jpa删除manytomany链接
我有一个事件表，我想将它们分组。 当我想完全删除组时，但当我想更新组以删除一些链接，让事件仍然存在时，这些注释就可以
// this cascade group still removes the join table but not the products table
@ManyToMany(targetEntity=Product.class,fetch = FetchType.EAGER, cascade =
{CascadeType.PERSIST, CascadeType.REFRESH,CascadeType.MERGE})
@JoinTable(name = "lcw_group_product",
joinColumns = { @JoinColumn(name = "group_id", referencedColumnName="id") },
inverseJoinColumns = { @JoinColumn(name = "product_id", referencedColumnName="id") })
@ElementForeignKey(updateAction = ForeignKeyAction.CASCADE)
public Set getProducts() {
return products;
}
工作，我找不到方法来做到这一点，我是当前正在执行链接表的删除语句，但这不会反映在父实体中
I have a table of events and i want to make groups of them. that is the easy easy
// this cascade group still removes the join table but not the products table
@ManyToMany(targetEntity=Product.class,fetch = FetchType.EAGER, cascade =
{CascadeType.PERSIST, CascadeType.REFRESH,CascadeType.MERGE})
@JoinTable(name = "lcw_group_product",
joinColumns = { @JoinColumn(name = "group_id", referencedColumnName="id") },
inverseJoinColumns = { @JoinColumn(name = "product_id", referencedColumnName="id") })
@ElementForeignKey(updateAction = ForeignKeyAction.CASCADE)
public Set getProducts() {
return products;
}
These annotations work when i want to completely remove the group but when i want to update the group to remove some of the links, leaving the events still there, i can't find a way to do this, i am currently doing delete statements of the link table but this doesn't get reflected in the parent entity
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只是为了澄清 ElementForeignKey 是一个 OpenJPA 注释，而不是 JPA 注释。
不幸的是，到目前为止，ManyToMany 注释还没有 orphanRemoval 属性。
Just to clarify that the ElementForeignKey is an OpenJPA annotation, not a JPA one.
Unfortunately, so far there is no orphanRemoval attribute for the ManyToMany annotation.