refactor: 目录结构调整和代码优化

src/main/resources/mapper/RoleMapper.xml

@@ -0,0 +1,27 @@
+<?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.youlai.boot.system.mapper.RoleMapper">
+
+    <!-- 获取最大范围的数据权限 -->
+    <select id="getMaximumDataScope" resultType="java.lang.Integer">
+        SELECT
+            min(data_scope)
+        FROM
+            sys_role
+        <where>
+            <choose>
+                <when test="roles!=null and roles.size>0">
+                    AND code IN
+                    <foreach collection="roles" item="role" separator="," open="(" close=")">
+                        #{role}
+                    </foreach>
+                </when>
+                <otherwise>
+                    id = -1
+                </otherwise>
+            </choose>
+        </where>
+    </select>
+</mapper>