Spring boot 如何从使用@JoinTable的@OneToOne迁移到只使用@OneToOne？

我们正在重组我们的服务和数据。我们有两个实体

Employee

，

CostCenter

@Entity
@Table(name = "employees")
data class Employee(
    @Id
    val id: Long? = null,

    @Column(name = "id_dept")
    val departmentId: Long,

    @Column(name = "business_email_address")
    var businessEmailAddress: String? = null,

    @OneToOne
    @JoinTable(
        name = "employee_cost_centers",
        joinColumns = [JoinColumn(
            name = "employee_id",
            referencedColumnName = "id"
        )]
    )
    @JoinColumn(name = "cost_center_id")
    var costCenter: CostCenter? = null
)

员工表

| id | id_dept     | business_email_address |
|----|-------------|------------------------|
| 1  | Finance     | finance@example.com    |
| 2  | HR          | hr@example.com         |
| 3  | Development | dev@example.com        |
| 4  | Marketing   | marketing@example.com  |

成本中心表

| id  | name                  | deleted |
|-----|-----------------------|---------|
| 10  | FinanceCostCenter     | false   |
| 20  | HRCostCenter          | false   |
| 30  | DevelopmentCostCenter | false   |
| 40  | MarketingCostCenter   | false   |

| cost_center_id | employee_id |
|----------------|-------------|
| 10             | 1           |
| 20             | 2           |
| 30             | 3           |
| 40             | 4           |

当我们在

Employee

实体中使用

@JoinTable

时，我们有一个第三个表，它通过名称

Employee\u cost\u centers

在员工和成本中心之间进行映射。 员工成本中心表

| id  | name                  | deleted |
|-----|-----------------------|---------|
| 10  | FinanceCostCenter     | false   |
| 20  | HRCostCenter          | false   |
| 30  | DevelopmentCostCenter | false   |
| 40  | MarketingCostCenter   | false   |

| cost_center_id | employee_id |
|----------------|-------------|
| 10             | 1           |
| 20             | 2           |
| 30             | 3           |
| 40             | 4           |

现在我们想把成本中心转移到它自己的微服务上。因此，

cost\u centers

表也将移动到新服务。 我想通过创建一个新实体，将

Employee

表中的

costCenter

引用直接映射到第三个映射表

Employee\u cost\u centers

@Entity
@Table(name = "employee_cost_centers")
data class EmployeeCostCenter(
    @Id
    @Column(name="cost_center_id")
    val costCenterid: Long,

    @Column(name="employee_id")
    val employeeId: Long
)

但我应该如何在

Employee

实体中映射它呢？ 我对JPA/Hibernate相当陌生。非常感谢专家的任何帮助。

替换

@OneToOne
    @JoinTable(
        name = "employee_cost_centers",
        joinColumns = [JoinColumn(
            name = "employee_id",
            referencedColumnName = "id"
        )]
    )
    @JoinColumn(name = "cost_center_id")
    var costCenter: CostCenter? = null

借

或者，根据您的设计，可以保持变量名称不变