@SqlResultSetMapping 实体映射中引用的未知列

Question

我正在尝试使用原生 SQL 查询仅将某些字段映射到实体对象：

@NamedNativeQuery(name = "CustomerEntity.findOnlyNameAndPhoneFromCustomer", query = "select customer_name, customer_email from customer",
        resultSetMapping = "nativeMapping")

@SqlResultSetMappings(value = {
@SqlResultSetMapping(name = "nativeMapping",
entities = {
@EntityResult(
     entityClass = CustomerEntity.class,
     fields = {
     @FieldResult(name = "name", column = "customer_name"),
     @FieldResult(name = "email", column = "customer_email")
     }
)})})
@Entity
class CustomerEntity {
  //getter and setter fields
 @Column(name="customer_name")
 private String name;
 @Column(name="customer_email")
 private String email;
 @Column(name="address")
 private String adddress;
@Id
@GeneratedValue(generator = "uuid2")
@GenericGenerator(name = "uuid2", strategy = "uuid2")
@Access(AccessType.PROPERTY)
@Column(columnDefinition = "VARCHAR(36)", name = "customer_guid")
@Type(type = "uuid-char")
 private UUID guid;
 @Embedded
 private AuditFields audit;
}

存储库：

@Query(nativeQuery = true)
List<CustomerEntity> findOnlyNameAndPhoneFromCustomer();

我不想将customer 表中存在的所有字段都映射到CustomerEntity，我只是投影某些字段。

这给了我这样的错误：

17:44:37.841 [ERROR] o.h.e.j.s.SqlExceptionHelper - The column name address2_6_0_ is not valid.

我的表中没有名为address2_6_0_的列，但是有一个名为address的列，为什么这里要重命名和引用地址列？

我只引用customer_name 和customer_email。

发生了什么事？

谢谢。

Answer 1

entities 用于“映射到实体”。

@EntityResult:

如果使用此注解，SQL 语句应选择映射到实体对象的所有列。

因此，您应该使用classes 和@ConstructorResult 来“映射到DTO”。

@NamedNativeQuery(name = "CustomerEntity.findOnlyNameAndPhoneFromCustomer",
    query = "select customer_name, customer_email from customer",
    resultSetMapping = "nativeMapping")

@SqlResultSetMappings(value = {
    @SqlResultSetMapping(name = "nativeMapping",
        classes = @ConstructorResult(columns = { @ColumnResult(name = "customer_name"), @ColumnResult(name = "customer_email") },
            targetClass = CustomerEntity.class)) })
@Entity
public class CustomerEntity {

    public CustomerEntity() {
    }

    public CustomerEntity(String name, String email) {
        this.name = name;
        this.email = email;
    }
    ...
}