@OneToMany删除子项 [英] @OneToMany delete children

问题描述

我有两个这样的实体：

public class Client {
  ...
@OneToMany(mappedBy = "client", cascade = { CascadeType.DETACH, CascadeType.MERGE, CascadeType.REFRESH, CascadeType.REMOVE },orphanRemoval = true, fetch=FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
@Cascade({ org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.DELETE_ORPHAN })
private List<CompanyContract> companyContracts;
  ...
}

CompanyContract：

CompanyContract :

public class CompanyContract {

...

@ManyToOne
@JoinColumn(name = "IDCLIENT")
private Client client;

...
}

我想要删除像这样的公司合同：

And I want to delete a companyContract like this :

client.getCompanyContracts().remove(companyContract)
client = clientService.updateClient(client);

但删除过程没有发生

我做错了什么？

编辑

这是我的updateClient方法在我的DAO中：

This is my updateClient method in my DAO :

@Override
@Transactional
public Client updateClient(Client client) {

    return entityManager.merge(client);
}

推荐答案

首先，你不要不需要设置 cascadeTypes 和 @Cascade 。我认为这可能是你问题的根源。

First of all, you don't need set cascadeTypes and @Cascade. I think it might be a source of your problems.

您是否覆盖 等于和 hashCode 在 ContractCompany 中？因为你可能没有从列表中删除所需的对象< ContactCompany>

Did you override equals and hashCode in ContractCompany? because maybe you are not removing the desired object from List<ContactCompany>

看看这个

@OneToMany(mappedBy = "client", ...)

mappedBy 通知hibernate该客户端是此关系的所有者，因此您需要获取 client ，获取 clientContracts 列表，删除一个（确保从列表中删除），更新客户端和删除对象。

mappedBy informs hibernate that client is the owner of this relation, so you need to get client, get a list of clientContracts, remove one (make sure it's removed from the list), update client and removed object.

以下示例源代码

CompanyContract toBeRemoved = //companyContract which you want to delete
client.getCompanyContracts().remove(toBeRemoved);
toBeRemoved.client = null;

保存两个对象， toBeRemoved 和客户

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