参考：
https://blog.csdn.net/gebitan505/article/details/54929287/https://blog.csdn.net/KingBoyWorld/article/details/78948304https://blog.csdn.net/lisulong1/article/details/40985589
mybatis注解中写SQL语句
原文：https://www.cnblogs.com/lvlin241/p/9313289.html
