https://dev.mysql.com/doc/refman/5.7/en/charset-binary-set.html
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-sets.html
https://dev.mysql.com/doc/refman/5.7/en/charset-unicode-sets.html
Converts from mysql charset to java charset.
Default Java Charset used by this client, UTF-8.