橘子味的心
标题:Spring+Hibernate+MySql实例

这个例子将创建一个简单的 Java 项目结构,并演示如何使用 Hibernate 在Spring框架进行 MySQL 数据库的数据处理工作(插入,选择,更新和删除)。


最终项目结构

最终的项目文件结构应该看起来如下面的图中显示。

1.创建表

在MySQL数据库中创建一张 “stock”表。 SQL语句如下:
CREATE TABLE  `yiibai`.`stock` (
  `STOCK_ID` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `STOCK_CODE` varchar(10) NOT NULL,
  `STOCK_NAME` varchar(20) NOT NULL,
  PRIMARY KEY (`STOCK_ID`) USING BTREE,
  UNIQUE KEY `UNI_STOCK_NAME` (`STOCK_NAME`),
  UNIQUE KEY `UNI_STOCK_ID` (`STOCK_CODE`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

2. Model & BO & DAO

模型中,业务对象(BO)和数据访问对象(DAO)模式是有助于清楚地识别层,以避免弄乱项目结构。
Stock Model
Stock 模型类以后用于存储库存数据。
package com.yiibai.stock.model;

import java.io.Serializable;

public class Stock implements Serializable {

	private static final long serialVersionUID = 1L;

	private Long stockId;
	private String stockCode;
	private String stockName;

	//getter and setter methods...
}
Stock Business Object (BO))
Stock 业务对象(BO)接口和实现,它是用来存储项目的业务功能,真正的数据库操作(CRUD)的工作不应该参与这一个类,而是有一个DAO(StockDao)类来做到这一点。
package com.yiibai.stock.bo;

import com.yiibai.stock.model.Stock;

public interface StockBo {
	
	void save(Stock stock);
	void update(Stock stock);
	void delete(Stock stock);
	Stock findByStockCode(String stockCode);
}
package com.yiibai.stock.bo.impl;

import com.yiibai.stock.bo.StockBo;
import com.yiibai.stock.dao.StockDao;
import com.yiibai.stock.model.Stock;

public class StockBoImpl implements StockBo{
	
	StockDao stockDao;
	
	public void setStockDao(StockDao stockDao) {
		this.stockDao = stockDao;
	}

	public void save(Stock stock){
		stockDao.save(stock);
	}
	
	public void update(Stock stock){
		stockDao.update(stock);
	}
	
	public void delete(Stock stock){
		stockDao.delete(stock);
	}
	
	public Stock findByStockCode(String stockCode){
		return stockDao.findByStockCode(stockCode);
	}
}
Stock Data Access Object

Stock DAO接口和实现,DAO实现类扩展了 Spring 的“HibernateDaoSupport”,以使Spring框架支持Hibernate。 现在,你可以通过getHibernateTemplate()执行 Hibernate 功能。

package com.yiibai.stock.dao;

import com.yiibai.stock.model.Stock;

public interface StockDao {
	
	void save(Stock stock);
	void update(Stock stock);
	void delete(Stock stock);
	Stock findByStockCode(String stockCode);

}
package com.yiibai.stock.dao.impl;

import java.util.List;

import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.yiibai.stock.dao.StockDao;
import com.yiibai.stock.model.Stock;

public class StockDaoImpl extends HibernateDaoSupport implements StockDao{
	
	public void save(Stock stock){
		getHibernateTemplate().save(stock);
	}
	
	public void update(Stock stock){
		getHibernateTemplate().update(stock);
	}
	
	public void delete(Stock stock){
		getHibernateTemplate().delete(stock);
	}
	
	public Stock findByStockCode(String stockCode){
		List list = getHibernateTemplate().find(
                      "from Stock where stockCode=?",stockCode
                );
		return (Stock)list.get(0);
	}

}

5.资源配置

用于存储 Spring,Hibernate 等配置文件。
Hibernate Configuration
创建 Hibernate 映射文件(Stock.hbm.xml)的 Stock 表,把它放在“resources/hibernate/”文件夹中。
<?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="com.yiibai.stock.model.Stock" table="stock" catalog="yiibai">
        <id name="stockId" type="java.lang.Long">
            <column name="STOCK_ID" />
            <generator class="identity" />
        </id>
        <property name="stockCode" type="string">
            <column name="STOCK_CODE" length="10" not-null="true" unique="true" />
        </property>
        <property name="stockName" type="string">
            <column name="STOCK_NAME" length="20" not-null="true" unique="true" />
        </property>
    </class>
</hibernate-mapping>
Spring Configuration

Database related….

创建一个属性文件(database.properties)数据库的详细信息,把它放在“resources/properties” 文件夹中。这是很好的做法,不同于数据库细节并将 Spring bean 配置成不同的文件。

database.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/yiibai
jdbc.username=root
jdbc.password=password
为你的数据库创建一个“dataSource” bean配置文件(DataSource.xml),并从database.properties导入的属性,把它放入到 “resources/database” 文件夹中。

DataSource.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
	
<bean 
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
	<property name="location">
		<value>properties/database.properties</value>
	</property>
</bean>

<bean id="dataSource" 
         class="org.springframework.jdbc.datasource.DriverManagerDataSource">
	<property name="driverClassName" value="${jdbc.driverClassName}" />
	<property name="url" value="${jdbc.url}" />
	<property name="username" value="${jdbc.username}" />
	<property name="password" value="${jdbc.password}" />
</bean>

</beans>

Hibernate 关联….

创建一个会话工厂 bean 配置文件(Hibernate.xml),把它放入 “resources/database” 文件夹中。这个 LocalSessionFactoryBean 中设置一个共享的 Hibernate SessionFactory 在一个 Spring 应用程序上下文。

Hibernate.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
    
<!-- Hibernate session factory -->
<bean id="sessionFactory" 
     class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

    <property name="dataSource">
      <ref bean="dataSource"/>
    </property>

    <property name="hibernateProperties">
       <props>
         <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
         <prop key="hibernate.show_sql">true</prop>
       </props>
     </property>
    	
     <property name="mappingResources">
	<list>
           <value>/hibernate/Stock.hbm.xml</value>
	</list>
      </property>	

    </bean>
</beans>

Spring beans related….

创建一个bean配置文件(Stock.xml)的BO和DAO类,把它放入 “resources/spring” 文件夹中。依赖的 DAO(stockDao)bean 注入到 bo(stockBo)bean; SessionFactory 的 bean 成stockDao。

Stock.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

    <!-- Stock business object -->
   <bean id="stockBo" class="com.yiibai.stock.bo.impl.StockBoImpl" >
   		<property name="stockDao" ref="stockDao" />
   </bean>
 
   <!-- Stock Data Access Object -->
   <bean id="stockDao" class="com.yiibai.stock.dao.impl.StockDaoImpl" >
   		<property name="sessionFactory" ref="sessionFactory"></property>
   </bean>
   
</beans>
导入所有的Spring bean配置文件合并为一个文件(BeanLocations.xml),把它变成了“resources/config”文件夹。

BeanLocations.xml

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<!-- Database Configuration -->
	<import resource="../database/DataSource.xml"/>
	<import resource="../database/Hibernate.xml"/>
	
	<!-- Beans Declaration -->
	<import resource="../beans/Stock.xml"/>
	
</beans>

6. 运行它

把所有的文件和配置,运行它。
package com.yiibai.common;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.yiibai.stock.bo.StockBo;
import com.yiibai.stock.model.Stock;

public class App 
{
    public static void main( String[] args )
    {
    	ApplicationContext appContext = 
    	  new ClassPathXmlApplicationContext("spring/config/BeanLocations.xml");
	
    	StockBo stockBo = (StockBo)appContext.getBean("stockBo");
    	
    	/** insert **/
    	Stock stock = new Stock();
    	stock.setStockCode("7668");
    	stock.setStockName("HAIO");
    	stockBo.save(stock);
    	
    	/** select **/
    	Stock stock2 = stockBo.findByStockCode("7668");
    	System.out.println(stock2);
    	
    	/** update **/
    	stock2.setStockName("HAIO-1");
    	stockBo.update(stock2);
    	
    	/** delete **/
    	stockBo.delete(stock2);
    	
    	System.out.println("Done");
    }
}

输出结果:


Hibernate: insert into yiibai.stock (STOCK_CODE, STOCK_NAME) values (?, ?)
Hibernate: select stock0_.STOCK_ID as STOCK1_0_, stock0_.STOCK_CODE as STOCK2_0_, stock0_.STOCK_NAME as STOCK3_0_ from yiibai.stock stock0_ where stock0_.STOCK_CODE=?
Stock [stockCode=7667, stockId=1, stockName=HAIO]
Hibernate: update yiibai.stock set STOCK_CODE=?, STOCK_NAME=? where STOCK_ID=?
Done




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