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src/main/resources/mapper/admin/AdminUserMapper.xml

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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.gameplatform.server.mapper.admin.AdminUserMapper">
+    <resultMap id="AdminUserMap" type="com.gameplatform.server.model.entity.admin.AdminUser">
+        <id property="id" column="id" />
+        <result property="username" column="username" />
+        <result property="passwordHash" column="password_hash" />
+        <result property="role" column="role" />
+        <result property="status" column="status" />
+        <result property="createdAt" column="created_at" />
+        <result property="updatedAt" column="updated_at" />
+    </resultMap>
+
+    <select id="findByUsername" parameterType="string" resultMap="AdminUserMap">
+        SELECT id, username, password_hash, role, status, created_at, updated_at
+        FROM admin_user
+        WHERE username = #{username}
+        LIMIT 1
+    </select>
+</mapper>
+