JPA 上的连接获取中返回的子项数量错误

发布于 2024-10-09 14:39:43 字数 409 浏览 5 评论 0原文

有一个 JPA OneToMany 关联

@OneToMany(mappedBy = "playlist", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@IndexColumn(name = "intSequence")
private List<Track> tracks;

我在相册类中

。当我使用 join fetch 加载专辑的曲目时，我将 3 个相同的曲目放入内存，而数据库中实际上有 3 个不同的专辑曲目，这恰好是 mysql 数据库中的最后一个曲目。
如果我将“列表”更改为“设置”，它将起作用 - 我得到所有 3 个曲目并且一切正常。我查了很多谷歌搜索和 JPA 文档，到目前为止还没有任何线索。有人可以给我一些线索吗？

原文

I have a JPA OneToMany association

@OneToMany(mappedBy = "playlist", fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@IndexColumn(name = "intSequence")
private List<Track> tracks;

in class Album.

When I am using join fetch to load the tracks of the album, I get 3 identical tracks into memory while there are actually 3 different tracks for the album in the database, which happens to be the last track in the mysql database.
It will work if I change the List to Set -- I get all 3 tracks and things work. I did lots of googling and JPA documentations, no clue so far. Can someone give me some clue.

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