java - JPA实体怎么做

Question

我有那些实体 当我持久化 LotPaiement 实体时，我希望使用 LotPaiement id 更新 PaiementId 的 idLot 。这可能吗？我尝试使用 JoinColomn 和其他东西，但它不起作用。我希望有人有其他想法......

    @Entity
    @Table(name = "XX", schema = "X")
    public class LotPaiement implements Serializable {

    @Transient
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ID_LOT_PAIE_EXT", insertable = false)
    private int id;

    @Column(name = "NO_ORGA", nullable = false, length = 10)
    private String noOrganisme;

    @Column(name = "NO_FICH_BANQ", nullable = false, length = 10)
    private String noFichierBanque;

    @Column(name = "NOM_FICH_BANQ" ,nullable = false, length = 60 )
    private String nomFichierBanque;

    @Column(name = "DAT_PROD", nullable = false, length = 10)
    private Date dateProdBanque;

    @Column(name = "IND_ENCAI", nullable = false, length = 1)
    @Convert(converter = CodeChoixJpaConverter.class)
    private CodeChoix encaissee = CodeChoix.NON;

    @Column(name = "COD_PROVEN", nullable = false, length = 1)
    private String codeProvenance;

    @Column(name = "NB_PAIE", nullable = false)
    private int nombrePaiements;

    @Column(name = "MONT_LOT_PAIE", nullable = false, precision = 12)
    private BigDecimal montantPaiements;

    @Column(name = "MONT_FRAIS_LOT_PAIE", nullable = false, precision = 12)
    private BigDecimal montantFraisPaiements;

    @Column(name = "NB_CORR", nullable = false)
    private int nombreCorrections;

    @Column(name = "MONT_CORR", nullable = false, precision = 12)
    private BigDecimal montantCorrections;

    @Column(name = "MONT_FRAIS_CORR", nullable = false, precision = 12)
    private BigDecimal montantFraisCorrections;

    @Column(name = "NO_USAG_CREA", length = 8)
    private String noUsagerCreation;

    @Column(name = "DAT_HRE_CREA", nullable = false, length = 26, insertable = false)
    private Date dateHeureCreation;

    @Column(name = "NO_USAG_MODIF", length = 8)
    private String noUsagerModif;

    @Column(name = "DAT_HRE_MODIF", nullable = false, length = 26, insertable = false)
    private Date dateHeureModif;

    @OneToMany(targetEntity = Paiement.class, mappedBy = "id.idLot", cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<Paiement> paiements = new ArrayList<Paiement>();

还有这个

@Entity
@Table(name = "F_PAIEMENT_EXT" , schema = "PAX")
public class Paiement  implements Serializable {

    @Transient
    private static final long serialVersionUID = 973636294796000052L;

    @EmbeddedId
    private PaiementId id;

    @Column(name = "COD_TYP_TRANS", nullable = false, length = 1)
    @Convert(converter = TypeTransactionJpaConverter.class)
    private TypeTransaction codeTypeTransaction;

    @Column(name = "NOM_PAYEUR", nullable = false, length = 50)
    private String nomPayeur;

    @Column(name = "REFERENCE_1", nullable = false, length = 50)
    private String reference1;

    @Column(name = "REFERENCE_2", length = 50)
    private String reference2;

    @Column(name = "MONT_PAIE", nullable = false, precision = 10)
    private BigDecimal montantPaiement;

    @Column(name = "MONT_FRAIS_PAIE", nullable = false, precision = 5)
    private BigDecimal montantFrais;

    @Column(name = "COD_TYP_ORIG", length = 1)
    @Convert(converter = TypeOrigineJpaConverter.class)
    private TypeOrigine codeTypeOrigine;

    @Column(name = "NO_INST_FINA", nullable = false, length = 5)
    private String noInstitutionFinanciere;

    @Column(name = "NO_TRANSIT_INST", nullable = false, length = 5)
    private String noTransitInstitution;

    @Column(name = "NO_CENTRE_SERV", nullable = false, length = 2)
    private String noCentreService;

    @Column(name = "DAT_PAIE", nullable = false, length = 10)
    private Date datePaiement;

    @Column(name = "NO_USAG_CREA", length = 8)
    private String noUsagerCreation;

    @Column(name = "DAT_HRE_CREA", nullable = false, length = 26, insertable = false)
    private Date dateHeureCreation;

    @Column(name = "NO_USAG_MODIF", length = 8)
    private String noUsagerModif;

    @Column(name = "DAT_HRE_MODIF", nullable = false, length = 26, insertable = false)
    private Date dateHeureModif;

这是可嵌入类

@Embeddable
public class PaiementId implements Serializable {

    @Transient
    private static final long serialVersionUID = -4993016053388314553L;

    @Column(name = "ID_LOT_PAIE_EXT")
    private int idLot;

    @Column(name = "NO_LIGNE", nullable = false)
    private int noLigne;

Answer 1

您的帖子被标记为“JPA”，因此您正在使用对象关系映射框架，其目的恰恰是帮助您摆脱愚蠢的 id 并将其替换为实际引用对象。

因此，您的字段不应该是 private int idLot;

应该是private LotPaiement lotPaiament;

当然，映射将不起作用，您需要按如下方式修复它:

@OneToMany(targetEntity = Paiement.class, mappedBy = "lotPaiament", 
    cascade = CascadeType.ALL, fetch = FetchType.EAGER)
private List<Paiement> paiements = new ArrayList<Paiement>();