我有以下实体,item
其中最多可以有两个类别,主要和次要。这两个类别ManyToOne
都category
使用JoinColumnsOrFormulas
. 第一个按预期获取EAGER
,但第二个不会出现在 SQL 语句中并被延迟加载。这种延迟加载会导致经典的 n+1 问题。
这是我的项目实体,其中包含应该加入的两个类别实体:
@Entity
@Table(name = "item", schema = "public", catalog = "stackoverflow_question")
@DynamicUpdate
public class Item extends StackOverflowQuestionEntity {
@Id
@Column(name = "id")
protected Long id;
@Column(name = "site")
private String site;
@ManyToOne
@JoinColumnsOrFormulas({
@JoinColumnOrFormula(formula = @JoinFormula(value = "site", referencedColumnName = "site")),
@JoinColumnOrFormula(formula = @JoinFormula(value = "primary_category_id", referencedColumnName = "category_id"))
})
private Category primaryCategory;
@Column(name = "primary_category_id")
private Long primaryCategoryId;
@ManyToOne
@JoinColumnsOrFormulas({
@JoinColumnOrFormula(formula = @JoinFormula(value = "site", referencedColumnName = "site")),
@JoinColumnOrFormula(formula = @JoinFormula(value = "secondary_category_id", referencedColumnName = "category_id"))
})
private Category secondaryCategory;
@Column(name = "secondary_category_id")
private Long secondaryCategoryId;
}
这是类别实体:
@Entity
@Table(name = "category", schema = "public", catalog = "stackoverflow_question")
public class Category extends StackOverflowQuestionEntity {
@Column(name = "category_id")
private Long categoryId;
@Column(name = "name")
private String name;
@Column(name = "site")
private String site;
}
结果查询仅包含主要类别:
SELECT this_.id AS id1_9_9_,
this_.inserted AS inserted2_9_9_,
this_.updated AS updated3_9_9_,
this_.primary_category_id AS formula174_9_,
this_.secondary_category_id AS formula176_9_,
category2_.id AS id1_0_0_,
category2_.inserted AS inserted2_0_0_,
category2_.updated AS updated3_0_0_,
category2_.name AS name7_0_0_
FROM public.item this_
LEFT OUTER JOIN public.category category2_ ON this_.site=category2_.site
AND this_.primary_category_id=category2_.category_id
WHERE True;
因此,次要类别变得懒惰:
SELECT category0_.id AS id1_0_0_,
category0_.inserted AS inserted2_0_0_,
category0_.updated AS updated3_0_0_,
category0_.name AS name4_0_0_,
category0_.site AS site5_0_0_
FROM public.category category0_
WHERE category0_.site=?
AND category0_.category_id=?;
为什么 Hibernate 加入次要类别懒惰,注解似乎是一样的。
我使用的休眠版本是 5.0.10.Final。
这是基本实体的样子:
@MappedSuperclass
abstract public class StackOverflowQuestionEntity implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", unique = true, insertable = true, updatable = false, nullable = false)
protected Long id;
@Type(type="LocalDateTime")
@Column(name = "created", nullable = false, insertable = true, updatable = false)
protected LocalDateTime created;
@Type(type="LocalDateTime")
@Column(name = "refreshed", nullable = false, insertable = true, updatable = true)
protected LocalDateTime refreshed;
@PreUpdate
protected void onUpdate() {
refreshed = now();
}
@PrePersist
protected void onCreate() {
created = refreshed = now();
}
}
这是一个示例“查询”,正如我所说我使用的是休眠标准和 HQL,这两种方法都会出现问题。
session
.createCriteria(Item.class)
.add(eq("id", id))
.uniqueResult();