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import datetime
import psycopg2
from psycopg2.extras import DictCursor
from psycopg2 import IntegrityError
from psycopg2.extensions import register_adapter
from sqlalchemy import create_engine
import numpy as np
class InfDateAdapter:
def __init__(self, wrapped):
self.wrapped = wrapped
def getquoted(self):
if self.wrapped == datetime.date.max:
return b"'infinity'::date"
elif self.wrapped == datetime.date.min:
return b"'-infinity'::date"
else:
return psycopg2.extensions.DateFromPy(self.wrapped).getquoted()
register_adapter(datetime.date, InfDateAdapter)
def dbconn(dbname):
if dbname == 'etdb':
dbname = 'ET'
user_name = 'et_user'
else:
user_name = dbname[:-2] + '_user'
return psycopg2.connect(database=dbname,
user=user_name,
host="debian",
cursor_factory=DictCursor)
def nan_to_null(f, _NULL=psycopg2.extensions.AsIs('NULL'),
_Float=psycopg2.extensions.Float):
if not np.isnan(f):
return _Float(f)
return _NULL
def dbengine(dbname):
uri = "postgresql://{0}@debian/{1}".format(dbname[:-2] + '_user',
dbname)
return create_engine(uri)
def with_connection(dbname):
def decorator(f):
conn = dbconn(dbname)
def with_connection_(*args, **kwargs):
# or use a pool, or a factory function...
try:
rv = f(conn, *args, **kwargs)
except Exception as e:
print(e)
conn.rollback()
else:
return rv
return with_connection_
return decorator
def query_db(conn, sqlstr, params=None, one=True):
with conn.cursor() as c:
if params:
c.execute(sqlstr, params)
else:
c.execute(sqlstr)
conn.commit()
r = c.fetchone() if one else c.fetchall()
return r
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