Add get role controller. Optimize code.

src/main/resources/mapper/permission/GroupMapper.xml

@@ -1,5 +1,15 @@
 <?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="top.fatweb.api.mapper.permission.GroupMapper">
+    <select id="selectPage">
 
+    </select>
+
+    <resultMap id="groupMap" type="group">
+        <id property="id" column="group_id"/>
+        <result property="name" column="group_name"/>
+        <result property="enable" column="group_enable"/>
+        <result property="deleted" column="group_deleted"/>
+        <result property="version" column="group_version"/>
+    </resultMap>
 </mapper>