Can't call rollb ack when autocommit=true
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com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException: Can’t call rollback when autocommit=true
数据库事务没有理解清楚
1. 当开启autocommit=true时，回滚没有意义，无论成功/失败都已经已经将事务提交
2. 只有autocommit=false，成功时手动调用conn.commit(), 失败也是手动调用conn.rollback();
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