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java - Java Spring Data OneToMany 关系芯片错误

问题描述

有人可以帮忙解决一个问题。我在文档中制作了对象结构，但关系芯片 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

命令：

@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;
}

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;
}

位置：

@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;
}

标签： javaspringjpaspring-dataone-to-many

解决方案

我相信问题出在您的mappedBy值中，因为 的值mappedBy应该与相应类中的属性名称相同，而不是@Table注释中的值。所以要解决这个问题，只需将mappedBy表单中的值更改e_orders为attachedOrder

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