jdbc合集--oracle+mysql+mariadb
jdbc连接Oracle数据库
https://blog.csdn.net/frdevolcqzyxynjds/article/details/104722087
jdbc连接MySQL数据库
https://blog.csdn.net/frdevolcqzyxynjds/article/details/104719983
jdbc连接MariaDB数据库
https://blog.csdn.net/frdevolcqzyxynjds/article/details/104717534