hibernate 级联更新

Bertha 。 2022-04-12 10:20 268阅读 0赞

@Entity
    @Table(name = "customer_order_hd")
    @NamedQuery(name = "CustomerOrderHd.findAll", query = "SELECT c FROM CustomerOrderHd c")
    public class CustomerOrderHd implements Serializable {
       
    	private static final long serialVersionUID = 1L;
    
    	@Id
    	@GeneratedValue(strategy = GenerationType.IDENTITY)
    	@Column(name = "order_no", unique = true, nullable = false)
    	private Long orderNo;
    
    	@Column(name = "create_by", length = 50)
    	private String createBy;
    
    	@Column(name = "create_date")
    	private Timestamp createDate;
    
    	@Column(name = "customer_id")
    	private Long customerId;
    
    	@Temporal(TemporalType.DATE)
    	@Column(name = "order_date")
    	private Date orderDate;
    
    	@Column(name = "order_remark", length = 250)
    	private String orderRemark;
    
    	@Column(name = "order_status", length = 10)
    	private String orderStatus;
    
    	@Column(name = "order_total_amount", precision = 10, scale = 2)
    	private BigDecimal orderTotalAmount;
    
    	@Column(name = "purchased_location", length = 50)
    	private String purchasedLocation;
    
    	@Column(name = "purchaser_name", length = 80)
    	private String purchaserName;
    
    	@Column(name = "staff_user_id", length = 50)
    	private String staffUserId;
    
    	@Column(name = "update_by", length = 50)
    	private String updateBy;
    
    	@Temporal(TemporalType.TIMESTAMP)
    	@Column(name = "update_date")
    	private Date updateDate;
    
    	// bi-directional many-to-one association to CustomerOrderDet
    	@OneToMany(mappedBy = "customerOrderHd")
    	//@OneToMany(cascade={CascadeType.MERGE, CascadeType.ALL})
    	//@JoinColumn(name="order_no", nullable=false)
    	private List<CustomerOrderDet> customerOrderDets;
    
    	// bi-directional many-to-one association to CustomerOrderTran
    	@OneToMany(mappedBy = "customerOrderHd", cascade = CascadeType.MERGE)
    	private List<CustomerOrderTrans> customerOrderTranses;

@Entity
    @Table(name="customer_order_det")
    @NamedQuery(name="CustomerOrderDet.findAll", query="SELECT c FROM CustomerOrderDet c")
    public class CustomerOrderDet implements Serializable {
       
    	private static final long serialVersionUID = 1L;
    
    	@Id
    	@GeneratedValue(strategy=GenerationType.IDENTITY)
    	@Column(name="order_det_id", unique=true, nullable=false)
    	private Long orderDetId;
    
    	@Column(name="create_by", length=50)
    	private String createBy;
    
    	@Column(name="create_date")
    	private Timestamp createDate;
    
    	@Column(name="item_remark", length=100)
    	private String itemRemark;
    
    	@Column(name="item_total_amout", precision=10, scale=2)
    	private BigDecimal itemTotalAmout;
    
    	@Column(name="order_qty")
    	private int orderQty;
    
    	@Column(name="update_by", length=50)
    	private String updateBy;
    
    	@Temporal(TemporalType.TIMESTAMP)
    	@Column(name="update_date")
    	private Date updateDate;
    
    	//bi-directional many-to-one association to CustomerOrderHd
    	@ManyToOne(cascade={CascadeType.MERGE, CascadeType.ALL})
    	@JoinColumn(name="order_no", nullable=false)
    	private CustomerOrderHd customerOrderHd;

@OneToMany(mappedBy = "customerOrderHd"):意思是让对方维护关联关系，如果保存CustomerOrderHd对象不会级联更新customerOrderDets；  
@JoinColumn(name="order\_no", nullable=false)：name的值为外键字段名  
mappedBy和JoinColumn的意思正好相反，不能同时用在一个字段上。  
注意：many方即子表方不管怎样都有权维护关联关系。