Add support for query parameters in DB connection URL

 - Make the schema be called “driver” in config

Author: ndenny

example_config.ini

@@ -6,7 +6,7 @@ debug = True
 secret = a super secretive string
 
 [database]
-engine = postgresql
+driver = postgresql
 username = grice
 password = grice
 host = localhost

grice/db_service.py

@@ -1,12 +1,14 @@
 from collections import namedtuple
+import urllib
 
-from sqlalchemy.sql import Select
-
-from grice.errors import ConfigurationError, NotFoundError, JoinError
 from sqlalchemy import create_engine, MetaData, Column, Table, select, not_, or_, asc, desc, and_
 from sqlalchemy import engine
+from sqlalchemy.sql import Select
 from sqlalchemy.engine import reflection
 
+from grice.errors import ConfigurationError, NotFoundError, JoinError
+
+
 DEFAULT_PAGE = 0
 DEFAULT_PER_PAGE = 50
 LIST_FILTERS = ['in', 'not_in', 'bt', 'nbt']
@@ -24,6 +26,7 @@ def init_database(db_config):
     :param db_config:
     :return: SqlAlchemy engine object.
     """
+    driver = db_config.get('driver', 'postgresql')
     try:
         db_args = {
             'username': db_config['username'],
@@ -32,11 +35,13 @@ def init_database(db_config):
             'port': db_config['port'],
             'database': db_config['database']
         }
+        if 'query' in db_config:
+            db_args['query'] = dict(urllib.parse.parse_qsl(db_config['query'], keep_blank_values=True))
     except KeyError:
         msg = '"username", "password", "host", "port", and "database" are required fields of database config'
         raise ConfigurationError(msg)
 
-    eng_url = engine.url.URL(db_config.get('engine', 'postgresql'), **db_args)
+    eng_url = engine.url.URL(driver, **db_args)
 
     return create_engine(eng_url)