Question

我正在尝试使用casecadeALL插入一个onetomany关系表的记录。当表上发生任何DML时，我在审计表中有插入，更新或删除条目的审计信息。当我运行插入时，它在基表中插入记录正常但在审计期间我看到子表有单个插入的2个条目。它正在使用相同的记录更新表。无法理解为什么casecade都在几毫秒内更新同一条记录。

        parent class

    public class Department
    {

       /** The destination id. */
       @Id
       @SequenceGenerator(name = ....", sequenceName = ...)
       @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = ....)
       @Column(name = "DEST_ID", nullable = false, unique = true)
       private Long                             destinationId;
       /** The destination name. */
       @Column(name = "DEST_NM")
       private String                           destinationName;
       /** The Std UTC hour operation . */
       @OneToMany(cascade = {CascadeType.ALL}, fetch = FetchType.LAZY)
       @JoinColumn(name = "DEST_ID", nullable = false)
       private List<Hours> hrList = new ArrayList<Hours>();

    }

    child class
    public class Hours
    {

        @Id
        @SequenceGenerator(name = ...., sequenceName = ....)
        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = ....)
        @Column(name = "HR_ID")
        private Long hoursId;
        /** The Destination. */
        @ManyToOne(optional = true)
        @JoinColumn(name = "DEST_ID", nullable = false, insertable = false, updatable = false)
        private Department department;
    }


in service class calling -

departmentDao.saveOrupdate(department);

in DAO layer

public void saveOrUpdate(Department departmentToStore) {
        em.persist(departmentToStore);
}

我还有其他相关的表，但它们工作正常。我只有表oneToMany关系才有这个问题。

注意：表是单向的。我使用persist方法插入记录。

请查找整个代码 -

@Entity
@Table(name = "DEPARTMENT")
@XmlRootElement(name = "Department")
public class Department {
    /** The destination id. */
    @Id
    @SequenceGenerator(name = "deptSeq", sequenceName = "SEQ1")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "deptSeq")
    @Column(name = "DEST_ID", nullable = false, unique = true)
    private Long destinationId;
    /** The destination name. */
    @Column(name = "DEST_NM")
    private String destinationName;
    /** The hour operation . */
    @OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy = "department")
    private List<Hours> hoursList = new ArrayList<Hours>();
setter & getters ...
}
@Entity
@Table(name = "HOURS")
@XmlRootElement(name = "SpecialHoursOfOperation")
public class SpecialUTCHoursOfOperation {

    /** The hour id. */
    @Id
    @SequenceGenerator(name = "hourSeq", sequenceName = "SEQ2")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "hourSeq")
    @Column(name = "HR_ID")
    private Long hourId;
    /** The Destination. */
    @ManyToOne(optional = true)
    @JoinColumn(name = "DEST_ID", nullable = false, insertable = false, updatable = false)
    private Department department;
    /** The hoursdate. */
    @Column(name = "SPEC_HR_OPRT_DT")
    private Date HoursDate;
setters and getters
}

DepartmentDAOImpl class -
@Override
    @Transactional
    public Department saveOrUpdate(Department departmentToStore) {
        Department department = new Department();
        try {
            department = persist(departmentToStore);
        } catch (PersistenceException pe) {
            pe.getMessage();
        }
        return department;
    }

in DeptService.java
public DepartmentVO storeDepartment(DepartmentVO departmentVO){
Department department = new Department();
department = Helper.populateDepartment(departmentVO);
department.setHoursList(Helper.populateHours(departmentVO, department));
department = departmentDAO.saveOrUpdate(department);
return departmentVO;
}

in Helper.java

public static Department populateDepartment(final DepartmentVO departmentVO) {
Department department = new Department();
department.setDestinationName(departmentVO.getDepartmentName());
return department;
}

public static List<Hours> populateHours(final DepartmentVO departmentVO, final Department department) {
List<Hours> hoursList = new ArrayList<Hours>();
List<HoursVO> hoursVOs = departmentVO.getSpecialDayHourVOs();
for (HoursVO hoursVO : hoursVOs) {
            Hours hoursObj = new Hours();
hoursObj.setDepartment(department);
            hoursObj.setHoursDate(hoursVO.getSpecialDate());
hoursList.add(hoursObj);
}
return hoursList;
}

数据库表 - 部门（dest_id（pk），dest_nm），小时（hr_id（pk），dest_id（fk），hr_dt）。

然后我有休息层与前端沟通。如果我运行此代码当调试器到达save方法时，它会抛出异常。 UniqueCnstraintviolation ORA-01400：无法插入NULL（HOURS。“DEST_ID”）

Answer 1

如果您使用某些拦截器来记录审计信息，则会出现此问题，原因是单向映射。通常你的部门应该使用mappedBy，而小时应该使用带有joinColumn的引用。这会使它成为双向的。然后在保存时它不会激发额外的更新查询。你可以在互联网上阅读更多关于inverse = true / false和jpa的单向陷阱。更改为bi-di以防止额外的更新查询。

JPA- onetomany级联在子表中两次插入相同的记录

1 个答案: