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Question

刪除從映射表中的數據我有2個實體中有一個是頭，另一種是項目

頭有很多項目

頁眉代碼如下

@Entity 
public class Headertable { 

    @Id 
    @GeneratedValue 
    private int headerId; 

    private String headerText; 

    @OneToMany(mappedBy="itemId.header",cascade=CascadeType.ALL,fetch=FetchType.EAGER) 
    private List<Items> items = new ArrayList<Items>(); 
    ... 
    getter and setters for these 

和項目表如下

@Entity 
public class Items { 

    @EmbeddedId 
    private ItemId itemId; 

    private String itemData; 
    .... getter and setters for these 

商品表id類

@Embeddable 
public class ItemId implements Serializable{ 

    @ManyToOne 
    private Headertable header; 

    private int itemId; 
    ...setter and getters 

下面是測試代碼從郵件頭中刪除一個項如下

Session session = this.sessionFactory.openSession(); 
    session.beginTransaction(); 
    Headertable header = (Headertable) session.get(Headertable.class, 1); 

    Iterator<Items> iterator = header.getItems().iterator(); 
    while(iterator.hasNext()) 
    { 
     Items items = iterator.next(); 
     if(items.getItemData().equals("chiru")) 
     { 
     iterator.remove(); 
     } 
    } 
    session.saveOrUpdate(header); 
    Transaction transaction = session.getTransaction(); 
    transaction.commit(); 

Answer 1

你必須刪除的項目：

session.delete(items);

卸下從逆側的基準如果不使用orphanRemoval，則不會影響保存的數據。