java Hibernate将多个列映射到一个表

Question

如何配置映射？我想表“汇款”是指表“费用”的两列

汇款

@Entity
@Table(name = "REMITTANCE")
public class Remittance implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "REMITTANCE_ID")
    private Long id;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "remittances", cascade =    CascadeType.ALL)
    private Expense from;

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "remittances", cascade = CascadeType.ALL)
    private Expense to;
}

费用

@Entity
@Table(name = "EXPENSE")
public class Expense implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "EXPENSE_ID")
    private Long id;

    @ManyToOne(optional = false)
    @JoinColumn(name = "REMITTANCE_ID")
    private Remittance remittances;
}

Answer 1

我犯了一个错误。我已经改正了

汇款

@Entity
@Table(name = "REMITTANCE")
public class Remittance implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "REMITTANCE_ID")
    private Long id;

    @ManyToOne(optional = false)
    @JoinColumn(name = "EXPENSE_ID")
    private Expense from;

    @ManyToOne(optional = false)
    @JoinColumn(name = "EXPENSE_ID")
    private Expense to;
}

费用

@Entity
@Table(name = "EXPENSE")
public class Expense implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "EXPENSE_ID")
    private Long id;
}

但是现在我们出去了

原因：org。冬眠MappingException:实体ru的映射中重复列。制作亚历克斯。网状物模型收入汇款列：费用\u ID（应使用insert=“false”update=“false”进行映射）