Fix unexpected 'decode' AttributeError when MySQLdb module is mapped by PyMySQL (#336)
* Skip if MySQLdb module is mapped by PyMySQL
In some use cases, `pymysql.install_as_MySQLdb()` will be used to initialize a 'fake' MySQLdb module,
which is actually mapped to pymysql module.
Then the sw_mysqlclient plugin will change the data type of `connection.db` from bytes into str,
cause the `AttributeError: 'str' object has no attribute 'decode'` exception in sw_pymysql.py line 45,
which regard it as bytes.
2 files changed
