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());
    }

}