lx-admin-backend/ruoyi-system/src/main/resources/mapper/system/SysRoleDeptMapper.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.ruoyi.system.mapper.SysRoleDeptMapper">

    <resultMap type="SysRoleDept" id="SysRoleDeptResult">
        <result property="roleId" column="role_id"/>
        <result property="deptId" column="dept_id"/>
    </resultMap>

    <insert id="batchRoleDept">
        insert into sys_role_dept(role_id, dept_id) values
        <foreach item="item" index="index" collection="list" separator=",">
            (#{item.roleId},#{item.deptId})
        </foreach>
    </insert>

</mapper>