PgDB: fix connect() return and improve logging

mylib/pgsql.py

@@ -36,14 +36,19 @@ class PgDB:
         if self.con == 0:
             try:
                 con = psycopg2.connect(
-                    "dbname='%s' user='%s' host='%s' password='%s'" % (
-                        self.db, self.user, self.host, self.pwd
-                    )
+                    dbname=self.db,
+                    user=self.user,
+                    host=self.host,
+                    password=self.pwd
                 )
                 self.con = con
             except Exception:
-                log.fatal('An error occured during Postgresql database connection.', exc_info=1)
+                logging.fatal(
+                    'An error occured during Postgresql database connection (%s@%s, database=%s).',
+                    self.user, self.host, self.db, exc_info=1
+                )
                 sys.exit(1)
+        return True
 
     def close(self):
         """ Close connection with PostgreSQL server (if opened) """