Hibernate 单向多对一 -

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Hibernate 单向多对一

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Hibernate 单向多对一

package model;
import java.io.Serializable;
//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;

    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;
}


}
Category.hbm.xml如下:

然后是产品:

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;
}

public Category getCategory() {
return category;
}

public void setCategory(Category category) {
this.category = category;
}

}
然后是:Product.hbm.xml

<?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>
  
  <many-to-one name="category" class="model.Category" lazy="false">
    <column name="CATEGORY_ID" precision="8" scale="0"></column>
  </many-to-one>
</class>
</hibernate-mapping>

hibernate.cfg.xml的配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
  <property name="connection.url">jdbc:oracle:thin:@localhost:1521:ORCL</property>
  <property name="connection.username">scott</property>
  <property name="connection.password">123456</property>
  <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
  <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
  <property name="current_session_context_class">thread</property>
  <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">update</property>
        <property name="format_sql">true</property>
        
        <property name="connection_provider_class">
         org.hibernate.connection.C3P0ConnectionProvider
        </property>
        <property name="hibernate.c3p0.min_size">5</property>
        <property name="hibernate.c3p0.max_size">10</property>
  <property name="hibernate.c3p0.max_statements">50</property>
  <property name="hibernate.c3p0.timeout">3600</property>
  <property name="hibernate.c3p0.idle_test_period">120</property>
  <property name="hibernate.c3p0.acquire_increment">2</property>
        <mapping resource="model/Category.hbm.xml"/>
        <mapping resource="model/Product.hbm.xml"/>
</session-factory>
</hibernate-configuration>