查找实体时休眠意外删除

Question

我们有一个在 JBoss 6.4 GA 上运行的 Java ee 应用程序，使用 JPA 和 Hibernate 和以下实体：@Entity@SequenceGenerator(name = "sequence", sequenceName="SEQ_CAMPAIGNS_ID",allocationSize = 1)@Table(name = "CAMPAIGN")public class CampaignEntity implements Serializable {@Id@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "sequence")@Column(name = "ID")private Long id;@Column(name = "NAME")private String name;@Column(name = "IS_ACTIVE", nullable = false)private boolean active;@Column(name = "START_DATE", nullable = false)private Date startDate;@Column(name = "END_DATE", nullable = false)private Date endDate;@Column(name = "LEGAL_ENTITY_ID", nullable = false)private Integer legalEntityId;@Column(name = "DEPARTMENT", nullable = false)@Enumerated(value = EnumType.STRING)private Department department;@Column(name = "CATEGORY", nullable = false)@Enumerated(value = EnumType.STRING)private Category category;@EmbeddedCampaignConditionsEntity campaignConditions;@OneToMany(cascade = CascadeType.ALL, mappedBy = "campaign", orphanRemoval = true)@OrderByprivate List<CodeEntity> campaignCodes;public CampaignEntity() {}以及以下 CampaignConditionsEntity：@Embeddablepublic class CampaignConditionsEntity implements Serializable {private static final String CAMPAIGN_ID = "CAMPAIGN_ID";@ElementCollection(fetch = FetchType.EAGER)@CollectionTable(name = "CAMPAIGN_COND_TRIP_TYPE", joinColumns = @JoinColumn(name = CAMPAIGN_ID))private Set<TripTypeConditionEntity> tripTypeConditions;

Answer 1

我有一些建议:)

• 请注意什么是Persistence Context（EntityManagerJPA 术语中的实例/ SessionHibernate 中的实例）、实体生命周期和事务范围（工作单元）

• 如果您不希望更改反映在数据库中，请不要更改实体状态，或者至少在更改实体之前将其分离。

• readOnly如果您只获取相关工作单元中的数据，请将您的交易标记为“ ”。（请注意，如果您有许多“事务”方法加入同一个物理事务，则该标志由周围的一个设置，并且不能被内部逻辑事务覆盖）。这样EntityManager就不会在事务结束时刷新，挂起的更改也不会持久化到数据库中。

• 您可以使用EntityListener相关实体上的an 跟踪触发意外删除的方法并在方法中打印当前 strackTrace ( new Throwable().printStackTrace()/ log(new Throwable()) PreRemove