Hibernate在merge（）操作中插入空實體

我在實體圖中調用函數merge（）作爲根元素。這些實體是級聯的。在圖中有持久和瞬時元素。我插入了一個空的額外實體。實體：Hibernate在merge（）操作中插入空實體

@Entity 
public class CnTermsAmortization { 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    Long id; 

    @ManyToOne 
    private CnTermsCounted cnTermsCounted; 

    @ManyToOne 
    private CnTermsBudget cnTermsBudget; 

    ... 

} 

@Entity 
public class CnTermsBudget { 

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

    @OneToMany(mappedBy = "cnTermsBudget") 
    Set<CnTermsAmortization> amortizations = new HashSet<>(); 

    @ManyToOne 
    private CnTermsGroup cnTermsGroup; 

    ..... 

} 

@Entity 
public class CnTermsCounted { 
    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    Long id; 

    @OneToMany(mappedBy = "cnTermsCounted", cascade=CascadeType.ALL, orphanRemoval=true) 
    private Set<CnTermsAmortization> amortizations = new HashSet<>(); 

    @ManyToOne 
    private CnTermsGroup cnTermsGroup; 
    ..... 
} 

@Entity 
public class CnTermsGroup { 

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

    @OneToMany(mappedBy="cnTermsGroup", cascade=CascadeType.ALL, orphanRemoval=true) 
    private List<CnTermsCounted> cnTermsCounteds = new ArrayList<>(); 

    @OneToMany(mappedBy="cnTermsGroup", cascade=CascadeType.ALL, orphanRemoval=true) 
    private List<CnTermsBudget> cnTermsBudgets = new ArrayList<>(); 

    ..... 
}

控制器：

public static void main(String[] args) { 
    // Insert data to database 
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("jpa");  
    EntityManager em1 = emf.createEntityManager();   
    CnTermsBudget budget = new CnTermsBudget(); 
    CnTermsCounted counted = new CnTermsCounted(); 

    CnTermsGroup group = new CnTermsGroup(); 
    group.getCnTermsBudgets().add(budget); 
    group.getCnTermsCounteds().add(counted); 

    budget.setCnTermsGroup(group); 
    counted.setCnTermsGroup(group); 

    EntityTransaction t1 = em1.getTransaction(); 
    t1.begin(); 

    Long id = em1.merge(group).getId(); 

    t1.commit(); 
    em1.close(); 

    //Create transient entity 
    CnTermsAmortization amortization = new CnTermsAmortization();   

    EntityManager em = emf.createEntityManager(); 

    EntityTransaction t = em.getTransaction(); 
    t.begin(); 

    //Read persistent graph 
    group = em.find(CnTermsGroup.class, id); 

    budget = group.getCnTermsBudgets().get(0); 
    counted = group.getCnTermsCounteds().get(0); 

    //Add transient entity to persistent tree 
    budget.getAmortizations().add(amortization); 
    counted.getAmortizations().add(amortization); 

    amortization.setCnTermsBudget(budget); 
    amortization.setCnTermsCounted(counted); 

    //merge on the root 
    em.merge(group); 

    t.commit(); 

    em.close(); 



    em = emf.createEntityManager(); 

    List<?> ls = em.createQuery("from CnTermsAmortization").getResultList(); 
    System.out.println(Arrays.toString(ls.toArray())); 

    em.close(); 
    emf.close(); 
}

在Hibernate日誌，我看到兩個實體插入：

休眠：插入CnTermsAmortization（cnTermsBudget_id，cnTermsCounted_id，ID）值（，休眠：插入CnTermsAmortization（cnTermsBudget_id，cnTermsCounted_id，id）值（？，？，？）

在控制器輸出我看到它們中的一個在各個領域具有空：

[CnTermsAmortization [ID = 1，[email protected]，[email protected]]，CnTermsAmortization [ID = 2，cnTermsCounted = null，cnTermsBudget = null]]

當我調用所有實體都是Transient的圖形根的merge（）時，輸出中有一個實體具有填充值。我使用Hibernate版本5.1.1，JPA接口。我錯過了什麼嗎？

來源

2017-05-17 Yaroslav Petrukhno

這是錯誤。它已被修復。有關bugfix的信息請點擊這裏：https://hibernate.atlassian.net/browse/HHH-9512

來源

2017-05-17 12:02:19

Hibernate在merge（）操作中插入空實體

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