java - 使用 JPA 和 Hibernate 的复合键
问题描述
在这段代码中,我正在尝试使用该模型类生成一个复合键,但是当我执行 post 方法时会引发异常。
我正在使用 postgres 作为数据库。然后我需要休眠自动生成“RA”和Idprojeto。
型号 ID 类
@Data
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@AllArgsConstructor
@NoArgsConstructor
class ProjetoId implements Serializable{
Long idProjeto;
Long ra;
}
模型实体
@Entity
@Data
@IdClass(ProjetoId.class)
@EqualsAndHashCode(onlyExplicitlyIncluded = true)
@Table(name = "projeto", schema = "public")
public class Projeto {
@EqualsAndHashCode.Include
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id_projeto")
private Long idProjeto;
@Valid
@ConvertGroup(from = Default.class, to = ValidationGroups.ClienteId.class)
@NotNull
@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "id_cliente")
private Cliente cliente;
@Valid
@NotNull
@ElementCollection
private List<ProdutoToProjeto> produtos = new ArrayList<>();
@EqualsAndHashCode.Include
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "ra")
private Long ra;
@JsonProperty(access = JsonProperty.Access.READ_ONLY)
@Enumerated(EnumType.STRING)
@Column(name = "situacao")
private StatusProjeto situacao;
@JsonProperty(access = JsonProperty.Access.READ_ONLY)
@Column(name = "data_criacao")
private LocalDate dataRegistro;
public void finalizar() {
if(naoPodeSerFinalizado()) {
throw new ProjetoException("Projeto não pode ser finalizado");
}
setSituacao(StatusProjeto.APROVADO);
}
public void cancelar() {
if(naoPodeSerFinalizado()) {
throw new ProjetoException("Projeto não pode ser cancelado");
}
setSituacao(StatusProjeto.RECUSADO);
}
public boolean podeSerFinalizado() {
return StatusProjeto.PEDENTE.equals(getSituacao());
}
public boolean naoPodeSerFinalizado() {
return !podeSerFinalizado();
}
}
错误
java.lang.IllegalArgumentException: Can not set java.lang.Long field com.ciasense.apiciasense.model.ProjetoId.ra to org.hibernate.id.IdentifierGeneratorHelper$2
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) ~[na:na]
at java.base/jdk.internal.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) ~[na:na]
at java.base/jdk.internal.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81) ~[na:na]
at java.base/java.lang.reflect.Field.set(Field.java:778) ~[na:na]
解决方案
如果仅使用 DB SEQUENCE 作为自动生成类型,则复合键可以工作。否则,您必须编写自定义键生成器并在插入之前为复合键的两个字段分配值。
@EqualsAndHashCode.Include
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "id_projeto")
private Long idProjeto;
@EqualsAndHashCode.Include
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE)
@Column(name = "ra")
private Long ra;
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