[英]save the object using Hibernate object references an unsaved transient instance save the transient instance before flushing
[英]object references an unsaved transient instance - save the transient instance before flushing using hibernate spatial
我正在嘗試執行此查詢:
StringBuffer sb = new StringBuffer();
sb.append("select p from PointsEntity p " + "where within(p.coordinates,:polygon) = true");
但是我有一個例外:
org.hibernate.TransientObjectException:對象引用了一個未保存的瞬態實例-在刷新之前保存該瞬態實例:com.gisapp.springboot.backend.apirest.models.entity.PolygonEntity
這是PolygonEntity:
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "user_id")
private Long userId;
@Column(name = "user_email")
private String userEmail;
@Column(name = "point_name")
private String pointName;
@Column(name = "coordinates")
private Polygon coordinates;
我在這里閱讀了一個可能的解決方案,但觀看該實體,該解決方案已在包含多邊形集合的UserEntity中實現:
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "user_id")
private List<PointsEntity> pointsList;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
@JoinColumn(name = "user_id")
private List<PolygonEntity> polygonsList;
為什么會有這個例外?
最后,我使用了另一種使用內部方法的方法。
我創建了一個時態表和一個實體來保存多邊形,稍后我執行以下查詢:
StringBuffer sb = new StringBuffer();
sb.append("select p from PointsEntity p, TempPolygonEntity t "
+ "where within(p.coordinates, t.coordinates) = true");
使用后將保存該多邊形,以后將其刪除。
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