1. BeanPropertyRowMapper接口

1. 当我查询时，使用下面的接口，原理是根据实体类的字段名和表的列名相同时才有结果，否则对应的字段是null

List<MusicSong> songList = jdbcTemplate.query(sql.toString(), new Object[]{musicListId, startLine, endLine},new BeanPropertyRowMapper<>(MusicSong.class));

2. 创建mapper类实现接口

class MusicSongRowMapper implements RowMapper<MusicSong> {@Overridepublic MusicSong mapRow(ResultSet rs, int rowNum) throws SQLException {MusicSong song = new MusicSong();// 设置结果集song.setSongId(rs.getLong("music_song_id"));song.setTitle(rs.getString("music_title"));song.setCoverImg(rs.getString("music_cover_img"));song.setSinger(rs.getString("music_singer"));song.setDetails(rs.getString("music_details"));song.setListeningVolume(rs.getLong("music_listening_volume"));song.setLyricsId(rs.getLong("lyrics_id"));song.setCreateDate(rs.getDate("music_create_date"));return song;}
}

变更如下，用子类

List<MusicSong> songList = jdbcTemplate.query(sql.toString(), new Object[]{musicListId, startLine, endLine},new MusicSongRowMapper());