我有以下具有 @OneToMany
关系的类,但它只返回两行之一:
@Entity
@javax.persistence.Table(name = "as_itm_ext")
public class ItemExtensionEntity implements java.io.Serializable {
@OneToMany(fetch = FetchType.EAGER, cascade = { CascadeType.ALL })
@JoinColumns({ @JoinColumn(name = "id_itm", referencedColumnName = "id_itm", insertable = false, updatable = false) })
public Set<ItemAttributeEntity> getItemAttributeEntities() {
return this.itemAttributeEntities;
}
public void setItemAttributeEntities(Set<ItemAttributeEntity> itemAttributeEntities) {
this.itemAttributeEntities = itemAttributeEntities;
}
}
以及要检索的类:
@Entity
@javax.persistence.Table(name = "as_itm_att")
public class ItemAttributeEntity implements java.io.Serializable {
private static final long serialVersionUID = 1L;
/**
* AttributeKey,The key of the attribute.
*/
private ItemAttributeEntityId id;
/**
* AttributeValue,The value of the attribute.
*/
private String attributeValue;
public ItemAttributeEntity() {
}
public ItemAttributeEntity(ItemAttributeEntityId id, String attributeValue) {
this.id = id;
this.attributeValue = attributeValue;
}
/**
* AttributeKey,The key of the attribute.
*/
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name = "itemId", column = @Column(name = "id_itm", nullable = false, length = 32)),
@AttributeOverride(name = "attributeKey", column = @Column(name = "att_key", nullable = false, length = 32)) })
public ItemAttributeEntityId getId() {
return this.id;
}
public void setId(ItemAttributeEntityId id) {
this.id = id;
}
/**
* AttributeValue,The value of the attribute.
*/
@Column(name = "att_value", nullable = false, length = 32)
public String getAttributeValue() {
return this.attributeValue;
}
public void setAttributeValue(String attributeValue) {
this.attributeValue = attributeValue;
}
}
我已经尝试将 Set
更改为 List
但没有成功(在阅读了一些关于它们之间的差异后,更改它是没有意义的)。
我不知道发生了什么,也不确定它是否总是这样。
谢谢!
更新:尝试实现等于
,但什么也没发生。
最佳答案
尝试在 itemAttributeEntities 上使用 fetch = FetchType.LAZY。
关于java - Hibernate - OneToMany 仅检索一行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48100578/