Hibernate插入连接表
我得到了几个实体。其中两个建立了多对多关系。当我对这些实体执行更大的操作时，它会失败并出现以下异常：
org.hibernate.exception.ConstraintViolationException: could not insert collection rows:
我在 @Transactional 上下文中执行操作。我不会对我的 daos 进行任何明确的刷新。刷新由查询触发。队列中有 15 个元素（全部具有相同的结构）。其中一个总是失败（但它总是不同的（我检查过）并且总是在不同的位置）。
有人对我可能做错的事情有提示吗？
我的映射：
@ManyToMany(targetEntity = CategoryImpl.class)
protected Set<Category> categories = new HashSet<Category>();
I got several entities. Two of them got a many-to-many relation. When I do a bigger operation on these entities it fails with this exception:
org.hibernate.exception.ConstraintViolationException: could not insert collection rows:
I execute the operation i a @Transactional context. I don't do any explicit flushing i my daos. The flush is triggered by a query. In the queue are 15 elements (all of the same structure). one of them always fails (but it's always a different one (I checked) and always at a different position).
Does anybody have a hint for me for what I might do wrong?
My Mapping:
@ManyToMany(targetEntity = CategoryImpl.class)
protected Set<Category> categories = new HashSet<Category>();
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以目前的详细程度很难说。该关联是双向的吗？您是否定义了一个拥有方（另一方有
mappedBy）？您能否启用日志记录以查看执行的查询并确定导致问题的查询。Hard to say with the current level of detail. Is the association bidirectional? Do you have one owning side (with a
mappedByon the other side) defined? Can you enable logging to see the executed queries and identify the one which is causing the problem.