异常

1.   Check syntax #{property|(expression), var1=value1, var2=value2, ...}

记录我的低级错误，，，特地写一下，，，#{username),应该是大括号的，写成了小括号，，，还不易察觉。。。。

2. It's likely that neither a Result Type nor a Result Map was specified.

因为mapper.xml里修改resultType