Spring 整合 Hibernate

系统管理员 2022-07-18 00:20 240阅读 0赞

1. Spring 整合 Hibernate 整合什么 ?

1). 有 IOC 容器来管理 Hibernate 的 SessionFactory  
2). 让 Hibernate 使用上 Spring 的声明式事务

2. 整合步骤:

1). 加入 hibernate  
①. jar 包  
②. 添加 hibernate 的配置文件: hibernate.cfg.xml  
③. 编写了持久化类对应的 .hbm.xml 文件。

2). 加入 Spring  
①. jar 包  
②. 加入 Spring 的配置文件

3). 整合.

3. 编写代码

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1.applicationContext.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xmlns:context="http://www.springframework.org/schema/context"
    	xmlns:tx="http://www.springframework.org/schema/tx"
    	xmlns:aop="http://www.springframework.org/schema/aop"
    	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
    		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
    		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    	
    	
    	<context:component-scan base-package="com.atguigu.spring.hibernate"></context:component-scan>
    	
    	
    	
    	<context:property-placeholder location="classpath:db.properties"/>
    	
    	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    		<property name="user" value="${jdbc.user}"></property>
    		<property name="password" value="${jdbc.password}"></property>
    		<property name="driverClass" value="${jdbc.driverClass}"></property>
    		<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
    
    		<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
    		<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
    	</bean>
    	
    	
    	<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    		
    		<property name="dataSource" ref="dataSource"></property>
    		
    		
    		
    		<property name="hibernateProperties">
    			<props>
    				<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop>
    				<prop key="hibernate.show_sql">true</prop>
    				<prop key="hibernate.format_sql">true</prop>
    				<prop key="hibernate.hbm2ddl.auto">update</prop>
    			</props>
    		</property>
    		
    		<property name="mappingLocations" 
    			value="classpath:com/atguigu/spring/hibernate/entities/*.hbm.xml"></property>
    	</bean>
    
    	
    	
    	<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
    		<property name="sessionFactory" ref="sessionFactory"></property>
    	</bean>
    
    	
    	<tx:advice id="txAdvice" transaction-manager="transactionManager">
    		<tx:attributes>
    			<tx:method name="get*" read-only="true"/>
    			<tx:method name="purchase" propagation="REQUIRES_NEW"/>
    			<tx:method name="*"/>
    		</tx:attributes>
    	</tx:advice>
    
    	
    	<aop:config>
    		<aop:pointcut expression="execution(* com.atguigu.spring.hibernate.service.*.*(..))" 
    			id="txPointcut"/>
    		<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    	</aop:config>
    
    </beans>

二、配置hibernate.cfg.XML

<?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="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
    
    		<property name="hibernate.show_sql">true</property>
    		<property name="hibernate.format_sql">true</property>
    		
    		<property name="hibernate.hbm2ddl.auto">update</property>
    		
    		
    		    	
        </session-factory>
    </hibernate-configuration>

三、db.properties文件

jdbc.user=root
    jdbc.password=root
    jdbc.driverClass=com.mysql.jdbc.Driver
    jdbc.jdbcUrl=jdbc:mysql:///text
    
    jdbc.initPoolSize=5
    jdbc.maxPoolSize=10

四、dao层 注入 sessionFactory 、hibernateTemplate

@Repository
    public class BookShopDaoImpl implements BookShopDao {
    	
    	@Autowired
    	private SessionFactory sessionFactory;
    	
    	//不推荐使用 HibernateTemplate 和 HibernateDaoSupport
    	//因为这样会导致 Dao 和 Spring 的 API 进行耦合
    	//可以移植性变差
    //	private HibernateTemplate hibernateTemplate;
    	
    	//获取和当前线程绑定的 Session. 
    	private Session getSession(){
    		return sessionFactory.getCurrentSession();
    	}
    
    	@Override
    	public int findBookPriceByIsbn(String isbn) {
    		String hql = "SELECT b.price FROM Book b WHERE b.isbn = ?";
    		Query query = getSession().createQuery(hql).setString(0, isbn);
    		return (Integer)query.uniqueResult();
    	}
    
    	@Override
    	public void updateBookStock(String isbn) {
    		//验证书的库存是否充足. 
    		String hql2 = "SELECT b.stock FROM Book b WHERE b.isbn = ?";
    		int stock = (int) getSession().createQuery(hql2).setString(0, isbn).uniqueResult();
    		if(stock == 0){
    			throw new BookStockException("库存不足!");
    		}
    		
    		String hql = "UPDATE Book b SET b.stock = b.stock - 1 WHERE b.isbn = ?";
    		getSession().createQuery(hql).setString(0, isbn).executeUpdate();
    	}
    
    	@Override
    	public void updateUserAccount(String username, int price) {
    		//验证余额是否足够
    		String hql2 = "SELECT a.balance FROM Account a WHERE a.username = ?";
    		int balance = (int) getSession().createQuery(hql2).setString(0, username).uniqueResult();
    		if(balance < price){
    			throw new UserAccountException("余额不足!");
    		}
    		
    		String hql = "UPDATE Account a SET a.balance = a.balance - ? WHERE a.username = ?";
    		getSession().createQuery(hql).setInteger(0, price).setString(1, username).executeUpdate();
    	}
    
    }

五、service层

@Service
    public class BookShopServiceImpl implements BookShopService {
    
    	@Autowired
    	private BookShopDao bookShopDao;
    	
    	/**
    	 * Spring hibernate 事务的流程
    	 * 1. 在方法开始之前
    	 * ①. 获取 Session
    	 * ②. 把 Session 和当前线程绑定, 这样就可以在 Dao 中使用 SessionFactory 的
    	 * getCurrentSession() 方法来获取 Session 了
    	 * ③. 开启事务
    	 * 
    	 * 2. 若方法正常结束, 即没有出现异常, 则
    	 * ①. 提交事务
    	 * ②. 使和当前线程绑定的 Session 解除绑定
    	 * ③. 关闭 Session
    	 * 
    	 * 3. 若方法出现异常, 则:
    	 * ①. 回滚事务
    	 * ②. 使和当前线程绑定的 Session 解除绑定
    	 * ③. 关闭 Session
    	 */
    	@Override
    	public void purchase(String username, String isbn) {
    		int price = bookShopDao.findBookPriceByIsbn(isbn);
    		bookShopDao.updateBookStock(isbn);
    		bookShopDao.updateUserAccount(username, price);
    	}
    
    }

六、test测试

public class SpringHibernateTest {
    
    	private ApplicationContext ctx = null;
    	private BookShopService bookShopService = null;
    	
    	
    	{
    		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    		bookShopService = ctx.getBean(BookShopService.class);
    	
    	}
    	
    
    	
    	@Test
    	public void testBookShopService(){
    		bookShopService.purchase("aa", "1001");
    	}
    	
    	@Test
    	public void testDataSource() throws SQLException {
    		DataSource dataSource = ctx.getBean(DataSource.class);
    		System.out.println(dataSource.getConnection());
    	}
    
    }

七、其中自己写了个异常extends RuntimeException：

public class BookStockException extends RuntimeException{
    
    	/**
    	 * 
    	 */
    	private static final long serialVersionUID = 1L;
    
    	public BookStockException() {
    		super();
    		// TODO Auto-generated constructor stub
    	}
    
    	public BookStockException(String message, Throwable cause,
    			boolean enableSuppression, boolean writableStackTrace) {
    		super(message, cause, enableSuppression, writableStackTrace);
    		// TODO Auto-generated constructor stub
    	}
    
    	public BookStockException(String message, Throwable cause) {
    		super(message, cause);
    		// TODO Auto-generated constructor stub
    	}
    
    	public BookStockException(String message) {
    		super(message);
    		// TODO Auto-generated constructor stub
    	}
    
    	public BookStockException(Throwable cause) {
    		super(cause);
    		// TODO Auto-generated constructor stub
    	}
    
    	
    }

八、bean及映射配置

public class Book {
    
    	private Integer id;
    	private String bookName;
    	private String isbn;
    	private int price;
    	private int stock;
    
    //添加set、get方法。。

｝

<?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.atguigu.spring.hibernate.entities.Book" table="SH_BOOK">
        
            <id name="id" type="java.lang.Integer">
                <column name="ID" />
                <generator class="native" />
            </id>
            
            <property name="bookName" type="java.lang.String">
                <column name="BOOK_NAME" />
            </property>
            
            <property name="isbn" type="java.lang.String">
                <column name="ISBN" />
            </property>
            
            <property name="price" type="int">
                <column name="PRICE" />
            </property>
            
            <property name="stock" type="int">
                <column name="STOCK" />
            </property>
            
        </class>
    </hibernate-mapping>

九、目录

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