mybatis中mapUnderscoreToCamelCase的使用

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-////DTD Config 3.0//EN"
"/dtd/">
<configuration>
	<settings>
		<setting name="mapUnderscoreToCamelCase" value="true" />
	</settings>
</configuration>

开始以为配置了这个文件就可以了，搞了半天还是没生效，不能转驼峰，然后查了下configuration初始化时它的值也为true，说明初始化是正确，后来才知道原因出在mapper文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-////DTD Mapper 3.0//EN"
"/dtd/">
<mapper namespace="">
	<select  resultType="">
		select MENU_ID, MENU_NAME, PARENT_ID, URL, TITLE, LEAF, ORDER_SEQ
		  from 
		  order by ORDER_SEQ
	</select>
</mapper>

开始我配置成resultType="hashMap"是可以返回结果，但是结果是没有自动转成驼峰，要真正存在一个与它对应的驼峰Bean与它对应才生效，resultType=""