reset autoCommit after unknown issue occurs #66
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If an unknown exception other than a network exception occurs when executing setAutoCommit SQL, the autoCommit value of server session should be reset to the previous value.
Otherwise, the connection was picked by other threads, and the autoCommit value of server session is not equals to the value of autoCommit from DB, which cause the transaction enter to a wrong status after doBegin: The app server is autoCommit = false, and the DB server id autoCommit = true. In this case, the DB wouldn't exec SQLs in the method as a transaction.