数据库连接池 & Mybatis-Plus使用遇到的问题 & Spring事务
druid数据库连接池:
https://stackoverflow.com/questions/41566361/spring-boot-1-4-2-data-source-configuration
https://blog.nowcoder.net/n/dc2af81950104390969ab73c3c6f3934
https://cloud.tencent.com/developer/article/1733125
https://xyzghio.xyz/DruidBySpringBoot/
Mybatis-Plus 使用updateById()、update()将字段更新为null
https://www.bloghome.com.cn/post/mybatis-plus-shi-yong-updatebyid-update-jiang-zi-duan-geng-xin-wei-null.html
https://www.cnblogs.com/r1-12king/p/15834915.html
https://justsme.github.io/2021/02/14/mybatis-plus-4-mapper-crud-zhi-geng-xin/#!
使用Mybatis-plus策略自动更新数据库时间失败问题解决
https://www.jianshu.com/p/dbd4c464cb6c
`gmt_modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间'
update语句,影响行数为0,不会更新修改时间
Spring事务
https://z.itpub.net/article/detail/18A4D9564A61EC7AF8EAA66FCA251444