EmbeddedId不为两个变量创建索引

Question

我有一个购物车表，其中有一个embededKey cartId（customer，product）和称为“数量”的附加列。创建表时，将为主键（客户，产品）和Fk_cart_product（产品）创建索引，但不会为客户外键创建索引。

仍然为产品和客户创建外键约束素，仅缺少客户类别索引。

购物车

@Entity
public class Cart{

@EmbeddedId
private CartId cartId;

@Column( columnDefinition="INTEGER(10) UNSIGNED")
private Integer quantity;

public Cart(CartId cartId, Integer quantity) {
    super();
    this.cartId = cartId;
    this.quantity = quantity;
}

public CartId getCartId() {
    return cartId;
}

public void setCartId(CartId cartId) {
    this.cartId = cartId;
}

public Integer getQuantity() {
    return quantity;
}

public void setQuantity(Integer quantity) {
    this.quantity = quantity;
}


}

// CartId

@Embeddable
public class CartId implements Serializable{

private static final long serialVersionUID = 1L;


@ManyToOne
@JoinColumn(name="product_id",columnDefinition="INTEGER(10) 
UNSIGNED",foreignKey=@ForeignKey(name="Fk_cart_product"))
private Product product;


@ManyToOne
@JoinColumn(name="customer_id",columnDefinition="INTEGER(10) 
UNSIGNED",foreignKey=@ForeignKey(name="Fk_cart_customer"))
private Customer customer;


public CartId(Product product, Customer customer) {
    super();
    this.product = product;
    this.customer = customer;
}


public Product getProduct() {
    return product;
}


public void setProduct(Product product) {
    this.product = product;
}


public Customer getCustomer() {
    return customer;
}


public void setCustomer(Customer customer) {
    this.customer = customer;
}

}