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私はまだHibernateを学んでおり、 "ManyToMany"リフレクションでデータベースをマップできるアプリケーションを開発する必要があります。 PRODUCT、SHOP、SHOP_PRODUCTの3つのテーブルがあります。Hibernateで "mappedByReference"例外を修正するにはどうすればいいですか？
Product.class
@Entity
@Table(name="PRODUCT")
public class Product {
@Id @GeneratedValue @Column(name="PRODUCT_ID")
private Integer productId;
@Column(name="PRODUCT_NAME", length=50, nullable=false)
private String productName;
@Column(name="RECOMMENDED_PRICE", length=10, precision=2)
private BigDecimal recommendedPrice;
@OneToMany(fetch=FetchType.LAZY, mappedBy="shopProducts")
private Collection<ShopProduct> shopProducts;
public void setShopProducts(Collection<ShopProduct> shopProducts) {
this.shopProducts=shopProducts;
}
public Collection<ShopProduct> getShopProducts() {
return shopProducts;
}
public void setProductId(Integer productId) {
this.productId=productId;
}
public Integer getProductId() {
return productId;
}
public void setProductName(String productName) {
this.productName=productName;
}
public String getProductName() {
return productName;
}
public void setRecommendedPrice(BigDecimal recommendedPrice) {
this.recommendedPrice=recommendedPrice;
}
public BigDecimal getRecommendedPrice() {
return recommendedPrice;
}
}
Shop.class：
@Entity
@Table(name="SHOP")
public class Shop implements Serializable{
@Id @GeneratedValue @Column(name="SHOP_ID")
private Integer shopId;
@Column(name="SHOP_NAME", length=50, nullable=false)
private String shopName;
@OneToMany(fetch=FetchType.LAZY, mappedBy="shopProducts")
private Collection<ShopProduct> shopProducts;
public Collection<ShopProduct> getShopProducts() {
return shopProducts;
}
public void setShopProducts(Collection<ShopProduct> shopProducts) {
this.shopProducts=shopProducts;
}
public Integer getShopId() {
return shopId;
}
public void setShopId(Integer shopId) {
this.shopId=shopId;
}
public String getShopName() {
return shopName;
}
public void setShopName(String shopName) {
this.shopName=shopName;
}
}
ShopProduct.class：
@Entity
@Table(name="SHOP_PRODUCT")
@AssociationOverrides({
@AssociationOverride(name="shopProducts", [email protected](name="SHOP_ID")),
@AssociationOverride(name="shopProducts", [email protected](name="PRODUCT_ID"))
})
public class ShopProduct implements Serializable{
@EmbeddedId
private ShopProductId id;
@Column(name="PRODUCT_PRICE", length=10, precision=2)
private BigDecimal productPrice;
@Column(name="PRODUCT_COUNT", length=10)
private Integer productCount;
public void setShopProductId(ShopProductId id) {
this.id=id;
}
public ShopProductId getShopProductId() {
return id;
}
public void setShop(Shop shop) {
id.setShop(shop);
}
public void setProduct(Product product) {
id.setProduct(product);
}
public Shop getShop() {
return id.getShop();
}
public Product getProduct() {
return id.getProduct();
}
public void setProductPrice(BigDecimal productPrice) {
this.productPrice=productPrice;
}
public BigDecimal getProductPrice() {
return productPrice;
}
public void setProductCount(Integer productCount) {
this.productCount=productCount;
}
public Integer getProductCount() {
return productCount;
}
@Override
public boolean equals(Object o) {
if (this==o) {
return true;
}
if (o==null || this.getClass()!=o.getClass()) {
return false;
}
ShopProduct sp=(ShopProduct)o;
if (id!=null ? !id.equals(sp.getShopProductId()) : sp.getShopProductId()!=null) {
return false;
}
return true;
}
@Override
public int hashCode() {
return (id!=null ? id.hashCode() : 0);
}
}
ShoProductId.class：
@Entity
@Table(name="SHOP_PRODUCT")
@AssociationOverrides({
@AssociationOverride(name="shopProducts", [email protected](name="SHOP_ID")),
@AssociationOverride(name="shopProducts", [email protected](name="PRODUCT_ID"))
})
public class ShopProduct implements Serializable{
@EmbeddedId
private ShopProductId id;
@Column(name="PRODUCT_PRICE", length=10, precision=2)
private BigDecimal productPrice;
@Column(name="PRODUCT_COUNT", length=10)
private Integer productCount;
public void setShopProductId(ShopProductId id) {
this.id=id;
}
public ShopProductId getShopProductId() {
return id;
}
public void setShop(Shop shop) {
id.setShop(shop);
}
public void setProduct(Product product) {
id.setProduct(product);
}
public Shop getShop() {
return id.getShop();
}
public Product getProduct() {
return id.getProduct();
}
public void setProductPrice(BigDecimal productPrice) {
this.productPrice=productPrice;
}
public BigDecimal getProductPrice() {
return productPrice;
}
public void setProductCount(Integer productCount) {
this.productCount=productCount;
}
public Integer getProductCount() {
return productCount;
}
@Override
public boolean equals(Object o) {
if (this==o) {
return true;
}
if (o==null || this.getClass()!=o.getClass()) {
return false;
}
ShopProduct sp=(ShopProduct)o;
if (id!=null ? !id.equals(sp.getShopProductId()) : sp.getShopProductId()!=null) {
return false;
}
return true;
}
@Override
public int hashCode() {
return (id!=null ? id.hashCode() : 0);
}
}
Main.class：
public class Main {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session=new AnnotationConfiguration().configure().buildSessionFactory().openSession();
//System.out.println(product.getShops().size());
}
}
はhibernate.cfg.xmlの：私はそれを実行しようとすると
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.url">jdbc:mysql://localhost/shop_db</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password"></property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<mapping class="com.nda.hibernate.Product"/>
<mapping class="com.nda.hibernate.Shop"/>
<mapping class="com.nda.hibernate.ShopProduct"/>
<mapping class="com.nda.hibernate.ShopProductId"/>
</session-factory>
</hibernate-configuration>
私はこの例外を持っているでしょう：
Caused by: org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.nda.hibernate.ShopProduct.shopProducts in com.nda.hibernate.Product.shopProducts
at org.hibernate.cfg.annotations.CollectionBinder.bindStarToManySecondPass(CollectionBinder.java:666)
at org.hibernate.cfg.annotations.CollectionBinder$1.secondPass(CollectionBinder.java:626)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:66)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1587)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1362)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1727)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1778)
at com.nda.hibernate.Sessions.<clinit>(Sessions.java:14)
... 1 more
私は修正することができますどのようにそれ？ありがとうございました。
ありがとうございます。私はエラーを見つけたばかりです。 ShopとProductクラスでは、 "mapped.by"の値を 'id.shop'と 'id.product'に変更する必要があります。また、ShopProduct.classから 'AssociationOverride'属性の値を変更する必要があります。 – user1166635