db.py
from __future__ import generator_stop
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session
from .psiturk_config import PsiturkConfig
import sys
config = PsiturkConfig()
config.load_config()
DATABASE = config.get('Database Parameters', 'database_url')
if 'mysql://' in DATABASE.lower():
try:
__import__('imp').find_module('pymysql')
except ImportError:
print("To use a MySQL database you need to install "
"the `pymysql` python package. Try `pip install "
"pymysql`.")
sys.exit()
# internally use `mysql+pymysql://` so sqlalchemy talks to
# the pymysql package
DATABASE = DATABASE.replace('mysql://', 'mysql+pymysql://')
engine = create_engine(DATABASE, echo=False, pool_recycle=3600)
db_session = scoped_session(sessionmaker(autocommit=False,
autoflush=False,
bind=engine))
def init_db():
from .models import Base
# print "Initializing db if necessary."
Base.metadata.create_all(bind=engine)
def truncate_tables():
from .models import Base
for table in Base.metadata.sorted_tables:
db_session.execute(table.delete(bind=engine))
db_session.commit()