无法映射实体。获取一个实体给第一个实体列中的第二个实体的列

Question

我想要使用Hibernate和JPA获取实体。但是获取一个实体会尝试在第一个实体中查找第二个实体的列。这里是代码：

我有两个实体：

Entity1.java

@Id 
@Column(name = "WRITE_PROTECTION_ID") 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = FrontendDBTableSequenceNm.WRITE_PROTECTION_ID_SEQ) 
@SequenceGenerator(name = FrontendDBTableSequenceNm.WRITE_PROTECTION_ID_SEQ, 
sequenceName = FrontendDBTableSequenceNm.WRITE_PROTECTION_ID_SEQ, allocationSize = 1) 
private Long id; 

/** The division. */ 
@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "DIVISION_ID") 
private Entity2 entity2; 

Entity2.java

@Id 
@Column(name = "DIVISION_ID") 
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = FrontendDBTableSequenceNm.DIVISION_ID_SEQ) 
@SequenceGenerator(name = FrontendDBTableSequenceNm.DIVISION_ID_SEQ, 
sequenceName = FrontendDBTableSequenceNm.DIVISION_ID_SEQ, allocationSize = 1) 
private Long id; 

/** The name. */ 
@Column(name = "DIVISION_NM") 
@ChangeLog 
private String name; 

/** The sort order. */ 
@Column(name = "SORT_ORDER") 
@ChangeLog 
private Integer sortOrder; 

/** The markets. */ 
@OneToMany(mappedBy = "division") 
private Set<Market> markets; 

/** The company. */ 
@ManyToOne(fetch = FetchType.LAZY) 
@JoinColumn(name = "CMPNY_ID") 
private Company company; 

现在，当我尝试使用存储库来获取实体之一：

@Query("from Entity1 wp order by wp.entity2.name") 
List<WriteProtection> findAllOrderByDivision(); 

命中的数据库查询是：

select entity0_.ENTITY_1_ID as WRITE1_20_, 
entity0_.CREATE_BY as CREATE2_20_, 
entity0_.CREATE_TMS as CREATE3_20_, 
entity0_.UPD_BY as UPD4_20_, 
entity0_.UPD_TMS as UPD5_20_, 
entity0_.ENTITY2_ID as ENTITY27_20_, 
entity0_.TREE_LEVEL as TREE6_20_ 
from rmc_dev_rel3.ENTITY_1 entity0_, rmc_dev_rel3.ENTITY2 ENTITY21_ 
where entity0_.ENTITY2_ID=ENTITY21_.ENTITY2_ID order by ENTITY21_.ENTITY2_NM; 

所以基本上它是什么做的是它试图找到第一实体的第二实体的列。由于在这里的列“CREATE_BY”，“CREATE_TMS”，“UPD_BY”和“UPD_TMS”是entity2中的列，但查询正试图从entity1中获取它。

Answer 1

更改查询到以下解决我的问题：

@Query("select wp.id, wp.entity2, wp.treeLevel from Entity1 wp order by wp.entity2.name")