target/classes/mapper/PromotionMapper.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.example.myproject.mapper.PromotionMapper">

    <insert id="insert" parameterType="com.example.myproject.entity.Promotion">
        INSERT INTO promotion (
        name, description, start_time, end_time, discount_percentage, applicable_torrent_ids
        ) VALUES (
        #{name}, #{description}, #{startTime}, #{endTime}, #{discountPercentage}, #{applicableTorrentIds}
        )
    </insert>

</mapper>