@Entity
@Table(name = "product")
public class ProductEntity{
     ....
     private long productId;
     private List<StockEntity> stockEntityList;
     ....

     @Id
     @Column(name="productId")
     public long getProductId(){
         return this.productId;
     }

     @OneToMany(mappedBy="productEntity", fetch= FetchType.EAGER
                  cascade={CascadeType.ALL,CascadeType.PERSIST,CascadeType.MERGE},
                  orphanRemoval = true)
     public List<StockEntity> getStockEntityList(){
                  return this.stockEnityList;
     }

     public void setStockEntityList(List<StockEntity> stockEntityList){...}
     ....
}

@Entity
@Table(name = "stock")
public class StockEntity{
    ...
    private ProductEntity productEntity;
    private long startTime;
    ...
    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="productId")
    public ProductEntity getProductEntity(){
         return this.producntEntity;
    }

    @Id
    @Column(name="startTime")
    public long getStartTime(){
        return this.startTime;
    }

    ....
}

public void consumeStockQuantity(long productId, long startTime, int count){
     Session session = HBSession.getSession();
     Transaction tx = session.beginTransaction();
     ProductEntity productEntity = session.get(productId, ProductEntity.class);
     for(StockEntity stockEntity: productEntity.getStockEntityList()){
         if(stockEntity.getStartTime() == startTime){
            stockEntity.setQuantity(stockEntity.getQuantity-count);
         }
     }
     try{
        session.update(productEntity);
        tx.commit();
     }catch(Exception e){
        e.printStackTrace();
        tx.rollback();
     }finally{
        session.close();
     }
 }

Hibernate:
    update
        test.stock
    set
        marketPrice=?,
        productId=?,
        purchasePrice=?,
        quantity=?,
        sellPrice=?
    where
        startTime=?
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [FLOAT] - [1.2]
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [2] as [BIGINT] - [1075]
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [3] as [FLOAT] - [0.01]
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [4] as [BIGINT] - [1000]
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [5] as [FLOAT] - [0.01]
HibernateLog --> 15:35:27 TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [6] as [BIGINT] - [1438175312412]