【发布时间】：2014-12-10 06:30:21
【问题描述】：
我正在编写一个包含产品、客户、信用卡和购物车的网络应用程序。客户在信用卡和购物车上都有一对多的映射。在我的客户类中，我有一个列表和列表。当我访问 customer.creditCardList 时，一切正常。当我为 customer.shoppingCartList 尝试相同的操作时，我收到此错误。
error] Test models.ModelsTest.createAndRetrieveCart failed: javax.persistence.PersistenceException:
ERROR executing DML bindLog[] error[Field 'customer_id' doesn't have a default value]
在我没有收到任何错误之前，我的 shoppingCartList 始终为空，即使数据库中有商品。
这是我抛出错误的测试函数：
@测试
public void createAndRetrieveCart(){
Customer walter = Customer.find.where().eq("email", "test@banananow.com").findUnique();
Product p1 = Product.find.where().idEq(1).findUnique();
Product p2 = Product.find.where().idEq(2).findUnique();
new ShoppingCart(walter, p1, 2).save();
new ShoppingCart(walter, p2, 3).save();
if(walter.shoppingCartList.size() < 2){
assert(false);
}
for(ShoppingCart cart : walter.shoppingCartList){
assertNotNull(cart.product.name);
assertNotNull(cart.product.price);
System.out.println(cart.product.name);
System.out.println(cart.product.price);
System.out.println(cart.quantity);
}
}
错误发生在第 123 行，即第一个 ShoppingCart.save() 奇怪的部分与 creditCardList 通行证的代码几乎相同，并且工作正常。这是那个测试
public void createAndAddCreditCard(){
Customer walter = Customer.find.where().eq("email", "tester@test.com").findUnique();
//Date date = new Date(2017, 10, 1);
//new CreditCard(1234567812345679L, walter, "walter wooodall", date, 21919, 123).save();
for(CreditCard card : walter.creditCardList){
System.out.println(card.number);
}
}
这是我的模型：
客户：
@Entity
public class Customer extends Model {
@Id
public int id;
public String email;
public String password;
public String name;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name="address_id")
public Address address;
public double balance;
@OneToMany(mappedBy = "customer")
public List<CreditCard> creditCardList;
@OneToMany(mappedBy = "customer")
public List<Basket> basketList;
@OneToMany(mappedBy = "customer")
public List<ShoppingCart> shoppingCartList;
public Customer(String email, String password, String name, Address address){
this.email = email.toLowerCase();
this.password = password;
this.name = name.toLowerCase();
this.address = address;
this.balance = 0.0;
//this.creditCardList = new ArrayList<CreditCard>();
//this.shoppingCartList = new ArrayList<ShoppingCart>();
}
public static Finder<String, Customer> find = new Finder<String, Customer>(String.class, Customer.class);
public static Customer authenticate(String email, String password) {
return find.where().eq("email", email)
.eq("password", password).findUnique();
}
public static Customer exists(String email) {
return find.where().eq("email", email).findUnique();
}
/*
public List<CreditCard> getCreditCardList(){
return CreditCard.find.where().eq("customer_id", this.id).findList();
}
*/
}
购物车：
@Entity
@Table(name="shopping_cart")
public class ShoppingCart extends Model{
@Id
public int id;
@ManyToOne
@JoinColumn(name = "customer_id", insertable = false, updatable = false)
public Customer customer;
@ManyToOne
@JoinColumn(name = "product_id", insertable = false, updatable = false)
public Product product;
public int quantity;
public ShoppingCart(Customer customer, Product product, int quantity){
this.customer = customer;
this.product = product;
this.quantity = quantity;
}
public static Finder<String, ShoppingCart> find = new Finder<String, ShoppingCart>(String.class, ShoppingCart.class);
}
产品：
@Entity
public class Product extends Model{
@Id
public int id;
public String name;
public Float price;
public String category;
public String subcategory;
@Column(name = "image_url")
public String imageUrl;
public String url;
@ManyToOne
public Store store;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "product")
public List<BasketProduct> basket_product;
@OneToMany(mappedBy = "product")
public List<ShoppingCart> shoppingCartList;
public Product(String name, Float price, String category, String subcategory, String imageUrl, String url, Store store){
this.name = name;
this.price = price;
this.category = category;
this.subcategory = subcategory;
this.imageUrl = imageUrl;
this.url = url;
this.store = store;
}
public Product(int id, String name, Float price, String category, String subcategory, String imageUrl, String url, Store store){
this.id = id;
this.name = name;
this.price = price;
this.category = category;
this.subcategory = subcategory;
this.imageUrl = imageUrl;
this.url = url;
this.store = store;
}
public static Finder<String, Product> find = new Finder<String, Product>(String.class, Product.class);
public static List<Product> getTopProducts(){
String sql = "select * from top_product";
SqlQuery sqlQuery = Ebean.createSqlQuery(sql);
List<SqlRow> sqlRows = sqlQuery.findList();
List<Product> productList = null;
if(sqlRows != null){
productList = new LinkedList<Product>();
for(SqlRow row : sqlRows){
int id = row.getInteger("id");
String name = row.getString("name");
float price = row.getFloat("price");
String category = row.getString("category");
String subcategory = row.getString("subcategory");
String imageUrl = row.getString("image_url");
String url = row.getString("url");
String storeId = row.getString("store_id");
productList.add(new Product(id, name, price, category, subcategory, imageUrl, url, Store.find.byId(storeId)));
}
}
return productList;
}
@Override
public String toString() {
return "Product{" +
"id=" + id +
", name='" + name + '\'' +
", price=" + price +
", category='" + category + '\'' +
", subcategory='" + subcategory + '\'' +
", image_url='" + imageUrl + '\'' +
", url='" + url + '\'' +
'}';
}
}
我的表中有 id、customer_id、product_id 和数量，以及对客户和产品的 FK 引用。
其他人有这个问题并且知道如何解决吗？？
【问题讨论】：
-
看看这个link
标签： orm playframework playframework-2.0 ebean