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  • Spring笔记⑤--整合hibernate代码测试

    String整合hibernate代码测试

    在上节生成的表中插入数据:

     

    注意:使用myeclipse2014生成的整合项目可能存在问题需要我们自己导入。

     

    第一步 我们写dao接口

    package com.ssh.spring_hibernate.dao;

     

    public interface BookShopDao {

        //根据书号获取数的单价

        public int findBookPriceByIsbn(String isbn);

        

        //更新书的库存,使书号对应的库存-1

        public void updataBookStock(String isbn);

        

        //更新用户的账户余额:使usernamebalance-price

        public void updateUserAccount(String username,int price);

    }

    写好其实现类

    package com.ssh.spring_hibernate.dao;

     

    import org.hibernate.Query;

    import org.hibernate.Session;

    import org.hibernate.SessionFactory;

    import org.springframework.beans.factory.annotation.Autowired;

    import org.springframework.stereotype.Repository;

    @Repository

    public class BookShopDaoImpl implements BookShopDao {

        /**

         * 怎么用hibernate

         * SessionFactory中拿到跟当前线程绑定的Session

         */

        

        @Autowired

        private SessionFactory sessionFactory;

        

        public Session getSession(){

            return sessionFactory.getCurrentSession();

        }

        @Override

        public int findBookPriceByIsbn(String isbn) {

            String hql="select b.price from Book b where b.isbn=?";

            Query q=getSession().createQuery(hql).setString(0, isbn);

            return (Integer) q.uniqueResult();

        }

     

        @Override

        public void updataBookStock(String isbn) {

            //验证书的库存是否足够

            String hql2="select b.stock from Book b where b.isbn=?";

            int stock=(Integer) getSession().createQuery(hql2).setString(0, isbn).uniqueResult();

            if (stock==0) {

                System.out.println("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=(Integer) getSession().createQuery(hql2).setString(0, username).uniqueResult();

            System.out.println(balance);

            if (balance<price) {

                System.out.println("余额不足");

            }

            int result=balance-price;

            String hql="update Account a set a.balance=? where a.username=?";

            getSession().createQuery(hql).setInteger(0, result).setString(1, username).executeUpdate();

            System.out.println("余额为"+result);

        }

     

    }

     

    注意:需要在spring的配置文件中添加自动扫描的路径

    <!-- 设置自动扫描的包-->

        <context:component-scan base-package="com.ssh.spring_hibernate"></context:component-scan>

     

    第二步写好service

    public interface BookShopService {

        public void purchase(String username,String isbn);

    }

     

     

    public interface Cashier {

        public void checkout(String username,List<String>isbn);

    }

     

    其实现类

    package com.ssh.spring_hibernate.service;

     

    import org.springframework.beans.factory.annotation.Autowired;

    import org.springframework.stereotype.Service;

     

    import com.ssh.spring_hibernate.dao.BookShopDao;

     

    @Service

    public class BookShopServiceImpl implements BookShopService{

        @Autowired

        private BookShopDao bookShopDao;

        

        @Override

        public void purchase(String username, String isbn) {

            int price =bookShopDao.findBookPriceByIsbn(isbn);

            bookShopDao.updataBookStock(isbn);

            bookShopDao.updateUserAccount(username, price);

        }

     

    }

     

    package com.ssh.spring_hibernate.service;

     

    import java.util.List;

     

    import org.springframework.beans.factory.annotation.Autowired;

    import org.springframework.stereotype.Service;

     

    @Service

    public class CashierImpl implements Cashier {

        @Autowired

        private BookShopService bookShopService;

        

        @Override

        public void checkout(String username, List<String> isbn) {

            for (String is : isbn) {

                bookShopService.purchase(username, is);

            }

            

        }

     

    }

     

    第三步写我们的测试类

    public class Go {

        

        private ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

        private BookShopService bookShopService=null;

        {

            bookShopService=ctx.getBean(BookShopService.class);

        }

        

        public void testDataSource () throws SQLException{

            DataSource d=ctx.getBean(DataSource.class);

            System.out.println(d.getConnection());

        }

        

        public void testBookShopService(){

            bookShopService.purchase("aa", "1002");

        }

        public static void main(String[] args) throws SQLException {

            new Go().testBookShopService();

        }

    }

     

     

    控制台打印

    Hibernate:

    select

    book0_.PRICE as col_0_0_

    from

    SH_BOOK book0_

    where

    book0_.ISBN=?

    Hibernate:

    select

    book0_.STOCK as col_0_0_

    from

    SH_BOOK book0_

    where

    book0_.ISBN=?

    Hibernate:

    update

    SH_BOOK

    set

    STOCK=STOCK-1

    where

    ISBN=?

    Hibernate:

    select

    account0_.BALANCE as col_0_0_

    from

    SH_ACCOUNT account0_

    where

    account0_.USER_NAME=?

    230

    Hibernate:

    update

    SH_ACCOUNT

    set

    BALANCE=?

    where

    USER_NAME=?

    余额为160

     

     

    Spring Hibernate 事务的流程

    1. 在方法之前
      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

    1. 使和当前线程绑定的Session解除绑定
    2. 关闭Session
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  • 原文地址:https://www.cnblogs.com/chengzhipcx/p/4768866.html
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