批处理更新从更新返回意外行计数时收到错误

Question

我的代码出现以下错误。

Hibernate: insert into EMPLOYEE (FIRST_NAME, LAST_NAME, SALARY, ID) values (?, ?, ?, ?)
Hibernate: update CERTIFICATE set ID=? where ID=?
org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1
    at org.hibernate.jdbc.Expectations$BasicExpectation.checkBatched(Expectations.java:81)
    at org.hibernate.jdbc.Expectations$BasicExpectation.verifyOutcome(Expectations.java:73)
    at org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:63)

这是我的代码。

employee.Java

@Entity
@Table(name="EMPLOYEE")
public class Employee {

    @Id
    @Column(name="ID")
   private int id;

    @Column(name="FIRST_NAME")
   private String firstName; 
    @Column(name="LAST_NAME")
   private String lastName;   
    @Column(name="SALARY")
   private int salary;


    @OneToMany
    @JoinColumn(name = "ID")
     @OrderBy("name ASC")
   private SortedSet<Certificate> certificates;
//getters and setters

}

certificate.Java

@Entity
@Table(name="CERTIFICATE")
public class Certificate implements Comparable <Certificate>{

    @Id
    @Column(name="ID")
       private int id;
    @Column(name="CERTIFICATE_NAME")
       private String name; 
    //generate getters and setters
   }

我正在尝试使用以下代码添加用户。

ManageEmployee ME = new ManageEmployee();
      /* Let us have a set of certificates for the first employee  */
      TreeSet set1 = new TreeSet();
      set1.add(new Certificate("MCA"));
      set1.add(new Certificate("MBA"));
      set1.add(new Certificate("PMP"));

      /* Add employee records in the database */
      Integer empID1 = ME.addEmployee("Manoj", "Kumar", 4000, set1);

并使用我的addEmployee方法，我有下面的代码

Employee employee = new Employee(fname, lname, salary);
         employee.setCertificates(cert);
         employeeID = (Integer) session.save(employee); 

请建议我应该从我的最终改变，以解决这个问题。

Answer 1

问题是因为默认情况下未设置id属性。我不得不更新我的代码以包含GeneratedValue注释并解决了这个问题。

   @Entity
@Table(name="EMPLOYEE")
public class Employee {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="ID")
   private int id;