引起原因：java.sql.SQLSyntaxErrorException：第 1 行“order (id)”附近使用的正确语法的 [...] 版本

Question

此异常与以下内容有关

spring.jpa.hibernate.ddl-auto=update

我还没有尝试保存任何数据

在我看来，映射是正确的，但仍然抛出异常：

org.hibernate.tool.schema.spi.CommandAcceptanceException：通过 JDBC 语句执行 DDL“create table order（id bigint not null auto_increment，order_date date，user_id bigint，primary key（id））engine=MyISAM”时出错

引起原因：java.sql.SQLSyntaxErrorException：您的 SQL 语法有错误；检查与您的 MySQL 服务器版本相对应的手册，了解在第 1 行“order (id)”附近使用的正确语法

我的映射如下所示：

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@MappedSuperclass
public abstract class BaseEntity {

    @Id
    @GeneratedValue(
            strategy = GenerationType.IDENTITY
    )
    private Long id;
}


@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity(name = "Order")
@Table(name = "order")
public class Order extends BaseEntity {

    private LocalDate orderDate;

    @OneToMany(mappedBy = "order", cascade = CascadeType.ALL)
    private List<OrderedTicket> orderedTickets = new ArrayList<>();

    private Long userId;

}


@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Entity(name = "OrderedTicket")
@Table(name = "ordered_ticket")
public class OrderedTicket extends BaseEntity {

    private Integer amount;

    @OneToOne
    @JoinColumn(name="ticket_id")
    private Ticket ticket;

    @ManyToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "order_id")
    private Order order;

}


@Getter
@Setter
@NoArgsConstructor
@Entity(name = "Ticket")
@Table(name = "ticket")
public class Ticket extends BaseEntity {

    @Enumerated(value = EnumType.STRING)
    private TicketType type;
    private Integer price;
    private Integer totalAmmount;
    private Integer inStock;

    @ManyToOne(cascade = {
            CascadeType.DETACH,
            CascadeType.MERGE,
            CascadeType.PERSIST,
            CascadeType.REFRESH
    })
    @JoinColumn(name = "event_id")
    Event event;

    @Builder
    public Ticket(TicketType type, Integer price, Integer totalAmmount, Integer inStock, Event event) {
        this.type = type;
        this.price = price;
        this.totalAmmount = totalAmmount;
        this.inStock = inStock;
        this.event = event;
    }

}

Answer 1

您不应该将表命名为 ORDER，因为 ORDER 是保留的 SQL 关键字。

您可以这样做，但是您始终必须将 ORDER 括在引号中。

请查看 MySQL 手册以了解所有保留关键字：

https://dev.mysql.com/doc/refman/8.0/en/keywords.html

Answer 2

尝试用反引号将订单表名称括起来。否则，引擎将因保留关键字而不断抛出错误：

@Table(name = "`order`")
public class Order extends BaseEntity {