spring整合hibernate之买书小测试
spring来整合hibernate就是用spring来管理hibernate的sessionFactory和让hibernate来使用spring的声明式事务。
一：加入相应的jar包。
二：写hibernate的配置文件
<?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> <!-- 配置 hibernate 的基本属性 --> <!-- 1. 数据源需配置到 IOC 容器中, 所以在此处不再需要配置数据源 --> <!-- 2. 关联的 .hbm.xml 也在 IOC 容器配置 SessionFactory 实例时在进行配置 --> <!-- 3. 配置 hibernate 的基本属性: 方言, SQL 显示及格式化, 生成数据表的策略以及二级缓存等. --> <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="hbm2ddl.auto">update</property> <!-- 配置 hibernate 二级缓存相关的属性. --> </session-factory> </hibernate-configuration>
三：写spring的配置文件
<?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"> <!-- 配置自动扫描的包 --> <context:component-scan base-package="com.zhenghe"></context:component-scan> <!--1: 配置加载数据源 --> <!-- 导入资源文件 --> <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> <!-- 2:配置hibernate的SessionFactory实例：通过Spring提供的 LocalSessionFactoryBean 进行配置 --> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <!-- 配置数据源属性 --> <property name="dataSource" ref="dataSource"></property> <!-- 配置hibernate配置文件的位置和名称 --> <property name="configLocation" value="classpath:hibernate.cfg.xml"></property> <!-- 配置hibernate映射文件的位置和名称 --> <property name="mappingLocations" value="classpath:com/zhenghe/entities/*.hbm.xml" ></property> </bean> <!-- 3:配置Spring的声明式事务 --> <!-- 1）：配置事务管理器 --> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"></property> </bean> <!-- 2):配置事务属性，需要事务管理器 --> <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> <!-- 3）：配置事务切点，并把切点和事务属性关联起来 --> <aop:config> <aop:pointcut expression="execution(* com.zhenghe.service.*.*(..))" id="txPointcut"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/> </aop:config> </beans>
四：写相应的买家和书的实体
package com.zhenghe.entities; public class Account { private Integer id; private String username; private int balance;//余额 public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getBalance() { return balance; } public void setBalance(int balance) { this.balance = balance; } }
package com.zhenghe.entities; public class Book { private Integer id;//id private String bookName;//书名 private String isbn;//书号 private int price;//价格 private int stock;//库存 public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getBookName() { return bookName; } public void setBookName(String bookName) { this.bookName = bookName; } public String getIsbn() { return isbn; } public void setIsbn(String isbn) { this.isbn = isbn; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public int getStock() { return stock; } public void setStock(int stock) { this.stock = stock; } }
然后写相应的hibernate映射文件
<?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.zhenghe.entities.Account" table="SH_ACCOUNT">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>
<property name="username" type="java.lang.String">
<column name="USERNAME" />
</property>
<property name="balance" type="int">
<column name="BALANCE" />
</property>
</class>
</hibernate-mapping>
<?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.zhenghe.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>
五：写对数据的操作
package com.zhenghe.dao.impl; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import com.zhenghe.dao.BookShopDao; import com.zhenghe.exceptions.BookStockException; import com.zhenghe.exceptions.UserAccountException; @Repository public class BookShopDaoImpl implements BookShopDao{ @Autowired private SessionFactory sessionFactory; //获取和当前线程绑定的Session private Session getSession(){ return sessionFactory.getCurrentSession(); } 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(); } 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=(Integer) 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(); System.out.println(hql); } 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 = (Integer) 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(); } }
六：执行数据
package com.zhenghe.service.impl; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.zhenghe.dao.BookShopDao; import com.zhenghe.service.BookShopService; @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
*/ public void purchase(String username, String isbn) { int price=bookShopDao.findBookPriceByIsbn(isbn); bookShopDao.updateBookStock(isbn); bookShopDao.updateUserAccount(username, price); } }
买两种书：
import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.atguigu.spring.hibernate.service.BookShopService; import com.atguigu.spring.hibernate.service.Cashier; @Service public class CashierImpl implements Cashier{ @Autowired private BookShopService bookShopService; @Override public void checkout(String username, List<String> isbns) { for(String isbn:isbns){ bookShopService.purchase(username, isbn); } } }
测试：
public class SpringHibernateTest { private ApplicationContext ctx = null; private BookShopService bookShopService = null; private Cashier cashier = null; { ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); bookShopService = ctx.getBean(BookShopService.class); cashier = ctx.getBean(Cashier.class); } @Test public void testCashier(){ cashier.checkout("aa", Arrays.asList("1001","1002")); } @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()); } }
