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我有一个类Person和一个包含三个类的类层次结构，当我将 InheritanceType.TABLE_PER_CLASS 用于类层次结构时，它遇到了“批量更新”问题。请看下面的代码。AbstractBase是类层次结构的基类。 

public class Person {
  @Id
  @GeneratedValue(generator = "uuid")
  @GenericGenerator(name = "uuid", strategy = "uuid2")
  private String id; 

  @OneToMany
  @JoinColumn(name="Employee_employees_Person", referencedColumnName = "id")
  @Cascade({org.hibernate.annotations.CascadeType.PERSIST, org.hibernate.annotations.CascadeType.MERGE})
  private Set<Employee> employees = new HashSet<>();
 }

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@javax.persistence.Access(javax.persistence.AccessType.FIELD)
public abstract class AbstractBase {
@Id
@GeneratedValue(generator = "uuid")
@GenericGenerator(name = "uuid", strategy = "uuid2")
private String id;

public String getId() {
    return id;
}
public void setId(String id) {
    this.id = id;
}    
}

@Entity
@Table(name = "EmployeeClass")
@javax.persistence.Access(javax.persistence.AccessType.FIELD)
public class Employee extends AbstractBase implements Serializable {
    private String name;
    @Column(name="Employee_employees_Person")
    private String Employee_employees_Person_ID;
}

@Entity
public class Manager extends Employee {
   @Property(name="ManagerLevel")
   @Column(name="ManagerLevel")
   private String level;

   public String getLevel() {
      return level;
   }

   public void setLevel(String level) {
    this.level = level;
   }
}

测试代码：

em.getTransaction().begin();
Person a = new Person();
Employee e1 = new Employee();
e1.setName("Bill");

Manager m1 = new Manager();
m1.setName("Amanda");
m1.setLevel("VP");
a.getEmployees().add(e1);
a.getEmployees().add(m1);
em.persist(a);
em.getTransaction().commit();

输出：

org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1"

Manager我通过hibernate sql发现Hibernate没有更新表。当我将 InheritanceType 更改为 时InheritanceType.JOINED，代码运行良好。我错过了单向一对多配置中的某些内容吗？

- - - - - - - - - - - - - - - - - 更新 - - - - - - - - -----------------

在“Person”类中，我在一对多注释中将@JoinColumn 更改为@JoinTable，测试代码运行良好。当@JoinColumn 的目标类被“InheritanceType.TABLE_PER_CLASS”注解时，是否有遗漏配置？

请看下面的详细注释：

@OneToMany
//@JoinColumn(name="Employee_employees_Person", referencedColumnName = "id")
@JoinTable (
        name = "Person_employees_Employee",
        joinColumns={ @JoinColumn(name="Person_ID", referencedColumnName="id") },
        inverseJoinColumns={ @JoinColumn(name="Employee_ID", referencedColumnName="id", unique=true)}
)
@Cascade({org.hibernate.annotations.CascadeType.PERSIST, org.hibernate.annotations.CascadeType.MERGE})
private Set<Employee> employees = new HashSet<>();

- - - - - - - - - - - - - - - - - - -更新 - - - - - - --------------------

我用 Hibernate 5.2.5 Final 尝试了代码，问题仍然存在。

4

1 回答 1

0

也许它与HHH-9864有关。尝试使用 Hibernate 5.2.5，看看它是否工作得更好。

于 2016-12-13T15:05:05.367 回答