https://blog.csdn.net/u011983531/article/details/53561219
mybatis中if判断传入字符串或者Long参数不为空
https://blog.csdn.net/lihua5419/article/details/79971759
mybatis if test非空判断数字0为什么是false
http://blog.51cto.com/wangguangshuo/1944531
https://blog.csdn.net/u011983531/article/details/53561219
https://blog.csdn.net/lihua5419/article/details/79971759
http://blog.51cto.com/wangguangshuo/1944531