更新mysql驅動5.1-47後出現錯誤：Generated keys not requested. You need to specify Statement.RETURN_GENERATED_KEY

java.sql.SQLException: Generated keys not requested. You need to specify Statement.RETURN_GENERATED_KEYS to Statement.executeUpdate(), Statement.executeLargeUpdate() or Connection.prepareStatement().

經過檢查發現從5.1.7版本之後的mysql-connector增加了返回GeneratedKeys的條件，如果需要返回GeneratedKeys，則PreparedStatement需要顯式新增一個引數Statement.RETURN_GENERATED_KEYS，如下：

connection = JDBCUtil.getConnection();
preparedStatement = connection.prepareStatement(sql.toString(),Statement.RETURN_GENERATED_KEYS);