Hibernate 单向一对多 -

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Hibernate 单向一对多

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Hibernate 单向一对多

package model;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
//产品分类表
public class Category implements Serializable {

private static final long serialVersionUID = 1L;

private Integer id;
private String name;
    private String description;
    private Set<Product> products=new HashSet<Product>();

    public Category(){

    }

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

public Set<Product> getProducts() {
return products;
}

public void setProducts(Set<Product> products) {
  this.products = products;
}


}

Category.hbm.xml如下:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

<class name="model.Category" table="category">
  <id name="id" type="java.lang.Integer">
   <column name="ID" precision="8"></column>
   <generator class="increment"></generator>
  </id>
  <property name="name" column="name" length="40" type="java.lang.String"></property>
  <property name="description" column="description" length="200" type="java.lang.String"></property>
  <set name="products" lazy="false" cascade="save-update,delete">
   <key column="CATEGORY_ID"></key>
   <one-to-many class="model.Product"/>
  </set>
</class>
</hibernate-mapping>

package model;

import java.io.Serializable;
//产品表
public class Product implements Serializable {

private static final long serialVersionUID = 1L;

private Integer id;
private String name;
private Double price;
private String description;
//private Category category;

public Product(){

}

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public Double getPrice() {
return price;
}

public void setPrice(Double price) {
this.price = price;
}

public String getDescription() {
return description;
}

public void setDescription(String description) {
this.description = description;
}

}

Product.hbm.xml如下:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>

<class name="model.Product" table="product" >
  <id name="id" type="java.lang.Integer">
   <column name="ID" precision="8"></column>
   <generator class="increment"></generator>
  </id>
  <property name="name" column="name" length="200" type="java.lang.String"></property>
  <property name="price" column="price" precision="8" type="java.lang.Double"></property>
  <property name="description" column="description" length="2000" type="java.lang.String"></property>

</class>
</hibernate-mapping>