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WIP: Check if table already exists before creating it #158

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WIP: Check if table already exists before creating it #158

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065b37a
Check if table already exists before recreating it
lopuhin Jun 16, 2016
e45b4f3
Drop with checkfirst=True instead of manual check
lopuhin Jun 20, 2016
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19 changes: 6 additions & 13 deletions frontera/contrib/backends/sqlalchemy/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.engine.reflection import Inspector

from frontera.core.components import DistributedBackend
from frontera.contrib.backends import CommonBackend
Expand Down Expand Up @@ -127,12 +126,10 @@ def strategy_worker(cls, manager):
drop_all_tables = settings.get('SQLALCHEMYBACKEND_DROP_ALL_TABLES')
clear_content = settings.get('SQLALCHEMYBACKEND_CLEAR_CONTENT')
model = b.models['StateModel']
inspector = Inspector.from_engine(b.engine)

if drop_all_tables:
if model.__table__.name in inspector.get_table_names():
model.__table__.drop(bind=b.engine)
model.__table__.create(bind=b.engine)
model.__table__.drop(bind=b.engine, checkfirst=True)
model.__table__.create(bind=b.engine, checkfirst=True)
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This is happening because SQLA has non-unified behavior between various engines. For example that code works well for sqlite, without need of checkfirst=True. However, I still think it makes sense to merge it.


if clear_content:
session = b.session_cls()
Expand All @@ -148,18 +145,14 @@ def db_worker(cls, manager):
settings = manager.settings
drop = settings.get('SQLALCHEMYBACKEND_DROP_ALL_TABLES')
clear_content = settings.get('SQLALCHEMYBACKEND_CLEAR_CONTENT')
inspector = Inspector.from_engine(b.engine)

metadata_m = b.models['MetadataModel']
queue_m = b.models['QueueModel']
if drop:
existing = inspector.get_table_names()
if metadata_m.__table__.name in existing:
metadata_m.__table__.drop(bind=b.engine)
if queue_m.__table__.name in existing:
queue_m.__table__.drop(bind=b.engine)
metadata_m.__table__.create(bind=b.engine)
queue_m.__table__.create(bind=b.engine)
metadata_m.__table__.drop(bind=b.engine, checkfirst=True)
queue_m.__table__.drop(bind=b.engine, checkfirst=True)
metadata_m.__table__.create(bind=b.engine, checkfirst=True)
queue_m.__table__.create(bind=b.engine, checkfirst=True)

if clear_content:
session = b.session_cls()
Expand Down