经网上查阅资料仍没有找到解决方法
不知该如何写两个pojo的配置文件
向各位达人请教
一端——Product
public class Product {
private Long productId; //id
private String productName; //名称
private Set featureSet; //特性集合
.....
}
public class Feature implements Serializable {
private Integer featureId;
private String featureName;
private Product product;
....
}
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[code="sql"]
create table product (
product_id bigint primary key,
product_name varchar(255)
);
create table feature (
feature_id bigint,
feature_name varchar(255),
product_id bigint,
primary key(feature_id, product_id),
foreign key (product_id) reference product(product_id)
);
[/code]
[code="xml"]
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
package="domain">
<class
name="Product"
table="product"
dynamic-insert="true"
>
<id
name="productId"
column="product_id">
<generator class="sequence" >
<param name="sequence">seq</param>
</generator>
</id>
<property name="productName" column="product_name" />
<set name="featureSet" inverse="true" cascade="all">
<key column="product_id" not-null="true" />
<one-to-many class="Feature" />
</set>
</class>
[/code]
[code="xml"]
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
package="domain">
<class
name="Feature"
table="feature"
dynamic-insert="true"
>
<composite-id>
<key-property name="featureId" column="feature_id" />
<key-many-to-one name="product" column="product_id" class="Product" />
</composite-id>
<property name="featureName" column="feature_name" />
</class>
[/code]
[code="java"]
package domain;
import java.io.Serializable;
public class Feature implements Serializable {
private Long featureId;
private String featureName;
private Product product;
public Feature() {
super();
}
public Long getFeatureId() {
return featureId;
}
public void setFeatureId(Long featureId) {
this.featureId = featureId;
}
public String getFeatureName() {
return featureName;
}
public void setFeatureName(String featureName) {
this.featureName = featureName;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + ((featureName == null) ? 0 : featureName.hashCode());
result = PRIME * result + ((product == null) ? 0 : product.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Feature other = (Feature) obj;
if (featureName == null) {
if (other.featureName != null)
return false;
} else if (!featureName.equals(other.featureName))
return false;
if (product == null) {
if (other.product != null)
return false;
} else if (!product.equals(other.product))
return false;
return true;
}
}
[/code]
[code="java"]
package domain;
import java.io.Serializable;
import java.util.Set;
import java.util.HashSet;
public class Product implements Serializable {
private Long productId;
private String productName;
private Set featureSet = new HashSet<Feature>();
public Product() {
super();
}
public Set getFeatureSet() {
return featureSet;
}
public void setFeatureSet(Set featureSet) {
this.featureSet = featureSet;
}
public Long getProductId() {
return productId;
}
public void setProductId(Long productId) {
this.productId = productId;
}
public String getProductName() {
return productName;
}
public void setProductName(String productName) {
this.productName = productName;
}
public void addFeature(Feature f) {
removeFeature(f);
getFeatureSet().add(f);
f.setProduct(this);
}
public void removeFeature(Feature f) {
if(f == null) {
throw new IllegalArgumentException("feature is null");
}
if(f.getProduct() != null && f.getProduct().getFeatureSet() != null) {
f.getProduct().getFeatureSet().remove(f);
}
f.setProduct(null);
}
@Override
public int hashCode() {
final int PRIME = 31;
int result = 1;
result = PRIME * result + ((productName == null) ? 0 : productName.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final Product other = (Product) obj;
if (productName == null) {
if (other.productName != null)
return false;
} else if (!productName.equals(other.productName))
return false;
return true;
}
}
[/code]
[code="java"]
package app;
import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import domain.*;
public class Test {
public static void main(String[] args) {
SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
Feature f1 = new Feature();
f1.setFeatureId(Long.valueOf(1));
f1.setFeatureName("1");
Feature f2 = new Feature();
f2.setFeatureId(Long.valueOf(2));
f2.setFeatureName("2");
Feature f3 = new Feature();
f3.setFeatureId(Long.valueOf(3));
f3.setFeatureName("3");
Product p = new Product();
p.setProductName("a");
p.addFeature(f1);
p.addFeature(f2);
p.addFeature(f3);
session.save(p);
tx.commit();
session.close();
sessionFactory.close();
}
}
[/code]
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