RuoYi-Vue-Plus/ruoyi-system/src/main/resources/mapper/system/SysUserPostMapper.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.SysUserPostMapper">

    <resultMap type="SysUserPost" id="SysUserPostResult">
        <result property="userId" column="user_id"/>
        <result property="postId" column="post_id"/>
    </resultMap>

    <insert id="batchUserPost">
        insert all
            <foreach item="item" index="index" collection="list" >
                into
                    sys_user_post(user_id, post_id)
                values
                (
                    #{item.userId},
                    #{item.postId}
                )
            </foreach>
        SELECT 1 FROM DUAL
    </insert>

</mapper>