Java 使用@OrderBy时JPA@ManyToMany排序失败
当JPA尝试选择AdmUser实体时,我有sql错误:Java 使用@OrderBy时JPA@ManyToMany排序失败,java,hibernate,jpa,Java,Hibernate,Jpa,当JPA尝试选择AdmUser实体时,我有sql错误: ERROR: column locations1_.name does not exist. 我的实体有什么问题吗?我的AdmUser实体: @Entity @Table(name = "ADM_USERS") @SequenceGenerator(name = "ADM_USER_SEQ", sequenceName = "ADM_USER_SEQ", allocationSize = 1) public class AdmUser
ERROR: column locations1_.name does not exist.
我的实体有什么问题吗?我的AdmUser实体:
@Entity
@Table(name = "ADM_USERS")
@SequenceGenerator(name = "ADM_USER_SEQ", sequenceName = "ADM_USER_SEQ", allocationSize = 1)
public class AdmUser implements EntityInt, Serializable {
private static final long serialVersionUID = 786L;
@Id
@Column(nullable = false)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "ADM_USER_SEQ")
private Long id;
(...)
@ManyToMany(cascade = CascadeType.MERGE, fetch = FetchType.EAGER)
@JoinTable(name = "loc_locations_adm_users", joinColumns = @JoinColumn(name = "id_user", referencedColumnName="id"),
inverseJoinColumns = @JoinColumn(name = "id_location"))
@OrderBy("name")
private Set<LocLocation> locations;
(...)
}
排序依据指向
locations1.name
,但应为loclocation2.name
。我的实体有什么问题吗?在该字段的一侧有一个集合。因此,没有“排序”(除了hashCode()GVE之外)。如果您想要排序,请使用列表(这是Java,实际上与JPA无关)
在M-N的非所有者侧,您似乎也缺少了一个“mappedBy”。
@OrderBy
可以很好地与许多人配合使用。还有我在问题中提供的结构。问题是我的查询,JPA没有处理它。对不起。不是真的,因为在其他地方我已经设置和订购工作正常。这个问题是由JPA查询产生的,即使我尝试在SQL编辑器中执行这个查询,我也会遇到相同的错误:错误:column locations1_u2;name不存在,我知道简单哈希集没有顺序。所以,我想知道为什么在其他情况下,它是正确的排序。无论如何,即使更改为列表-错误也是一样的。请注意我对答案的更新。。。mappedBy失踪了?此外,当连接表是M-N时,您只需要从一侧定义连接表。这是不正确的。Hibernate将在需要时使用SortedSet实现。在双向M-N关系上需要一个mappedBy。不知道这意味着什么“问题是我的查询”。您未在问题中提供查询。我未提供查询,因为查询未指向AdmUser实体。JPA在选择连接数据时动态加载了它。我后来注意到,在直接选择AdmUser时,OrderBy可以正常工作。很抱歉
@Entity
@Table(name = "loc_locations", schema = "public")
@SequenceGenerator(name = "LOC_LOCATIONS_SEQ", sequenceName = "LOC_LOCATIONS_SEQ", allocationSize = 1)
public class LocLocation implements EntityInt, java.io.Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "id", unique = true, nullable = false)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "LOC_LOCATIONS_SEQ")
private Long id;
@Column(nullable = false, unique = true, length = 200)
private String name;
(...)
@ManyToMany(cascade = CascadeType.REFRESH, fetch = FetchType.LAZY, mappedBy="locations")
private List<AdmUser> users;
}
select
admuser0_.id as id1_2_0_,
admuser0_.actived as actived2_2_0_,
admuser0_.admin as admin3_2_0_,
admuser0_.allow_ip as allow_ip4_2_0_,
admuser0_.created as created5_2_0_,
admuser0_.deleted as deleted6_2_0_,
admuser0_.id_domain as id_doma16_2_0_,
admuser0_.email as email7_2_0_,
admuser0_.language as language8_2_0_,
admuser0_.login as login9_2_0_,
admuser0_.name as name10_2_0_,
admuser0_.passwd as passwd11_2_0_,
admuser0_.phone as phone12_2_0_,
admuser0_.picture as picture13_2_0_,
admuser0_.surname as surname14_2_0_,
admuser0_.theme as theme15_2_0_,
locations1_.id_user as id_user1_2_1_,
loclocatio2_.id as id_locat2_6_1_,
loclocatio2_.id as id1_17_2_,
loclocatio2_.description as descript2_17_2_,
loclocatio2_.name as name3_17_2_
from
public.ADM_USERS admuser0_
left outer join
public.loc_locations_adm_users locations1_
on admuser0_.id=locations1_.id_user
left outer join
public.loc_locations loclocatio2_
on locations1_.id_location=loclocatio2_.id
where
admuser0_.id=1
order by
locations1_.name