“错误：您的SQL语法中有错误;”在hibernate中一对多的关系映射

Question

我正在尝试通过hibernate实现订单管理系统，我不是很熟悉。异常要求我在我的程序尝试中手动执行sql和hibernate一样，并且成功了。我不知道是什么问题。可能是设计问题。数据库是这样的：

ORDER在ITEM表中有一个指向ITEM_ID的外键ITEM_ID，它是一对多的关系，另一个外键CLIENT_ID指向CLINET表中的CLIENT_ID。 带有注释的三个实体定义写为

@Table(name = "ITEM")
public class Item implements Serializable{
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "ITEM_ID", unique = true, nullable = false)
    private int item_id;
    @Column(name = "NAME")
    private String name;
    @Column(name="CATEGORY")
    private String category;
    @Column(name="UNIT")
    private String unit;
    @Column(name="PRICE")
    private double price;
    //getters and setters
}

@Entity
@Table(name="CLIENT")
public class Client implements Serializable{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "CLIENT_ID", unique = true, nullable = false)
    private int client_id;
    @Column(name="CLIENT_NAME")
    private String client_name;
//getters and setters
}

@Entity
@Table(name="ORDER")
public class Order {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "ORDER_ID", unique = true, nullable = false)
    private int order_id;
    @ManyToOne(cascade = CascadeType.PERSIST,targetEntity=Client.class)
    @JoinColumn(name = "CLIENT_ID", nullable = false)
    private Client client;
    @ManyToOne(cascade = CascadeType.PERSIST,targetEntity=Item.class)
    @JoinColumn(name = "ITEM_ID", nullable = false)
    private Item item;
    @Column(name="QUANTITY")
    private double quantity;
    @Temporal(TemporalType.DATE)
    @Column(name = "ORDER_DATE")
    private Date order_date;
//getters and setters
    }

订单数据插入功能如下：

public static void insertNewOrder(Item item,Client client, double quantity, Date date){
        Session session = HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        Order order = new Order();
        order.setItem(item);
        order.setClient(client);
        order.setQuantity(new Double(quantity));
        order.setOrder_date(date);
        session.save(order);
        session.getTransaction().commit();
        session.close();
    }

这是我的例外：

ERROR: 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 (CLIENT_ID, ITEM_ID, ORDER_DATE, QUANTITY) values (1, 1, '2013-11-12', 1.4' at line 1
Exception in thread "main" org.hibernate.exception.SQLGrammarException: 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 (CLIENT_ID, ITEM_ID, ORDER_DATE, QUANTITY) values (1, 1, '2013-11-12', 1.4' at line 1

我手动尝试过这个sql，并且确实成功插入了。我找不到问题所在的任何线索。请帮忙。

Answer 1

ORDER是一个MySQL关键字。如果必须将它用作表名，则需要在反引号中包装每个引用。

SELECT * FROM `ORDER`...

我建议您将表名称设置为不冲突的内容