Initial Fork from https://bitbucket.org/raphaelmutschler/calibreserver/

lib/sqlalchemy/dialects/mysql/pymysql.py

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+# mysql/pymysql.py
+# Copyright (C) 2005-2013 the SQLAlchemy authors and contributors <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: http://www.opensource.org/licenses/mit-license.php
+
+"""
+
+.. dialect:: mysql+pymysql
+    :name: PyMySQL
+    :dbapi: pymysql
+    :connectstring: mysql+pymysql://<username>:<password>@<host>/<dbname>[?<options>]
+    :url: http://code.google.com/p/pymysql/
+
+MySQL-Python Compatibility
+--------------------------
+
+The pymysql DBAPI is a pure Python port of the MySQL-python (MySQLdb) driver,
+and targets 100% compatibility.   Most behavioral notes for MySQL-python apply to
+the pymysql driver as well.
+
+"""
+
+from .mysqldb import MySQLDialect_mysqldb
+from ...util import py3k
+
+class MySQLDialect_pymysql(MySQLDialect_mysqldb):
+    driver = 'pymysql'
+
+    description_encoding = None
+    if py3k:
+        supports_unicode_statements = True
+
+    @classmethod
+    def dbapi(cls):
+        return __import__('pymysql')
+
+    if py3k:
+        def _extract_error_code(self, exception):
+            if isinstance(exception.args[0], Exception):
+                exception = exception.args[0]
+            return exception.args[0]
+
+dialect = MySQLDialect_pymysql