java - JPQL:编译错误 - 状态字段 'e.e2.e3' 无法解析为有效类型

Question

我遇到了无法解决的错误。

Exception Description: Problem compiling [SELECT e FROM ResourceGroup e WHERE e.aclUserResourceGroups.userGroup=:userGroup AND e.aclUserResourceGroups.canView=:canView]. 
[36, 69] The state field path 'e.aclUserResourceGroups.userGroup' cannot be resolved to a valid type.
[87, 118] The state field path 'e.aclUserResourceGroups.canView' cannot be resolved to a valid type.

命名查询:

 SELECT e 
 FROM ResourceGroup e 
 WHERE e.aclUserResourceGroups.userGroup=:userGroup 
 AND e.aclUserResourceGroups.canView=:canView

ERD:

实体:

@Entity
@Table(name="resource_group")
public class ResourceGroup  implements Serializable{

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int id;

    @Column(unique=true)
    private String name;

    @OneToMany(mappedBy = "resourceGroup", cascade = CascadeType.ALL, fetch=FetchType.LAZY, orphanRemoval=true)
    @JoinColumn(name = "resourcegroup_id")
    private List<UserGroupResourceGroup> aclUserResourceGroups;
}

加入实体:

@Entity
@Table(name="user_group_resource_group")
public class UserGroupResourceGroup implements Serializable{

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int id;

    @ManyToOne(targetEntity = UserGroup.class, cascade = CascadeType.PERSIST, fetch=FetchType.LAZY)
    @JoinColumn(name="usergroup_id")
    private UserGroup userGroup = new UserGroup();

    @ManyToOne(targetEntity = ResourceGroup.class, cascade = CascadeType.PERSIST, fetch=FetchType.LAZY)
    @JoinColumn(name="resourcegroup_id")
    private ResourceGroup resourceGroup = new ResourceGroup()
}

用户组:

@Entity
@Table(name="user_group")
public class UserGroup implements Serializable{


    @OneToMany(mappedBy="userGroup", fetch=FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "usergroup_id") 
    private List<AccessControlList> acl;

    @OneToMany(mappedBy="userGroup", fetch=FetchType.LAZY, cascade = CascadeType.ALL)
    @JoinColumn(name = "usergroup_id") 
    private List<UserGroupResourceGroup> aclUserResourceGroups;
}

DAO:

@Override
public List<ResourceGroup> getAllowedResourceGroups(UserGroup userGrp){

     return this.em.createNamedQuery("ResourceGroup.getAllCanView")
                .setParameter("userGroup", userGrp)
                .setParameter("canView", true)
                .getResultList();

}

Answer 1

e.aclUserResourceGroups 是一个集合，您无法以这种方式访问​​它。

未测试，但尝试使用以下内容:

SELECT e 
FROM ResourceGroup e 
inner join e.aclUserResourceGroups acl
WHERE acl.userGroup=:userGroup 
AND acl.canView=:canView

希望这有帮助!