Question

我正在使用mongodb，jpa和hibernate ogm，我遇到了查询问题。我有两个实体：User和Entitlement，它们之间具有单向ManyToMany关联，因此Entitlement包含User列表。我正在尝试获取其用户字段包含特定用户的所有权利。

@Entity
public class User {
@Id
private String id;

private String name;

private String surname;
//getters and setters...
}

@Entity
public class Entitlement {

@Id
private String id;

@ManyToMany(fetch = FetchType.EAGER, cascade = { CascadeType.PERSIST,
        CascadeType.MERGE, CascadeType.REFRESH, CascadeType.DETACH })
private Set<User> users = new HashSet<User>();

private String name;

//getters and setters...
}

我将hibernate配置为将关联信息存储在每个关联的专用文档中。以下是persistence.xml文件

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
         version="2.0">

<persistence-unit name="org.hibernate.ogm.tutorial.jpa" transaction-type="JTA">
    <!-- Use Hibernate OGM provider: configuration will be transparent -->
    <provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>

    <class>com.example.mongodb.model.User</class>
    <class>com.example.mongodb.model.Entitlement</class>

    <properties>
        <property name="hibernate.transaction.jta.platform"
                  value="org.hibernate.service.jta.platform.internal.JBossStandAloneJtaPlatform" />
        <property name="hibernate.ogm.datastore.provider" value="mongodb" />
        <property name="hibernate.ogm.datastore.host" value="localhost"/>
        <property name="hibernate.ogm.datastore.database" value="mydb"/>
        <property name="hibernate.ogm.datastore.create_database" value="true"/>
        <property name="hibernate.ogm.datastore.document.association_storage" value="ASSOCIATION_DOCUMENT"/>
    </properties>
</persistence-unit>

我的目标是获取“用户”字段包含特定用户的所有权利。我尝试了以下查询：

此查询返回db中存在的所有权利，不带任何过滤器

User u = em.find(User.class, id);//id is the user id that I use to find the entitlements

List<Entitlement> list = em
        .createQuery(
                "select e from Entitlement e fetch all properties where :user MEMBER OF e.users",
                Entitlement.class).setParameter("user", u)
        .getResultList();
return list;

2

User u = em.find(User.class, id);

HashSet<User> userSet = new HashSet<User>();
userSet.add(u);
List<Entitlement> list = em
        .createQuery(
                "select e from Entitlement e fetch all properties where e.users In (:user)",
                Entitlement.class).setParameter("user", userSet)
        .getResultList();
return list;

使用此查询，我收到以下错误：

java.lang.UnsupportedOperationException：无法对集合执行事后查询完成查找。

3

  List<Entitlement> list = em
        .createQuery(
                "select e from Entitlement e inner join fetch e.users u where u.id IN (:id) ",
                Entitlement.class)
        .setParameter("id", Arrays.asList(id)).getResultList();

return list;

此查询产生此错误：

java.lang.UnsupportedOperationException：无法识别的属性类型：org.hibernate.type.SetType（com.example.mongodb.model.Entitlement.users）

这些都不起作用。

JPQL - 查询manytomany关联（mongodb + jpa + hibernate）

0 个答案: