mybatis xml文件实现一对多关系 collection嵌套 sql简单五表联查

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.mappers.UserMapper">
	<!-- 自定义结果类型 -->
	<resultMap type="com.entity.User" id="userMap">
		<id property="userid" column="userid"/>
		<result property="nickname" column="nickname"/>
		<result property="password" column="password"/>
		<result property="realname" column="realname"/>
	</resultMap>
	<resultMap type="com.entity.User" id="allMap">
		<id property="userid" column="userid"/>
		<