如何在 spring 引导中由 @OneToMany 注释映射的列上使用 JPA findBy

Question

我有这个 model 调用发票，它包含一个@one to many annotation

这是我的 model：

    public class Invoice {
    
        @Id
        @GeneratedValue(strategy= GenerationType.IDENTITY)
        private int id;
        @Column(name = "serial_number")
        private long serialNumber;
        @Column(name = "status")
        private String status;
        @Column(name = "created_date")
        private Timestamp createdDate;
        @Column(name = "is_deleted")
        private boolean isDeleted;
        @ManyToOne
        @JsonIgnore
        @JoinColumn(name = "customer_id")
        private Customer customer;
        @ManyToOne
        @JoinColumn(name = "employee_id")
        private Employee employee;
        @OneToMany(fetch=FetchType.EAGER, mappedBy="invoice")
        private Set <InvoiceHistory> invoiceHistories;
        @OneToMany (mappedBy = "invoice")
        private Set <InvoiceItem> quantity; 
}

如何通过所有具有员工 id = xxxxx 的发票找到？

Answer 1

使用自定义查询获取发票

Query("select x from  Invoice  x  where x.employee.employeeId=:empId")
List<Invoice > getAllInvoicesByEmpId(Long empId) ;

或者，您可以通过基于员工 Model 中的 OneToMany 关系的 id 加载员工来获取属于员工但来自员工本身的所有发票，但这种方式“不推荐”