1、Idea 如何新建XML文件
通过右键→file，通过写全后缀名添加创建
2、Mybatis配置工作原理
3、在做一个mybatis的demo的时候出现错误
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.ibatis.reflection.Reflector (file:/D:/application/resp/org/mybatis/mybatis/3.4.6/mybatis-3.4.6.jar) to method java.lang.Class.checkPackageAccess(java.lang.SecurityManager,java.lang.ClassLoader,boolean)
WARNING: Please consider reporting this to the maintainers of org.apache.ibatis.reflection.Reflector
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
原因：JDK版本为8以上会出现警告，不影响使用
小tips：
Ctrl＋Alt＋V 可以引入变量。例如把括号内的SQL赋成一个变量
快速添加行和列
Table>tr[*n]>th[*n] 然后输入tab创建成功