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spring整合hibernate之买书小测试
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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());
}
}
