如何订购查询hibernate标准的集合

Question

这是我的模型（简化）

产品

@Entity
@Table(name = "products")
public class Product extends BaseEntity {

@Id     
private Long id;

private String name;
@OneToMany(cascade = { CascadeType.PERSIST, CascadeType.MERGE })
@JoinColumn(name = "product_id")
private List<ProductAttribute> attributes;

}

产品属性

@Entity
@Table(name = "product_attribute_values")
public class ProductAttribute extends BaseEntity {

    @Id
    private Long id;

    @ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    @JoinColumn(name = "product_id")
    private Product product;

    @ManyToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
    @JoinColumn(name = "attribute_id")
    private Attribute attribute;
    private String value;

}

属性

@Entity
@Table(name = "attributes")
@Proxy(lazy = false)
public class Attribute extends BaseEntity {

    @Id
    private Long id;
    private String name;

}

我想查询单个产品（按ID）并按属性名称排序属性（ProductAttributes）列表。

这是我的查询

final Criteria criteria = getSession().createCriteria(Product.class);
criteria.add(Restrictions.eq("id", productId));
Criteria crit = criteria.createCriteria("attributes");
Criteria secondCriteria = crit.createCriteria("attribute");
secondCriteria.addOrder(Order.desc("name"));
return (Product) criteria.uniqueResult();

我也尝试了这个，但它没有用（不识别名字字段）

final Criteria criteria = getSession().createCriteria(Product.class);
criteria.add(Restrictions.eq("id", productId));
criteria.createAlias("attributes", "atr");
criteria.addOrder(Order.asc("atr.attribute.name"));

有什么想法吗？

Answer 1

我做到了。只需创建一个别名并在两个

中指定连接类型

final Criteria criteria = getSession().createCriteria(Product.class);
criteria.add(Restrictions.eq("id", searchFilter.getProductId()));
criteria.createAlias("attributes", "atrs", CriteriaSpecification.LEFT_JOIN);
criteria.createAlias("atrs.attribute", "atr", CriteriaSpecification.LEFT_JOIN);
criteria.addOrder(Order.asc("atr.name"));