OperationSystem/src/main/resources/mapper/RoleMenuMapper.xml

<?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.om.mapper.RoleMenuMapper">

    <delete id="deleteByRoleId">
        delete
        from sys_role_menu
        where role_id = #{roleId}
    </delete>
    <select id="selectByRoleId" resultType="java.lang.Integer">
        select menu_id
        from sys_role_menu
        where role_id = #{roleId}
    </select>
</mapper>