--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/annot-server/database.py	Tue Oct 14 05:07:37 2014 +0200
@@ -0,0 +1,54 @@
+#
+# See LICENCE for detail
+# Copyright (c) 2014 IRI
+#
+
+from sqlalchemy import create_engine, MetaData
+from sqlalchemy.orm import scoped_session, sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+
+import psycopg2.extras
+
+from twisted.python import log
+
+from txpostgres.txpostgres import Connection, ConnectionPool
+
+import config
+
+
+engine = create_engine(config.CONN_STR, convert_unicode=True)
+db_session = scoped_session(sessionmaker(autocommit=False,
+                                         autoflush=False,
+                                         bind=engine))
+
+Base = declarative_base()
+Base.query = db_session.query_property()
+
+def init_db():
+    # import all modules here that might define models so that
+    # they will be registered properly on the metadata.  Otherwise
+    # you will have to import them first before calling init_db()
+    import models
+    Base.metadata.create_all(bind=engine)
+
+
+class DictConnection(Connection):
+
+    @staticmethod
+    def connectionFactory(*args, **kwargs):
+        kwargs['connection_factory'] = psycopg2.extras.DictConnection
+        return psycopg2.connect(*args, **kwargs)
+
+
+class DictConnectionPool(ConnectionPool):
+    connectionFactory = DictConnection
+
+
+def create_connection_pool(conn_string):
+
+    created_connection_pool = DictConnectionPool(None, conn_string)
+
+    d = created_connection_pool.start()
+    d.addErrback(log.err)
+
+    return created_connection_pool, d