在 Spring boot 中获取值 Joined 2 Table with Getter

Question

尝试从 2 个加入 table 的 getter 中获取价值，有 2 个模型 Customer 和 Address。

@Setter
@Getter
@Data
@Entity
@Accessors(chain = true)
@Table(name = "customer")
public class Customer implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "id", nullable = false)
    private Long id;

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

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

    @Column(name = "address")
    private String address;
}

@Setter
@Getter
@Data
@Entity
@Accessors(chain = true)
@Table(name = "address")
public class Address implements Serializable {

    @Id
    @Column(name = "id", nullable = false)
    private Long id;

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

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

    @Column(name = "number")
    private Integer number;

    @ManyToOne
    @JoinColumn(name="customer")//
    private Customer customerBean;
}

使用此查询的地址存储库：

@Query( value = "SELECT ad FROM Address ad, Customer c WHERE ad.customer = c.id and c.id = 1)
Optional <List<Address>> getAddress();

尝试使用 getter :

Optional<List<Address>> address = getAddress();
System.out.println(address.getAddress()); //success
System.out.println(address.getAddress().get().get(0).getCustomerBean().getName()) //null value

成功从tableAddress获取数据地址，但是如果获取Customer名称获取null值，有什么建议吗？

Answer 1

在您的 @Query 定义中尝试以下内容：

@Query(value = "SELECT ad FROM Address ad JOIN FETCH ad.customer WHERE ad.customer = 1")
Optional <List<Address>> getAddress();

在 Spring boot 中获取值 Joined 2 Table with Getter

Get Value Joined 2 Table with Getter in Spring boot

java

lombok

spring-boot