http://shengwangi.blogspot.tw/2014/12/how-to-configure-primary-key-generator-in-jpa-for-oracle.html
https://springframework.guru/using-h2-and-oracle-with-spring-boot/
https://springframework.guru/configuring-spring-boot-for-oracle/
https://www.mkyong.com/spring-boot/spring-boot-spring-data-jpa-oracle-example/
