Java 外键值在OneToMany映射中插入值为null

你好，Stackoverflow，我很难使用OneToMany映射，从早上开始我就在谷歌上搜索以找到解决方案，但没有任何帮助

我正在尝试@OneToMany映射关系。 以下是课程：

班级：1

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "cbid")
private int cbid;

@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "cid", referencedColumnName = "custid", insertable = false, updatable = false)
private CustomerDetails customerDetails;

@Column(name = "customerid")
private Integer customerid;
@Column(name = "subtotal")
private Double subtotal;
@Column(name = "tax_amount")
private Double tax_amount;
@Column(name = "total_amount")
private Double total_amount;
@Column(name = "paid_amount")
private Double paid_amount;
@Column(name = "amount_due")
private Double amount_due;
@Column(name = "invoiceNumber")
private int invoiceNumber;
@Column(name = "d")
private Date d;

@OneToMany(mappedBy="cbpd", cascade=CascadeType.ALL, fetch=FetchType.LAZY)
@OrderColumn(name="lindex")
private List<ProductNameBuyingDetails> pnbd = new ArrayList<ProductNameBuyingDetails>();
//setters and getters

我以这种方式使用session.save（）方法

CustomerBuyingProductsDetails customerBuyingProductsDetails = new CustomerBuyingProductsDetails();
    customerBuyingProductsDetails.setCustomerid(customerBuyingProducts.getCustomerid());
    customerBuyingProductsDetails.setInvoiceNumber(customerBuyingProducts.getInvoiceNumber());
    customerBuyingProductsDetails.setAmount_due(customerBuyingProducts.getAmount_due());
    customerBuyingProductsDetails.setD(customerBuyingProducts.getD());
    customerBuyingProductsDetails.setPaid_amount(customerBuyingProducts.getPaid_amount());
    customerBuyingProductsDetails.setSubtotal(customerBuyingProducts.getSubtotal());
    customerBuyingProductsDetails.setTax_amount(customerBuyingProducts.getTax_amount());
    customerBuyingProductsDetails.setTotal_amount(customerBuyingProducts.getTotal_amount());
    sessionFactory.getCurrentSession().save(customerBuyingProductsDetails);

    Iterator<Integer> itrNum = customerBuyingProducts.getProductNumber().iterator();
    Iterator<String> itrName = customerBuyingProducts.getProductName().iterator();
    Iterator<Double> itrPrice = customerBuyingProducts.getProductPrice().iterator();
    Iterator<Double> itrQuan = customerBuyingProducts.getProductQuantity().iterator();
    Iterator<Double> itrTotal = customerBuyingProducts.getProductTotal().iterator();
    int i=0;
    while (itrNum.hasNext()) {

        ProductNameBuyingDetails pnbd = new ProductNameBuyingDetails();
        pnbd.setProductNumber(itrNum.next());
        pnbd.setProductName(itrName.next());
        pnbd.setProductPrice(itrPrice.next());
        pnbd.setProductQuantity(itrQuan.next());
        pnbd.setProductTotal(itrTotal.next());
        pnbd.setCbpd(customerBuyingProductsDetails);
        sessionFactory.getCurrentSession().save(pnbd);
        customerBuyingProductsDetails.getPnbd().add(pnbd);
    }
    sessionFactory.getCurrentSession().save(customerBuyingProductsDetails);

}

外键值未插入，在数据库表中显示为空（null） 我无法纠正我的错误。 提前感谢。。

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希望一切顺利。

您的设置似乎是可更新的，可插入为false。这意味着它们是只读的。请查看下面的链接

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我认为问题可能是您将@JoinColumn可插入的属性设置为false，这意味着该列将不会包含在任何插入语句中。此外，如果执行updateable=false，则它将不会包含在任何UPDATE语句中

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有关更多信息，请参阅文章。

谢谢：）您让我开心。如果问题因其中一个答案而得到解决，您能接受吗？：）

CustomerBuyingProductsDetails customerBuyingProductsDetails = new CustomerBuyingProductsDetails();
    customerBuyingProductsDetails.setCustomerid(customerBuyingProducts.getCustomerid());
    customerBuyingProductsDetails.setInvoiceNumber(customerBuyingProducts.getInvoiceNumber());
    customerBuyingProductsDetails.setAmount_due(customerBuyingProducts.getAmount_due());
    customerBuyingProductsDetails.setD(customerBuyingProducts.getD());
    customerBuyingProductsDetails.setPaid_amount(customerBuyingProducts.getPaid_amount());
    customerBuyingProductsDetails.setSubtotal(customerBuyingProducts.getSubtotal());
    customerBuyingProductsDetails.setTax_amount(customerBuyingProducts.getTax_amount());
    customerBuyingProductsDetails.setTotal_amount(customerBuyingProducts.getTotal_amount());
    sessionFactory.getCurrentSession().save(customerBuyingProductsDetails);

    Iterator<Integer> itrNum = customerBuyingProducts.getProductNumber().iterator();
    Iterator<String> itrName = customerBuyingProducts.getProductName().iterator();
    Iterator<Double> itrPrice = customerBuyingProducts.getProductPrice().iterator();
    Iterator<Double> itrQuan = customerBuyingProducts.getProductQuantity().iterator();
    Iterator<Double> itrTotal = customerBuyingProducts.getProductTotal().iterator();
    int i=0;
    while (itrNum.hasNext()) {

        ProductNameBuyingDetails pnbd = new ProductNameBuyingDetails();
        pnbd.setProductNumber(itrNum.next());
        pnbd.setProductName(itrName.next());
        pnbd.setProductPrice(itrPrice.next());
        pnbd.setProductQuantity(itrQuan.next());
        pnbd.setProductTotal(itrTotal.next());
        pnbd.setCbpd(customerBuyingProductsDetails);
        sessionFactory.getCurrentSession().save(pnbd);
        customerBuyingProductsDetails.getPnbd().add(pnbd);
    }
    sessionFactory.getCurrentSession().save(customerBuyingProductsDetails);

}

Hibernate: insert into cb (amount_due, customerid, d, invoiceNumber, paid_amount, subtotal, tax_amount, total_amount, cbid) values (?, ?, ?, ?, ?, ?, ?, ?, ?)
Hibernate: insert into prodnamebuy (productname, productnumber, productprice, productquantity, producttotal, byno) values (?, ?, ?, ?, ?, ?)