Java Spring Data OneToMany relationschip 错误

Question

有人能帮忙解答一个问题吗？我已按照文档中的方式制作对象结构，但 relationschip OneToMany 不起作用。

    Order:
    - Positions
    - Partners

    I receiving error:

    SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'order (order_id)' at line 1

订单：

@Getter
@Setter
@Entity
@Table(name = "e_orders")
public class Order {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "order_id")
    private int orderId;

    @Column(unique = true)
    private String orderNumber;
    private int count;

    @OneToMany(mappedBy = "e_orders", fetch = FetchType.LAZY)
    private List<Partner> partners;

    @OneToMany(mappedBy = "e_orders", fetch = FetchType.LAZY)
    private List<Position> positions;
}

合作伙伴：

@Getter
@Setter
@Entity
@Table(name = "e_partner")
public class Partner {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "partner_id")
    private int id;

    private String name;
    private String street;
    private String city;

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "order_e_id")
    private Order attachedOrder;
}

职位：

@Getter
@Setter
@Entity
@Table(name = "e_position")
public class Position {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "position_id")
    private int id;

    private String guid;
    private String posnr;

    @ManyToOne(fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
    @JoinColumn(name = "order_e_id")
    private Order attachedOrder;
}

Answer 1

我认为问题出在您的 mappedBy 值中，因为 mappedBy 的值应该与相应类中的属性名称相同，不像在 @Table 注释中那样。因此，要解决此问题，只需将 mappedBy 形式的 e_orders 中的值更改为 attachedOrder

Java Spring Data OneToMany relationschip 错误

Java Spring Data OneToMany relationschip Error

java

spring

jpa

one-to-many

spring-data