Question

我有一个名为“Document”的对象，它与“DocumentPersonCc”具有一对多的关系。我试图在我的代码中更改一个或多个这些集合，但Hibernate并没有在我期望的时候调用更新查询。当我更改其中一个常规字段（如文档主题）时，它会调用更新查询，但即使这样，它也不会保留数据库中的任何一对多更改。为了让它发挥作用我需要改变什么？

DocumentPersonCc的Getter和setter：

@OneToMany(fetch = FetchType.LAZY, mappedBy = "document")
@LazyCollection(LazyCollectionOption.EXTRA)
@Sort(type = SortType.NATURAL, comparator = DocumentPersonCc.class)
public SortedSet<DocumentPersonCc> getDocumentPersonCcs() {
    return this.documentPersonCcs;
}

public void setDocumentPersonCcs(
        SortedSet<DocumentPersonCc> documentPersonCcs) {
    this.documentPersonCcs = documentPersonCcs;
}

更新代码：

public Document updateCcs(Document document) {
    Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    session.beginTransaction();
    Document oldD = (Document) session.load(Document.class, document.getId());
    Hibernate.initialize(oldD.getDocumentPersonCcs());
    oldD.setDocumentPersonCcs(document.getDocumentPersonCcs());
    session.update(oldD);
    session.getTransaction().commit();
    document = this.returnDocument(document.getId());
    Hibernate.initialize(document.getDocumentPersonCcs());
    return document;
}

DocumentPersonCc的Document getter和setter：

@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "DocumentsId", nullable = false, insertable = false, updatable = false)
protected Document getDocument() {
    return this.document;
}

public void setDocument(Document document) {
    this.document = document;
}

Answer 1

试试这个 -

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "document")
@LazyCollection(LazyCollectionOption.EXTRA)
@Sort(type = SortType.NATURAL, comparator = DocumentPersonCc.class)
public SortedSet<DocumentPersonCc> getDocumentPersonCcs() {
    return this.documentPersonCcs;
}

使用级联更新子映射

Answer 2

在Document实体类中使用cascade。 `

@OneToMany(fetch = FetchType.LAZY, mappedBy = "document")
@LazyCollection(LazyCollectionOption.EXTRA)
@Sort(type = SortType.NATURAL, comparator = DocumentPersonCc.class)
@Cascade({CascadeType.SAVE_UPDATE}) 
public SortedSet<DocumentPersonCc> getDocumentPersonCcs() {
    return this.documentPersonCcs;
}

`然后在保存或更新文档实体时保存或更新集合。

Answer 3

在Document.java中添加一个方法

 public void addDocumentPersonCc(DocumentPersonCc documentPersonCc) {
    documentPersonCc.setDocument(this);
    documentPersonCcs.add(documentPersonCc);
 }

现在将updateCcs方法更改为

public Document updateCcs(Document document) {
    Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    session.beginTransaction();
    Document oldD = (Document) session.load(Document.class, document.getId());
    Hibernate.initialize(oldD.getDocumentPersonCcs());
    SortedSet<DocumentPersonCc> documentPersonCcsList = document.getDocumentPersonCcs();
    //Iterate this documentPersonCcsList

    {
        // add oldD.addDocumentPersonCc(Value from Iterator);
    }    
    session.update(oldD);
    session.getTransaction().commit();
    document = this.returnDocument(document.getId());
    Hibernate.initialize(document.getDocumentPersonCcs());
    return document;
}

如何在Hibernate中更新集合？

3 个答案: