JPA：與空屬性沒有檢索

Question

實體我有兩個實體：

@Entity 
@Table(name = "T_CLIENT") 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class Client implements Serializable { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long id; 

    @Column(name = "code") 
    private String code; 

    @Column(name = "nom") 
    private String nom; 

    @OneToOne 
    private TypeClient typeClient; 



@Entity 
@Table(name = "T_TYPECLIENT") 
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE) 
public class TypeClient implements Serializable { 

    @Id 
    @GeneratedValue(strategy = GenerationType.AUTO) 
    private Long id; 

    @Column(name = "nom") 
    private String nom; 

我想這樣做，查詢：

@Query("Select id, nom, code, codeComptable, typeClient from Client") 
List<Object[]> findAllWithoutForeignKey(); 

JPA與typeClient <>空只返回客戶端。

如何獲得所有客戶？

謝謝。

Answer 1

這是因爲您的查詢翻譯爲inner join之間Client和TypeClient。試試這個

@Query("Select c.id, c.nom, c.code, c.codeComptable, tc from Client c left join c.typeClient tc") 

Answer 2

的關係Client到TypeClient不OneToOne，而是ManyToOne。嘗試改變它，它可能工作。