Question

我有一个使用Spring和Hibernate数据库的简单Oracle应用程序。它具有两个实体（City和Address），它们通过外键相互关联（地址实体具有city_id）。当我尝试创建或更新新的City实体时，一切正常，但是当我尝试创建新的Address实体时，出现错误：

ORA-01400: cannot insert NULL into ("SCHEME"."ADDRESS"."ID")

这是来自日志的休眠查询：

SQL: insert into address (is_actual, address, create_date, last_modification_date, city_id) values (?, ?, ?, ?, ?)

很显然，它不会生成新的地址实体的ID ，甚至也不会在查询中添加它。而且我不明白为什么会这样。

这是我的城市班的一部分：

@Entity
@Table(name = "city")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
@NamedQuery(name = "findById", query = "select distinct c from City c where c.id = :id")
public class City {
    private Long id;
    private String name;
    private Date createDate;
    private Date lastModificationDate;
    private Boolean isActual;

    private Address address;

    @Id
    @Column(name = "id", updatable = false, insertable = true)
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "id_seq")
    @SequenceGenerator(name = "id_seq", sequenceName = "SEQ_CITY", allocationSize = 1)
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @OneToOne(mappedBy = "city", fetch = FetchType.LAZY, optional = false, cascade = CascadeType.ALL)
    @JsonBackReference
    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }
.......

这是我的地址课程的一部分

Entity
@Table(name = "address")
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})
public class Address {
    private Long id;
    private City city;
    private String address;
    private Date createDate;
    private Date lastModificationDate;
    private Boolean isActual;

    @Id
    @Column(name = "id", updatable = false, insertable = true)
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "id_s")
    @SequenceGenerator(name = "id_s", sequenceName = "SEQ_ADDR")
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @OneToOne(fetch = FetchType.LAZY, optional = false, cascade = CascadeType.ALL)
    @MapsId
    @JsonManagedReference
    public City getCity() {
        return city;
    }

    public void setCity(City city) {
        this.city = city;
    }
.......

我的数据库中有序列SEQ_ADDR：

CREATE SEQUENCE SEQ_ADDR
START WITH 1
INCREMENT BY 1
NOMAXVALUE;

以下是我的地址创建服务：

@Transactional(propagation = Propagation.REQUIRED)
public void addNewAddress() {
    try {
        SelectBox selectBox = getComponent("addNewAddressBox", CollapsibleBox.class).getComponent("citiesSelectBox", SelectBox.class);
        Long cityId = Long.parseLong(selectBox.getSelectedItems().get(0).getId());
        String addressStr = getComponent("addNewAddressBox", CollapsibleBox.class).getComponent("newAddressInput", TextInput.class).getText();
        Date today = new Date();

        City city = cityDAO.findById(cityId);

        Address address = new Address();

        address.setAddress(addressStr);
        address.setCity(city);
        address.setCreateDate(today);
        address.setActual(true);
        addressDAO.save(address);
    } catch(Exception e) {
        logger.error("ERROR: CAN'T ADD NEW ADDRESS: " + e.getMessage(), e);
    }
}

这是我的SAVE方法：

public Address save(Address address) {
        Session currentSession = sessionFactory.getCurrentSession();
        currentSession.persist(address);
        return address;
    }

这是日志文件的一部分：

2019-10-23 08:44:35,182 INFO  [stdout] (transport-[8H32M51S31763]-[test-azimuth-app]-[rejecting]-request-processing-[test-app]-thread-11) Hibernate: insert into address (is_actual, address, create_date, last_modification_date, city_id) values (?, ?, ?, ?, ?)
2019-10-23 08:44:35,185 INFO  [stdout] (transport-[8H32M51S31763]-[test-azimuth-app]-[rejecting]-request-processing-[test-app]-thread-11) 08:44:35.184 [transport-[8H32M51S31763]-[test-app]-[rejecting]-request-processing-[test-app]-thread-11] ERROR
org.hibernate.engine.jdbc.batch.internal.BatchingBatch - HHH000315: Exception executing batch [java.sql.BatchUpdateException: ORA-01400: cannot insert NULL into ("SCHEME"."ADDRESS"."ID")
2019-10-23 08:44:35,185 INFO  [stdout] (transport-[8H32M51S31763]-[test-app]-[rejecting]-request-processing-[test-app]-thread-11) ], SQL: insert into address (is_actual, address, create_date, last_modification_date, city_id) values (?, ?, ?, ?, ?)
2019-10-23 08:44:35,185 INFO  [stdout] (transport-[8H32M51S31763]-[test-azimuth-app]-[rejecting]-request-processing-[test-azimuth-app]-thread-11) 08:44:35.185 [transport-[8H32M51S31763]-[test-app]-[rejecting]-request-processing-[test-app]-thread-11] ERROR
org.hibernate.engine.jdbc.spi.SqlExceptionHelper - ORA-01400: cannot insert NULL into ("SCHEME."ADDRESS"."ID")

很明显，休眠状态会生成错误的查询，并且不会通过序列生成器生成ID：没有诸如 Hibernate之类的消息：在日志中从double 中选择SEQ_ADDR.nextval。您对此问题有什么建议吗？非常感谢！

Hibernate不会通过SequenceGenerator生成ID

0 个答案: