<?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.pz.system.mapper.SysUserRoleMapper"> <resultMap type="SysUserRole" id="SysUserRoleResult"> <result property="userId" column="user_id"/> <result property="roleId" column="role_id"/> </resultMap> <select id="selectUserIdsByRoleId" resultType="Long"> select u.user_id from sys_user u inner join sys_user_role sur on u.user_id = sur.user_id and sur.role_id = #{roleId} </select> </mapper>