Spring+Hibernate+MySql实例 - Spring教程
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