def open_db(self, engine, mode='open'):
"mode: create, open, drop"
from sqlalchemy.ext.declarative import declarative_base, DeferredReflection
from sqlalchemy.schema import MetaData, DropConstraint
from sqlalchemy import event, Table
if mode != 'open':
# Clear out any existing tables
metadata = MetaData(engine)
metadata.reflect()
if engine.name != 'sqlite':
for table in metadata.tables.values():
for fk in table.foreign_keys:
engine.execute(DropConstraint(fk.constraint))
metadata.drop_all(engine)
if mode == 'drop': return
self.Base = declarative_base(cls=DeferredReflection)
self.Base.metadata.bind = engine
if mode == 'open':
@event.listens_for(Table, "column_reflect")
def column_reflect(inspector, table, column_info):
if table.metadata is self.Base.metadata:
if self.column_map and table.name in self.column_map:
column_info['key'] = self.column_map[table.name][
column_info['name']]
else:
column_info['key'] = column_info['name']
self.declare(reflect=mode == 'open')
if mode == 'create': self.Base.metadata.create_all(engine)
from sqlalchemy.orm import sessionmaker
self.Base.prepare(engine)
self.reflect_classes()
Session = sessionmaker(bind=engine)
self.session = Session()
def test_conditional_constraint_deprecated(self):
metadata, users, engine = self.metadata, self.users, self.engine
nonpg_mock = engines.mock_engine(dialect_name='sqlite')
pg_mock = engines.mock_engine(dialect_name='postgresql')
constraint = CheckConstraint('a < b', name='my_test_constraint'
, table=users)
# by placing the constraint in an Add/Drop construct, the
# 'inline_ddl' flag is set to False
AddConstraint(constraint, on='postgresql'
).execute_at('after-create', users)
DropConstraint(constraint, on='postgresql'
).execute_at('before-drop', users)
metadata.create_all(bind=nonpg_mock)
strings = ' '.join(str(x) for x in nonpg_mock.mock)
assert 'my_test_constraint' not in strings
metadata.drop_all(bind=nonpg_mock)
strings = ' '.join(str(x) for x in nonpg_mock.mock)
assert 'my_test_constraint' not in strings
metadata.create_all(bind=pg_mock)
strings = ' '.join(str(x) for x in pg_mock.mock)
assert 'my_test_constraint' in strings
metadata.drop_all(bind=pg_mock)
strings = ' '.join(str(x) for x in pg_mock.mock)
assert 'my_test_constraint' in strings
def _drop_foreign_key_constraints(instance, engine, table, columns):
"""Drop foreign key constraints for a table on specific columns."""
inspector = sqlalchemy.inspect(engine)
drops = []
for foreign_key in inspector.get_foreign_keys(table):
if (
foreign_key["name"]
and foreign_key.get("options", {}).get("ondelete")
and foreign_key["constrained_columns"] == columns
):
drops.append(ForeignKeyConstraint((), (), name=foreign_key["name"]))
# Bind the ForeignKeyConstraints to the table
old_table = Table( # noqa: F841 pylint: disable=unused-variable
table, MetaData(), *drops
)
for drop in drops:
with session_scope(session=instance.get_session()) as session:
try:
connection = session.connection()
connection.execute(DropConstraint(drop))
except (InternalError, OperationalError):
_LOGGER.exception(
"Could not drop foreign constraints in %s table on %s",
TABLE_STATES,
columns,
)
def drop_everything(engine):
"""Drop everything in database.
Source: https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/DropEverything
"""
conn = engine.connect()
# the transaction only applies if the DB supports
# transactional DDL, i.e. Postgresql, MS SQL Server
trans = conn.begin()
inspector = reflection.Inspector.from_engine(engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def _drop_all_(self, session):
logging.warn("dropping schema")
inspector = reflection.Inspector.from_engine(session.bind)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
session.execute(DropConstraint(fkc))
for table in tbs:
session.execute(DropTable(table))
session.commit()
def drop_db():
if db_engine is None:
raise Exception
conn = db_engine.connect()
trans = conn.begin()
inspector = engine.reflection.Inspector.from_engine(db_engine)
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def upgrade_resource_data_pre(migrate_engine):
meta = sqlalchemy.MetaData(bind=migrate_engine)
rd_table = sqlalchemy.Table('resource_data', meta, autoload=True)
res_table = sqlalchemy.Table('resource', meta, autoload=True)
# remove foreignkey on resource_id
inspector = sqlalchemy.inspect(migrate_engine)
fkc_query = inspector.get_foreign_keys('resource_data')
if fkc_query:
fkc = ForeignKeyConstraint([rd_table.c.resource_id], [res_table.c.id],
fkc_query[0]['name'])
migrate_engine.execute(DropConstraint(fkc))
# migrate.ForeignKeyConstraint(columns=[rd_table.c.resource_id],
# refcolumns=[res_table.c.id]).drop()
# rename resource_id -> tmp_res_uuid
rd_table.c.resource_id.alter('tmp_res_uuid', sqlalchemy.String(36))
# create the new resource_id column (no foreignkey yet)
res_id_column_kwargs = {}
if migrate_engine.name == 'ibm_db_sa':
# NOTE(mriedem): This is turned into a foreignkey key constraint
# later so it must be non-nullable.
res_id_column_kwargs['nullable'] = False
res_id = sqlalchemy.Column('resource_id', sqlalchemy.Integer,
**res_id_column_kwargs)
rd_table.create_column(res_id)
def drop_everything(db):
# From: http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DropEverything
conn = db.engine.connect()
trans = conn.begin()
inspector = reflection.Inspector.from_engine(db.engine)
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = db.Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def rebuild_db():
# See this SQLAlchemy recipe: http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DropEverything
inspector = reflection.Inspector.from_engine(db.engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
db.engine.execute(DropConstraint(fkc))
for table in tbs:
db.engine.execute(DropTable(table))
db.session.commit()
db.create_all()
def tearDown(self):
db.session.remove()
# Replacement for db.session.drop_all()
# http://www.mbeckler.org/blog/?p=218
engine = db.get_engine(self.app)
conn = engine.connect()
trans = conn.begin()
inspector = reflection.Inspector.from_engine(engine)
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(
ForeignKeyConstraint((), (), name=fk['name'])
)
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
engine.dispose()
def clone_table_approach_1(original_table, connection, metadata):
try:
new_table_name = original_table.name + '_sync'
columns = [c.copy() for c in original_table.columns]
new_table = Table(new_table_name, metadata, quote=False, *columns)
# Create table in database
if not new_table.exists():
new_table.create()
else:
raise Exception("New table already exists")
# Remove constraints from new table if any
for constraint in new_table.constraints:
connection.execute(DropConstraint(constraint))
# Return table handle for newly created table
final_cloned_table = Table(new_table, metadata, quote=False)
return final_cloned_table
except:
# Drop if we did create a new table
if new_table.exists():
new_table.drop()
raise
def drop_db(db):
inspector = reflection.Inspector.from_engine(db.engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
db.engine.execute(DropConstraint(fkc))
for table in tbs:
db.engine.execute(DropTable(table))
def db_DropEverything():
_engine = get_engine()
conn = _engine.connect()
# the transaction only applies if the DB supports
# transactional DDL, i.e. Postgresql, MS SQL Server
trans = conn.begin()
inspector = reflection.Inspector.from_engine(_engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk["name"]:
continue
fks.append(ForeignKeyConstraint((), (), name=fk["name"]))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def test_conditional_constraint(self):
metadata, users, engine = self.metadata, self.users, self.engine
nonpg_mock = engines.mock_engine(dialect_name="sqlite")
pg_mock = engines.mock_engine(dialect_name="postgresql")
constraint = CheckConstraint("a < b",
name="my_test_constraint",
table=users)
# by placing the constraint in an Add/Drop construct, the
# 'inline_ddl' flag is set to False
event.listen(
users,
"after_create",
AddConstraint(constraint).execute_if(dialect="postgresql"),
)
event.listen(
users,
"before_drop",
DropConstraint(constraint).execute_if(dialect="postgresql"),
)
metadata.create_all(bind=nonpg_mock)
strings = " ".join(str(x) for x in nonpg_mock.mock)
assert "my_test_constraint" not in strings
metadata.drop_all(bind=nonpg_mock)
strings = " ".join(str(x) for x in nonpg_mock.mock)
assert "my_test_constraint" not in strings
metadata.create_all(bind=pg_mock)
strings = " ".join(str(x) for x in pg_mock.mock)
assert "my_test_constraint" in strings
metadata.drop_all(bind=pg_mock)
strings = " ".join(str(x) for x in pg_mock.mock)
assert "my_test_constraint" in strings
def drop_db():
"""It is a workaround for dropping all tables in sqlalchemy.
"""
if db_engine is None:
raise Exception
conn = db_engine.connect()
trans = conn.begin()
inspector = engine.reflection.Inspector.from_engine(db_engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def reset_db():
# https://github.com/pallets/flask-sqlalchemy/issues/722 reference from bryan5989
con = db.engine.connect()
trans = con.begin()
inspector = Inspector.from_engine(db.engine)
'''
We need to re-create a minimal metadata with only the required things to
successfully emit drop constraints and tables commands for postgres (based
on the actual schema of the running instance)
'''
meta = MetaData()
tables = []
all_fkeys = []
for table_name in inspector.get_table_names():
fkeys = []
for fkey in inspector.get_foreign_keys(table_name):
if not fkey["name"]:
continue
fkeys.append(db.ForeignKeyConstraint((), (), name=fkey["name"]))
tables.append(Table(table_name, meta, *fkeys))
all_fkeys.extend(fkeys)
# drop all the constraint in the data before dropping the table
for fkey in all_fkeys:
con.execute(DropConstraint(fkey))
for table in tables:
con.execute(DropTable(table))
trans.commit()
def _update_states_table_with_foreign_key_options(engine):
"""Add the options to foreign key constraints."""
inspector = reflection.Inspector.from_engine(engine)
alters = []
for foreign_key in inspector.get_foreign_keys(TABLE_STATES):
if foreign_key["name"] and not foreign_key["options"]:
alters.append({
"old_fk":
ForeignKeyConstraint((), (), name=foreign_key["name"]),
"columns":
foreign_key["constrained_columns"],
})
if not alters:
return
states_key_constraints = Base.metadata.tables[
TABLE_STATES].foreign_key_constraints
old_states_table = Table( # noqa: F841 pylint: disable=unused-variable
TABLE_STATES, MetaData(), *[alter["old_fk"] for alter in alters])
for alter in alters:
try:
engine.execute(DropConstraint(alter["old_fk"]))
for fkc in states_key_constraints:
if fkc.column_keys == alter["columns"]:
engine.execute(AddConstraint(fkc))
except (InternalError, OperationalError):
_LOGGER.exception("Could not update foreign options in %s table",
TABLE_STATES)
def test_conditional_constraint_deprecated(self):
metadata, users = self.metadata, self.users
nonpg_mock = engines.mock_engine(dialect_name="sqlite")
pg_mock = engines.mock_engine(dialect_name="postgresql")
constraint = CheckConstraint("a < b",
name="my_test_constraint",
table=users)
# by placing the constraint in an Add/Drop construct, the
# 'inline_ddl' flag is set to False
AddConstraint(constraint,
on="postgresql").execute_at("after-create", users)
DropConstraint(constraint,
on="postgresql").execute_at("before-drop", users)
metadata.create_all(bind=nonpg_mock)
strings = " ".join(str(x) for x in nonpg_mock.mock)
assert "my_test_constraint" not in strings
metadata.drop_all(bind=nonpg_mock)
strings = " ".join(str(x) for x in nonpg_mock.mock)
assert "my_test_constraint" not in strings
metadata.create_all(bind=pg_mock)
strings = " ".join(str(x) for x in pg_mock.mock)
assert "my_test_constraint" in strings
metadata.drop_all(bind=pg_mock)
strings = " ".join(str(x) for x in pg_mock.mock)
assert "my_test_constraint" in strings
def remove_foreign_keys(self, engine):
inspector = reflection.Inspector.from_engine(engine)
fake_metadata = MetaData()
table = 'fact_wbulb_freez_alt'
fake_tables = []
all_fks = []
for table_name in Base.metadata.tables:
if table_name == table:
fks = []
for fk in inspector.get_foreign_keys(table_name):
if fk['name']:
fks.append(
ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, fake_metadata, *fks)
fake_tables.append(t)
all_fks.extend(fks)
connection = engine.connect()
transaction = connection.begin()
for fkc in all_fks:
print(fkc)
connection.execute(DropConstraint(fkc))
transaction.commit()
def drop_all_table():
from sqlalchemy.engine import reflection
from sqlalchemy.schema import MetaData, Table, DropTable, ForeignKeyConstraint, DropConstraint
conn = db.engine.connect()
trans = conn.begin()
inspector = reflection.Inspector.from_engine(db.engine)
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def drop_everything():
"""Break all contraints and drop tables
Credit to Michael Bayer
https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/DropEverything
"""
engine = create_engine(POSTGRES_URI)
conn = engine.connect()
trans = conn.begin()
inspector = reflection.Inspector.from_engine(engine)
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
conn.execute(DropConstraint(fkc))
for table in tbs:
conn.execute(DropTable(table))
trans.commit()
def drop_tables(engine):
"""
Drop all the tables in the database attached to by the supplied
engine.
As many foreign key constraints as possible will be dropped
first making this quite brutal!
"""
# from http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DropEverything
conn = engine.connect()
inspector = Inspector.from_engine(engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(
ForeignKeyConstraint((),(),name=fk['name'])
)
t = Table(table_name, metadata,*fks)
tbs.append(t)
for fkc in fks:
conn.execute(DropConstraint(fkc, cascade=True))
for table in tbs:
conn.execute(DropTable(table))
def drop_tables(self):
'''DROP all tables except those for PostGIS.'''
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
log.debug('drop_tables')
metadata = MetaData()
tables = []
all_foreign_keys = []
for table_name in self.inspector.get_table_names():
foreign_keys = []
for foreign_key in self.inspector.get_foreign_keys(table_name):
if not foreign_key['name']:
continue
foreign_keys.append(
ForeignKeyConstraint((), (), name=foreign_key['name'])
)
table = Table(table_name, metadata, *foreign_keys)
tables.append(table)
all_foreign_keys.extend(foreign_keys)
for foreign_key in all_foreign_keys:
self.conn.execute(DropConstraint(foreign_key))
for table in tables:
# This table is part of PostGIS extension.
if table.name == 'spatial_ref_sys':
continue
self.conn.execute(DropTable(table))
self.trans.commit()
def drop_all_tables(engine, inspector, schema=None, include_names=None):
from sqlalchemy import Column, Table, Integer, MetaData, \
ForeignKeyConstraint
from sqlalchemy.schema import DropTable, DropConstraint
if include_names is not None:
include_names = set(include_names)
with engine.connect() as conn:
for tname, fkcs in reversed(
inspector.get_sorted_table_and_fkc_names(schema=schema)):
if tname:
if include_names is not None and tname not in include_names:
continue
conn.execute(DropTable(
Table(tname, MetaData(), schema=schema)
))
elif fkcs:
if not engine.dialect.supports_alter:
continue
for tname, fkc in fkcs:
if include_names is not None and \
tname not in include_names:
continue
tb = Table(
tname, MetaData(),
Column('x', Integer),
Column('y', Integer),
schema=schema
)
conn.execute(DropConstraint(
ForeignKeyConstraint(
[tb.c.x], [tb.c.y], name=fkc)
))
def _update_states_table_with_foreign_key_options(connection, engine):
"""Add the options to foreign key constraints."""
inspector = sqlalchemy.inspect(engine)
alters = []
for foreign_key in inspector.get_foreign_keys(TABLE_STATES):
if foreign_key["name"] and (
# MySQL/MariaDB will have empty options
not foreign_key.get("options") or
# Postgres will have ondelete set to None
foreign_key.get("options", {}).get("ondelete") is None):
alters.append({
"old_fk":
ForeignKeyConstraint((), (), name=foreign_key["name"]),
"columns":
foreign_key["constrained_columns"],
})
if not alters:
return
states_key_constraints = Base.metadata.tables[
TABLE_STATES].foreign_key_constraints
old_states_table = Table( # noqa: F841 pylint: disable=unused-variable
TABLE_STATES, MetaData(), *(alter["old_fk"] for alter in alters))
for alter in alters:
try:
connection.execute(DropConstraint(alter["old_fk"]))
for fkc in states_key_constraints:
if fkc.column_keys == alter["columns"]:
connection.execute(AddConstraint(fkc))
except (InternalError, OperationalError):
_LOGGER.exception("Could not update foreign options in %s table",
TABLE_STATES)
def setupPackage():
os.environ['MONGO_URI'] = 'mongodb://localhost'
os.environ['MONGO_DB_NAME'] = 'royal_example'
os.environ['MONGO_DB_PREFIX'] = ''
# sqla extentsion setup.
global engine
alembic_config = Config()
alembic_config.set_main_option('script_location', 'example/ext/sqla/db')
alembic_config.set_main_option('sqlalchemy.url', mysql_uri)
engine = create_engine(mysql_uri)
try:
command.downgrade(alembic_config, 'base')
except:
log.exception("Migration downgrade failed, clearing all tables")
metadata = MetaData(engine)
metadata.reflect()
for table in metadata.tables.values():
for fk in table.foreign_keys:
engine.execute(DropConstraint(fk.constraint))
metadata.drop_all()
command.upgrade(alembic_config, 'head')
def db(app, request):
"""
Returns session-wide initialised database.
Drops all existing tables - Meta follows Postgres FKs
"""
with app.app_context():
# Clear out any existing tables
metadata = MetaData(_db.engine)
metadata.reflect()
for table in metadata.tables.values():
for fk in table.foreign_keys:
_db.engine.execute(DropConstraint(fk.constraint))
metadata.drop_all()
_db.drop_all()
# ############################################
# There are 2 approaches, an empty database, or the same one that the app will use
# create the tables
# _db.create_all()
# or
# Use Alembic to load all of the DB revisions including supporting lookup data
# This is the path we'll use in NAMEX!!
# even though this isn't referenced directly, it sets up the internal configs that upgrade needs
migrate = Migrate(app, _db)
upgrade()
def db_drop_everything(self, engine):
""" From http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DropEverything """
try:
conn = engine.connect()
transactional = conn.begin()
inspector = reflection.Inspector.from_engine(engine)
metadata = MetaData()
tables = []
all_foreign_keys = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk["name"]:
continue
fks.append(ForeignKeyConstraint((), (), name=fk["name"]))
t = Table(table_name, metadata, *fks)
tables.append(t)
all_foreign_keys.extend(fks)
for foreignkey in all_foreign_keys:
conn.execute(DropConstraint(foreignkey))
for table in tables:
conn.execute(DropTable(table))
transactional.commit()
except Exception as err:
print(err)
return False
finally:
conn.close()
def destory_everything(echo=True):
""" Using metadata.reflect() to get all constraints and tables.
metadata.drop_all() as it handles cyclical constraints between tables.
Ref. http://www.sqlalchemy.org/trac/wiki/UsageRecipes/DropEverything
"""
engine = session.get_engine(echo=echo)
conn = engine.connect()
# the transaction only applies if the DB supports
# transactional DDL, i.e. Postgresql, MS SQL Server
trans = conn.begin()
inspector = reflection.Inspector.from_engine(engine)
# gather all data first before dropping anything.
# some DBs lock after things have been dropped in
# a transaction.
metadata = MetaData()
tbs = []
all_fks = []
for table_name in inspector.get_table_names():
fks = []
for fk in inspector.get_foreign_keys(table_name):
if not fk['name']:
continue
fks.append(ForeignKeyConstraint((), (), name=fk['name']))
t = Table(table_name, metadata, *fks)
tbs.append(t)
all_fks.extend(fks)
for fkc in all_fks:
try:
print(str(DropConstraint(fkc)) + ';')
conn.execute(DropConstraint(fkc))
except: # noqa: B901
print(traceback.format_exc())
for table in tbs:
try:
print(str(DropTable(table)).strip() + ';')
conn.execute(DropTable(table))
except: # noqa: B901
print(traceback.format_exc())
trans.commit()
def db(app): # pylint: disable=redefined-outer-name, invalid-name
"""Return a session-wide initialised database.
Drops all existing tables - Meta follows Postgres FKs
"""
with app.app_context():
# Clear out any existing tables
metadata = MetaData(_db.engine)
metadata.reflect()
for table in metadata.tables.values():
for fk in table.foreign_keys: # pylint: disable=invalid-name
_db.engine.execute(DropConstraint(fk.constraint))
metadata.drop_all()
_db.drop_all()
sequence_sql = """SELECT sequence_name FROM information_schema.sequences
WHERE sequence_schema='public'
"""
sess = _db.session()
for seq in [name for (name, ) in sess.execute(text(sequence_sql))]:
try:
sess.execute(text('DROP SEQUENCE public.%s ;' % seq))
print('DROP SEQUENCE public.%s ' % seq)
except Exception as err: # pylint: disable=broad-except
print(f'Error: {err}')
sess.commit()
# ############################################
# There are 2 approaches, an empty database, or the same one that the app will use
# create the tables
# _db.create_all()
# or
# Use Alembic to load all of the DB revisions including supporting lookup data
# This is the path we'll use in selfservice_api!!
# even though this isn't referenced directly,
# it sets up the internal configs that upgrade needs
Migrate(app, _db)
upgrade()
admin_user = {
'sub': '65a62428-6713-4e7d-8f12-99e56de58386',
'given_name': 'admin',
'family_name': 'ss',
'email': '*****@*****.**'
}
sess.execute(
text(
'INSERT INTO public."user"(' +
'created, modified, email, phone, first_name, last_name, oauth_id)'
+ "VALUES (now(), null, '" + admin_user['email'] + "', " +
"'123456789', '" + admin_user['given_name'] + "', " + " '" +
admin_user['family_name'] + "', '" + admin_user['sub'] +
"'); "))
sess.commit()
return _db
