qn(f.column)),
|
|
style.SQL_COLTYPE(col_type)]
|
|
# Oracle treats the empty string ('') as null, so coerce the null
|
|
# option whenever '' is a possible value.
|
|
null = f.null
|
|
if (f.empty_strings_allowed and not f.primary_key and
|
|
self.connection.features.interprets_empty_strings_as_nulls):
|
|
null = True
|
|
if not null:
|
|
field_output.append(style.SQL_KEYWORD('NOT NULL'))
|
|
if f.primary_key:
|
|
field_output.append(style.SQL_KEYWORD('PRIMARY KEY'))
|
|
elif f.unique:
|
|
field_output.append(style.SQL_KEYWORD('UNIQUE'))
|
|
if tablespace and f.unique:
|
|
# We must specify the index tablespace inline, because we
|
|
# won't be generating a CREATE INDEX statement for this field.
|
|
tablespace_sql = self.connection.ops.tablespace_sql(
|
|
tablespace, inline=True)
|
|
if tablespace_sql:
|
|
field_output.append(tablespace_sql)
|
|
if f.rel and f.db_constraint:
|
|
ref_output, pending = self.sql_for_inline_foreign_key_references(
|
|
model, f, known_models, style)
|
|
if pending:
|
|
pending_references.setdefault(f.rel.to, []).append(
|
|
(model, f))
|
|
else:
|
|
field_output.extend(ref_output)
|
|
if col_type_suffix:
|
|
field_output.append(style.SQL_KEYWORD(col_type_suffix))
|
|
table_output.append(' '.join(field_output))
|
|
for field_constraints in opts.unique_together:
|
|
table_output.append(style.SQL_KEYWORD('UNIQUE') + ' (%s)' %
|
|
", ".join(
|
|
[style.SQL_FIELD(qn(opts.get_field(f).column))
|
|
for f in field_constraints]))
|
|
|
|
full_statement = [style.SQL_KEYWORD('CREATE TABLE') + ' ' +
|
|
style.SQL_TABLE(qn(opts.db_table)) + ' (']
|
|
for i, line in enumerate(table_output): # Combine and add commas.
|
|
full_statement.append(
|
|
' %s%s' % (line, ',' if i < len(table_output) - 1 else ''))
|
|
full_statement.append(')')
|
|
if opts.db_tablespace:
|
|
tablespace_sql = self.connection.ops.tablespace_sql(
|
|
opts.db_tablespace)
|
|
if tablespace_sql:
|
|
full_statement.append(tablespace_sql)
|
|
full_statement.append(';')
|
|
final_output.append('\n'.join(full_statement))
|
|
|
|
if opts.has_auto_field:
|
|
# Add any extra SQL needed to support auto-incrementing primary
|
|
# keys.
|
|
auto_column = opts.auto_field.db_column or opts.auto_field.name
|
|
autoinc_sql = self.connection.ops.autoinc_sql(opts.db_table,
|
|
auto_column)
|
|
if autoinc_sql:
|
|
for stmt in autoinc_sql:
|
|
final_output.append(stmt)
|
|
|
|
return final_output, pending_references
|
|
|
|
def sql_for_inline_foreign_key_references(self, model, field, known_models, style):
|
|
"""
|
|
Return the SQL snippet defining the foreign key reference for a field.
|
|
"""
|
|
qn = self.connection.ops.quote_name
|
|
rel_to = field.rel.to
|
|
if rel_to in known_models or rel_to == model:
|
|
output = [style.SQL_KEYWORD('REFERENCES') + ' ' +
|
|
style.SQL_TABLE(qn(rel_to._meta.db_table)) + ' (' +
|
|
style.SQL_FIELD(qn(rel_to._meta.get_field(
|
|
field.rel.field_name).column)) + ')' +
|
|
self.connection.ops.deferrable_sql()
|
|
]
|
|
pending = False
|
|
else:
|
|
# We haven't yet created the table to which this field
|
|
# is related, so save it for later.
|
|
output = []
|
|
pending = True
|
|
|
|
return output, pending
|
|
|
|
def sql_for_pending_references(self, model, style, pending_references):
|
|
"""
|
|
Returns any ALTER TABLE statements to add constraints after the fact.
|
|
"""
|
|
opts = model._meta
|
|
if not opts.managed or opts.swapped:
|
|
return []
|
|
qn = self.connection.ops.quote_name
|
|
final_output = []
|
|
if model in pending_references:
|
|
for rel_class, f in pending_references[model]:
|
|
rel_opts = rel_class._meta
|
|
r_table = rel_opts.db_table
|
|
r_col = f.column
|
|
table = opts.db_table
|
|
col = opts.get_field(f.rel.field_name).column
|
|
# For MySQL, r_name must be unique in the first 64 characters.
|
|
# So we are careful with character usage here.
|
|
r_name = '%s_refs_%s_%s' % (
|
|
r_col, col, self._digest(r_table, table))
|
|
final_output.append(style.SQL_KEYWORD('ALTER TABLE') +
|
|
' %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s (%s)%s;' %
|
|
(qn(r_table), qn(truncate_name(
|
|
r_name, self.connection.ops.max_name_length())),
|
|
qn(r_col), qn(table), qn(col),
|
|
self.connection.ops.deferrable_sql()))
|
|
del pending_references[model]
|
|
return final_output
|
|
|
|
def sql_indexes_for_model(self, model, style):
|
|
"""
|
|
Returns the CREATE INDEX SQL statements for a single model.
|
|
"""
|
|
if not model._meta.managed or model._meta.proxy or model._meta.swapped:
|
|
return []
|
|
output = []
|
|
for f in model._meta.local_fields:
|
|
output.extend(self.sql_indexes_for_field(model, f, style))
|
|
for fs in model._meta.index_together:
|
|
fields = [model._meta.get_field_by_name(f)[0] for f in fs]
|
|
output.extend(self.sql_indexes_for_fields(model, fields, style))
|
|
return output
|
|
|
|
def sql_indexes_for_field(self, model, f, style):
|
|
"""
|
|
Return the CREATE INDEX SQL statements for a single model field.
|
|
"""
|
|
if f.db_index and not f.unique:
|
|
return self.sql_indexes_for_fields(model, [f], style)
|
|
else:
|
|
return []
|
|
|
|
def sql_indexes_for_fields(self, model, fields, style):
|
|
if len(fields) == 1 and fields[0].db_tablespace:
|
|
tablespace_sql = self.connection.ops.tablespace_sql(fields[0].db_tablespace)
|
|
elif model._meta.db_tablespace:
|
|
tablespace_sql = self.connection.ops.tablespace_sql(model._meta.db_tablespace)
|
|
else:
|
|
tablespace_sql = ""
|
|
if tablespace_sql:
|
|
tablespace_sql = " " + tablespace_sql
|
|
|
|
field_names = []
|
|
qn = self.connection.ops.quote_name
|
|
for f in fields:
|
|
field_names.append(style.SQL_FIELD(qn(f.column)))
|
|
|
|
index_name = "%s_%s" % (model._meta.db_table, self._digest([f.name for f in fields]))
|
|
|
|
return [
|
|
style.SQL_KEYWORD("CREATE INDEX") + " " +
|
|
style.SQL_TABLE(qn(truncate_name(index_name, self.connection.ops.max_name_length()))) + " " +
|
|
style.SQL_KEYWORD("ON") + " " +
|
|
style.SQL_TABLE(qn(model._meta.db_table)) + " " +
|
|
"(%s)" % style.SQL_FIELD(", ".join(field_names)) +
|
|
"%s;" % tablespace_sql,
|
|
]
|
|
|
|
def sql_destroy_model(self, model, references_to_delete, style):
|
|
"""
|
|
Return the DROP TABLE and restraint dropping statements for a single
|
|
model.
|
|
"""
|
|
if not model._meta.managed or model._meta.proxy or model._meta.swapped:
|
|
return []
|
|
# Drop the table now
|
|
qn = self.connection.ops.quote_name
|
|
output = ['%s %s;' % (style.SQL_KEYWORD('DROP TABLE'),
|
|
style.SQL_TABLE(qn(model._meta.db_table)))]
|
|
if model in references_to_delete:
|
|
output.extend(self.sql_remove_table_constraints(
|
|
model, references_to_delete, style))
|
|
if model._meta.has_auto_field:
|
|
ds = self.connection.ops.drop_sequence_sql(model._meta.db_table)
|
|
if ds:
|
|
output.append(ds)
|
|
return output
|
|
|
|
def sql_remove_table_constraints(self, model, references_to_delete, style):
|
|
if not model._meta.managed or model._meta.proxy or model._meta.swapped:
|
|
return []
|
|
output = []
|
|
qn = self.connection.ops.quote_name
|
|
for rel_class, f in references_to_delete[model]:
|
|
table = rel_class._meta.db_table
|
|
col = f.column
|
|
r_table = model._meta.db_table
|
|
r_col = model._meta.get_field(f.rel.field_name).column
|
|
r_name = '%s_refs_%s_%s' % (
|
|
col, r_col, self._digest(table, r_table))
|
|
output.append('%s %s %s %s;' % (
|
|
style.SQL_KEYWORD('ALTER TABLE'),
|
|
style.SQL_TABLE(qn(table)),
|
|
style.SQL_KEYWORD(self.connection.ops.drop_foreignkey_sql()),
|
|
style.SQL_FIELD(qn(truncate_name(
|
|
r_name, self.connection.ops.max_name_length())))
|
|
))
|
|
del references_to_delete[model]
|
|
return output
|
|
|
|
def sql_destroy_indexes_for_model(self, model, style):
|
|
"""
|
|
Returns the DROP INDEX SQL statements for a single model.
|
|
"""
|
|
if not model._meta.managed or model._meta.proxy or model._meta.swapped:
|
|
return []
|
|
output = []
|
|
for f in model._meta.local_fields:
|
|
output.extend(self.sql_destroy_indexes_for_field(model, f, style))
|
|
for fs in model._meta.index_together:
|
|
fields = [model._meta.get_field_by_name(f)[0] for f in fs]
|
|
output.extend(self.sql_destroy_indexes_for_fields(model, fields, style))
|
|
return output
|
|
|
|
def sql_destroy_indexes_for_field(self, model, f, style):
|
|
"""
|
|
Return the DROP INDEX SQL statements for a single model field.
|
|
"""
|
|
if f.db_index and not f.unique:
|
|
return self.sql_destroy_indexes_for_fields(model, [f], style)
|
|
else:
|
|
return []
|
|
|
|
def sql_destroy_indexes_for_fields(self, model, fields, style):
|
|
if len(fields) == 1 and fields[0].db_tablespace:
|
|
tablespace_sql = self.connection.ops.tablespace_sql(fields[0].db_tablespace)
|
|
elif model._meta.db_tablespace:
|
|
tablespace_sql = self.connection.ops.tablespace_sql(model._meta.db_tablespace)
|
|
else:
|
|
tablespace_sql = ""
|
|
if tablespace_sql:
|
|
tablespace_sql = " " + tablespace_sql
|
|
|
|
field_names = []
|
|
qn = self.connection.ops.quote_name
|
|
for f in fields:
|
|
field_names.append(style.SQL_FIELD(qn(f.column)))
|
|
|
|
index_name = "%s_%s" % (model._meta.db_table, self._digest([f.name for f in fields]))
|
|
|
|
return [
|
|
style.SQL_KEYWORD("DROP INDEX") + " " +
|
|
style.SQL_TABLE(qn(truncate_name(index_name, self.connection.ops.max_name_length()))) + " " +
|
|
";",
|
|
]
|
|
|
|
def create_test_db(self, verbosity=1, autoclobber=False):
|
|
"""
|
|
Creates a test database, prompting the user for confirmation if the
|
|
database already exists. Returns the name of the test database created.
|
|
"""
|
|
# Don't import django.core.management if it isn't needed.
|
|
from django.core.management import call_command
|
|
|
|
test_database_name = self._get_test_db_name()
|
|
|
|
if verbosity >= 1:
|
|
test_db_repr = ''
|
|
if verbosity >= 2:
|
|
test_db_repr = " ('%s')" % test_database_name
|
|
print("Creating test database for alias '%s'%s..." % (
|
|
self.connection.alias, test_db_repr))
|
|
|
|
self._create_test_db(verbosity, autoclobber)
|
|
|
|
self.connection.close()
|
|
settings.DATABASES[self.connection.alias]["NAME"] = test_database_name
|
|
self.connection.settings_dict["NAME"] = test_database_name
|
|
|
|
# Report migrate messages at one level lower than that requested.
|
|
# This ensures we don't get flooded with messages during testing
|
|
# (unless you really ask to be flooded)
|
|
call_command('migrate',
|
|
verbosity=max(verbosity - 1, 0),
|
|
interactive=False,
|
|
database=self.connection.alias,
|
|
load_initial_data=False,
|
|
test_database=True)
|
|
|
|
# We need to then do a flush to ensure that any data installed by
|
|
# custom SQL has been removed. The only test data should come from
|
|
# test fixtures, or autogenerated from post_migrate triggers.
|
|
# This has the side effect of loading initial data (which was
|
|
# intentionally skipped in the syncdb).
|
|
call_command('flush',
|
|
verbosity=max(verbosity - 1, 0),
|
|
interactive=False,
|
|
database=self.connection.alias)
|
|
|
|
call_command('createcachetable', database=self.connection.alias)
|
|
|
|
# Get a cursor (even though we don't need one yet). This has
|
|
# the side effect of initializing the test database.
|
|
self.connection.cursor()
|
|
|
|
return test_database_name
|
|
|
|
def _get_test_db_name(self):
|
|
"""
|
|
Internal implementation - returns the name of the test DB that will be
|
|
created. Only useful when called from create_test_db() and
|
|
_create_test_db() and when no external munging is done with the 'NAME'
|
|
or 'TEST_NAME' settings.
|
|
"""
|
|
if self.connection.settings_dict['TEST_NAME']:
|
|
return self.connection.settings_dict['TEST_NAME']
|
|
return TEST_DATABASE_PREFIX + self.connection.settings_dict['NAME']
|
|
|
|
def _create_test_db(self, verbosity, autoclobber):
|
|
"""
|
|
Internal implementation - creates the test db tables.
|
|
"""
|
|
suffix = self.sql_table_creation_suffix()
|
|
|
|
test_database_name = self._get_test_db_name()
|
|
|
|
qn = self.connection.ops.quote_name
|
|
|
|
# Create the test database and connect to it.
|
|
cursor = self.connection.cursor()
|
|
try:
|
|
cursor.execute(
|
|
"CREATE DATABASE %s %s" % (qn(test_database_name), suffix))
|
|
except Exception as e:
|
|
sys.stderr.write(
|
|
"Got an error creating the test database: %s\n" % e)
|
|
if not autoclobber:
|
|
confirm = input(
|
|
"Type 'yes' if you would like to try deleting the test "
|
|
"database '%s', or 'no' to cancel: " % test_database_name)
|
|
if autoclobber or confirm == 'yes':
|
|
try:
|
|
if verbosity >= 1:
|
|
print("Destroying old test database '%s'..."
|
|
% self.connection.alias)
|
|
cursor.execute(
|
|
"DROP DATABASE %s" % qn(test_database_name))
|
|
cursor.execute(
|
|
"CREATE DATABASE %s %s" % (qn(test_database_name),
|
|
suffix))
|
|
except Exception as e:
|
|
sys.stderr.write(
|
|
"Got an error recreating the test database: %s\n" % e)
|
|
sys.exit(2)
|
|
else:
|
|
print("Tests cancelled.")
|
|
sys.exit(1)
|
|
|
|
return test_database_name
|
|
|
|
def destroy_test_db(self, old_database_name, verbosity=1):
|
|
"""
|
|
Destroy a test database, prompting the user for confirmation if the
|
|
database already exists.
|
|
"""
|
|
self.connection.close()
|
|
test_database_name = self.connection.settings_dict['NAME']
|
|
if verbosity >= 1:
|
|
test_db_repr = ''
|
|
if verbosity >= 2:
|
|
test_db_repr = " ('%s')" % test_database_name
|
|
print("Destroying test database for alias '%s'%s..." % (
|
|
self.connection.alias, test_db_repr))
|
|
|
|
# Temporarily use a new connection and a copy of the settings dict.
|
|
# This prevents the production database from being exposed to potential
|
|
# child threads while (or after) the test database is destroyed.
|
|
# Refs #10868 and #17786.
|
|
settings_dict = self.connection.settings_dict.copy()
|
|
settings_dict['NAME'] = old_database_name
|
|
backend = load_backend(settings_dict['ENGINE'])
|
|
new_connection = backend.DatabaseWrapper(
|
|
settings_dict,
|
|
alias='__destroy_test_db__',
|
|
allow_thread_sharing=False)
|
|
new_connection.creation._destroy_test_db(test_database_name, verbosity)
|
|
|
|
def _destroy_test_db(self, test_database_name, verbosity):
|
|
"""
|
|
Internal implementation - remove the test db tables.
|
|
"""
|
|
# Remove the test database to clean up after
|
|
# ourselves. Connect to the previous database (not the test database)
|
|
# to do so, because it's not allowed to delete a database while being
|
|
# connected to it.
|
|
cursor = self.connection.cursor()
|
|
# Wait to avoid "database is being accessed by other users" errors.
|
|
time.sleep(1)
|
|
cursor.execute("DROP DATABASE %s"
|
|
% self.connection.ops.quote_name(test_database_name))
|
|
self.connection.close()
|
|
|
|
def set_autocommit(self):
|
|
"""
|
|
Make sure a connection is in autocommit mode. - Deprecated, not used
|
|
anymore by Django code. Kept for compatibility with user code that
|
|
might use it.
|
|
"""
|
|
warnings.warn(
|
|
"set_autocommit was moved from BaseDatabaseCreation to "
|
|
"BaseDatabaseWrapper.", DeprecationWarning, stacklevel=2)
|
|
return self.connection.set_autocommit(True)
|
|
|
|
def sql_table_creation_suffix(self):
|
|
"""
|
|
SQL to append to the end of the test table creation statements.
|
|
"""
|
|
return ''
|
|
|
|
def test_db_signature(self):
|
|
"""
|
|
Returns a tuple with elements of self.connection.settings_dict (a
|
|
DATABASES setting value) that uniquely identify a database
|
|
accordingly to the RDBMS particularities.
|
|
"""
|
|
settings_dict = self.connection.settings_dict
|
|
return (
|
|
settings_dict['HOST'],
|
|
settings_dict['PORT'],
|
|
settings_dict['ENGINE'],
|
|
settings_dict['NAME']
|
|
)
|