package com.atguigu.spring.hibernate.dao;
public interface BookShopDao {
//根据书号获取书的单价
public int findBookPriceByIsbn(String isbn);
//更新数的库存. 使书号对应的库存 - 1
public void updateBookStock(String isbn);
//更新用户的账户余额: 使 username 的 balance - price
public void updateUserAccount(String username, int price);
}
package com.atguigu.spring.hibernate.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.atguigu.spring.hibernate.dao.BookShopDao;
import com.atguigu.spring.hibernate.exceptions.BookStockException;
import com.atguigu.spring.hibernate.exceptions.UserAccountException;
@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();
}
}
package com.atguigu.spring.hibernate.service;
public interface BookShopService {
public void purchase(String username, String isbn);
}
package com.atguigu.spring.hibernate.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.atguigu.spring.hibernate.dao.BookShopDao;
import com.atguigu.spring.hibernate.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
*/
@Override
public void purchase(String username, String isbn) {
int price = bookShopDao.findBookPriceByIsbn(isbn);
bookShopDao.updateBookStock(isbn);
bookShopDao.updateUserAccount(username, price);
}
}
package com.atguigu.spring.hibernate.service;
import java.util.List;
public interface Cashier {
public void checkout(String username, List isbns);
}
package com.atguigu.spring.hibernate.service.impl;
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 isbns) {
for(String isbn:isbns){
bookShopService.purchase(username, isbn);
}
}
}
package com.atguigu.spring.hibernate.exceptions;
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
}
}
package com.atguigu.spring.hibernate.exceptions;
public class UserAccountException extends RuntimeException{
/**
*
*/
private static final long serialVersionUID = 1L;
public UserAccountException() {
super();
// TODO Auto-generated constructor stub
}
public UserAccountException(String message, Throwable cause,
boolean enableSuppression, boolean writableStackTrace) {
super(message, cause, enableSuppression, writableStackTrace);
// TODO Auto-generated constructor stub
}
public UserAccountException(String message, Throwable cause) {
super(message, cause);
// TODO Auto-generated constructor stub
}
public UserAccountException(String message) {
super(message);
// TODO Auto-generated constructor stub
}
public UserAccountException(Throwable cause) {
super(cause);
// TODO Auto-generated constructor stub
}
}
package com.atguigu.spring.hibernate.entities;
public class Account {
private Integer id;
private String username;
private int balance;
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.atguigu.spring.hibernate.entities;
public class Book {
private Integer id;
private String bookName;
private String isbn;
private int price;
private int stock;
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;
}
}
package com.atguigu.spring.hibernate.test;
import java.sql.SQLException;
import java.util.Arrays;
import javax.sql.DataSource;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.atguigu.spring.hibernate.service.BookShopService;
import com.atguigu.spring.hibernate.service.Cashier;
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());
}
}
org.hibernate.dialect.MySQL5InnoDBDialect
true
true
update
org.hibernate.dialect.MySQL5InnoDBDialect
true
true
update
jdbc.user=root
jdbc.password=1230
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///spring7
jdbc.initPoolSize=5
jdbc.maxPoolSize=10
#...
