src/main/resources/mapper/TorrentMapper.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.g8backend.mapper.TorrentMapper">
    <insert id="insertTorrent" >
        INSERT INTO torrents (user_id, torrent_name, info_hash, file_size)
        VALUES (#{userId}, #{torrentName}, UNHEX(#{infoHash}), #{fileSize})
    </insert>

    <select id="getTorrentByInfoHash" resultType="com.example.g8backend.entity.Torrent">
        SELECT
            torrent_id,
            user_id,
            torrent_name,
            HEX(info_hash) AS infoHash,
            file_size
        FROM torrents
        WHERE info_hash = UNHEX(#{infoHash})
    </select>

    <select id="getTorrentByTorrentId" resultType="com.example.g8backend.entity.Torrent">
        SELECT
            torrent_id,
            user_id,
            torrent_name,
            HEX(info_hash) AS infoHash,
            file_size
        FROM torrents
        WHERE torrent_id = #{torrentId}
    </select>
</mapper>