Question

在父实体的非主键上使用@ManyToOne时遇到一个奇怪的问题。当我获取子实体时，hibernate也会获取父实体，即使它被要求懒惰地获取它，我也没有从父实体查询任何内容。

这是我正在使用的示例实体

属性实体是具有列property_id的父实体，它是非主键。

public class Property extends AbstractEntity implements Serializable {

private static final long serialVersionUID = 8412320472079820864L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
Long id;

@Column(name = "property_id")
public Long propertyId;

@NotNull(message = "Name can't be null")
@Size(max = 100)
@Column(name = "name")
public String name;

现在我有一个Room实体，它通过property_id列与Property实体映射。

public class Room extends AbstractEntity implements Serializable {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id")
Long id;

@Column(name = "name")
private String name;

@Column(name = "size")
private String size;

@Column(name = "room_type")
private RoomType roomType = RoomType.STANDARD_ROOM;

@ManyToOne(targetEntity = Property.class, fetch = FetchType.LAZY)
@JoinColumn(name = "property_id", referencedColumnName = "property_id", nullable = false)
private Property property;

@Column(name = "priority")
private Integer priority;

现在，当我获取Room hibernate时，它也会点击数据库来获取属性。

有人可以解释我想念的是什么吗？

我尝试实现拦截器仍然没有运气

@ManyToOne(fetch = FetchType.LAZY,optional = false)
@JoinColumn(name = "property_id", referencedColumnName = "property_id", insertable = false, updatable = false)
@LazyToOne(LazyToOneOption.NO_PROXY)
public Property getProperty() {
    if (interceptor != null) {
        return (Property) interceptor.readObject(this, "property", property);
    }
    return property;
}

public void setProperty(Property property) {
    if (interceptor != null) {
        this.property = (Property)interceptor.writeObject(this, "property", this.property, property);
        return;
    }
    this.property = property;
}

P.s：我也尝试使用@NaturalId注释，但是没有用。

在父实体的非主键上也休眠@ManyToOne

0 个答案: