JPQL

Question

我将 Hibernate OGM 用于 MongoDB，并使用 Map 映射简单的 ShopItem 实体：

@NamedQueries({
        @NamedQuery(name = ShopItem.GET_BY_NAME,
                    query = "select items from ShopItem items where 
                    items.name=:name"),
        @NamedQuery(name = ShopItem.GET_BY_OPTION,
                query = "select items from ShopItem items 
                        join items.options map 
                where ( KEY(map) = :optionKey and map = :optionValue )")
})
@Entity
public class ShopItem {

    public static final String GET_BY_NAME = "ShopItem.getByName";
    public static final String GET_BY_OPTION = "ShopItem.getByOption";

    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    private String id;

    private String name;

    @ElementCollection(fetch = FetchType.EAGER)
    private Map<String, String> options = new HashMap<>();
    //...etc
}

这个贴图不错。我尝试为我的 ShopItemRepository 编写 JPQL 命名查询。我按字段 'name' 搜索了 NamedQuery，它工作正常。但是我需要按 'key' 和 'value' 这两个字段进行搜索，我无法为此编写正确的 JPQL。例如我在数据库中有实体：

{
   "_id":"df111b8a-b831-4200-95b3-f80576cd7273",
   "name":"Example",
   "description":"My description",
   "options":
        {
            "weight":"60 kg",
            "age":"22"
        }
}

我想找到选项具有键 'age' 且值为“22”的所有实体。

我试着写：

select items from ShopItem items join items.options map where ( KEY(map) = :optionKey and map = :optionValue )

或

select items from ShopItem items join items.options map where ( KEY(map) = :optionKey and :optionValue in (VALUE(map))

或

select items from ShopItem items where ( KEY(items.options) = :optionKey and items.options = :optionValue )

或

select items from ShopItem items where ( KEY(items.options) = :optionKey and :optionValue in (VALUE(items.options))

并且有这个错误

org/hibernate/hql/ast/origin/hql/resolve/GeneratedHQLResolver.g: node from line 1:85 no viable alternative at input '('

can't look backwards more than one token in this stream

我在 repo 中的代码：

List<ShopItem> result = entityManager.createNamedQuery(ShopItem.GET_BY_OPTION, ShopItem.class)
                .setParameter("optionKey", key)
                .setParameter("optionValue", value)
                .getResultList();

你能帮我写出正确的 JPQL 查询吗？如果这是不可能的，那么建议如何用另一种方式来做。

我无法使用 Spring 数据 JPA。

Answer 1

目前，查询此案例的唯一方法是使用本机查询：

    List<ShopItem> results = session
            .createNativeQuery( "{ 'options.Weight': '60 Kg' }", ShopItem.class )
            .getResultList();

您仍然可以使用 @NamedNativeQuery（而不是 @NamedQuery）声明查询，但 MongoDB.

不支持参数

JPQL - 我如何搜索键和值的实体 (Hibernate OGM (MongoDB) - Map<String, String>)

JPQL - How can i search entities for key and value (Hibernate OGM (MongoDB) - Map<String, String>)

java

hibernate

mongodb

hibernate-ogm