Hibernate，从一对多关系中只保存一行

Question

我有两个实体： -

Sales.Java

@Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int salesId;
    private BigDecimal discount;
    private BigDecimal totalTransaction;

    @OneToMany(mappedBy = "sales", cascade = CascadeType.ALL)
    private List<ProductSalesDetails> productSalesDetails = new ArrayList<>();

   public List<ProductSalesDetails> getProductSalesDetails() {
        return productSalesDetails;
    }

    public void addProductSalesDetails(ProductSalesDetails productSalesDetails) {
        this.productSalesDetails.add(productSalesDetails);
    }

另一个实体是： -

ProductSalesDetails.java

@Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private String category,name,vendor;

    private int  quantity;
    private BigDecimal price;

    private BigDecimal totalSalesAmount;

    @Temporal(TemporalType.DATE)
    private Date createdDate;

    private String salesBy;

    @ManyToOne
    private Sales sales;

现在我的前端表单数据是JSON，如下所示： -

[{category:"spa"
discount:""
grandTotal:3800
name:"toe cleaner"
price:"1200"
quantity:2
totalPrice:2400
vendor:"spa product"},
{category:"Hair"
discount:""
grandTotal:3800
name:"hair wash shampoo"
price:"700"
quantity:2
totalPrice:1400
vendor:"hair vendor"}]

我的DAO课程： -

public void createBill(List<ProductSales> salesList) {

        Sales s = new Sales();
        ProductSalesDetails ps = new ProductSalesDetails();

        for (ProductSales p : salesList){
            RgProduct rgProduct = productDao
.getSingleProductByProductName(p.getName());

            s.setDiscount(p.getDiscount());
            s.setTotalTransaction(p.getGrandTotal());

            ps.setCategory(p.getCategory());
            ps.setName(p.getName());
            ps.setQuantity(p.getQuantity());
            ps.setVendor(p.getVendor());
            ps.setPrice(rgProduct.getCostPrice());
            ps.setTotalSalesAmount(p.getTotalPrice());
            ps.setCreatedDate(new Date());
            ps.setSalesBy("sagar");

            s.addProductSalesDetails(ps);
            ps.setSales(s);

        }
        em.persist(s);

        for(ProductSalesDetails pds : s.getProductSalesDetails()){
            em.persist(pds);
        }
}

所以现在我想在销售表中保存grandtotal和折扣，而其他细节应保存在ProductSalesDetails表中。我试图把销售和ProductSalesDetails之间的关系。

ProductSalesDetails将有一个外键列，它将映射到sales表的主键。

我的理想数据库行如下所示： -

销售表

和产品详情表： -

目前，sales表正在按需保存，但在产品详细信息表中，无论列表中存在多少行，都只保存一行。