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[英]Hibernate/Spring Data not fetching collection in OneToMany mapping
[英]HIbernate ignore fetching data from OnetoMany field
我想忽略實體中的@OnetoMany
字段。 獲取數據需要獲取實際字段但不想觸發對依賴表的查詢。 但是從父表中刪除數據需要從依賴表中刪除
我試過忽略但刪除也被忽略的@Transient
。 當我調用父實體時,還有其他選項可以告訴 JPA 不要從子表中獲取數據嗎?
@Entity
Table(name = "User")
public class UserEntity implements Serializable {
@Id
@Column(name = "id")
private int id;
@Column(name = "SERIAL", unique = true, nullable = false)
private String serial;
@OneToMany(mappedBy = "serialBySerialId", cascade = CascadeType.ALL)
private Set<UserActionEntity> userActionsById;
}
@Table(name = "user_action")
public class UserActionEntity implements Serializable {
@Id
@Column(name = "id")
private int id;
@Column(name = "action")
private String action;
@ManyToOne
@JoinColumn(name = "USER_ID", referencedColumnName = "ID", nullable = false)
private UserEntity userByUserId;
如果您不想觸發對依賴表的查詢,您可以在 UserActionEntity 屬性上使用 (fetch = FetchType.LAZY)。
@OneToMany(mappedBy = "serialBySerialId", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
private Set<UserActionEntity> userActionsById;
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