Hibernate使用BigDecimal而不是Int

import javax.persistence.*;
import java.math.BigDecimal;

@Entity
@Table(name = "products")
public class Product {

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

    private String name;

    @Column(precision = 19, scale = 4)
    private BigDecimal price;

    // Getters and Setters
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }
}

CREATE TABLE products (
    id BIGINT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255),
    price DECIMAL(19, 4)
);

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class ProductDao {

    private SessionFactory sessionFactory;

    public ProductDao() {
        sessionFactory = new Configuration().configure().buildSessionFactory();
    }

    public void saveProduct(Product product) {
        Session session = sessionFactory.openSession();
        Transaction tx = null;
        try {
            tx = session.beginTransaction();
            session.save(product);
            tx.commit();
        } catch (Exception e) {
            if (tx != null) tx.rollback();
            e.printStackTrace();
        } finally {
            session.close();
        }
    }

    public Product getProductById(Long id) {
        Session session = sessionFactory.openSession();
        try {
            return session.get(Product.class, id);
        } finally {
            session.close();
        }
    }

    // Other CRUD operations...
}