mybatis collection 多个列

https://www.cnblogs.com/lyh233/p/12350505.html

<collection property="students"
            select="com.pxxy.bean.StudentMapper.getStusByColId"
            column="id" fetchType="lazy">
            <!-- 多列值传递时:将多列的值封装成map进行传递
                column="{key1=column1,key2=column2}"
                key为sql语句中中#{}的里值，column为将哪个列的值赋给key
                举例：column={"cid=id,cname=collegeName"}
                    则在另一个查询语句中取值为#{cid}和#{cname}
               
                fetchType="lazy"表示使用延迟加载；
                        值为eager时则为立即加载，即使全局配置文件中配置了延迟加载 
                     -->
        </collection>