wangqi 5bf7fd676d Adding driver to mysql connection URL
With current URL [1], default driver will be used.
In order to ensure the compatibility, it is better to include the exact driver [2].

[1] connection = mysql://
[2] connection = mysql+pymysql://

Change-Id: I0a849e4f41f027de806f0969fc03ce4a2dcc8ffa
2018-03-20 09:36:09 +00:00
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