Spring整合Hibernate的步骤

第一步、HIbernate部分

1、导入Hibernate的lib包

2、新建一个Hibernate的cfg文件

hibernate.cfg.xml

  
 
 
 
 
 
org.hibernate.dialect.Dialect

 true
 true 
 
 update
  

---

3、新建两个实体类

Account.java

package cn.spring.hibernate;

public class Account {
private int id; 
private String username;
private int account;
private int stock;
public int getId() {
	return id;
}
public void setId(int id) {
	this.id = id;
}
public String getUsername() {
	return username;
}
public void setUsername(String username) {
	this.username = username;
}
public int getAccount() {
	return account;
}
public void setAccount(int account) {
	this.account = account;
}
public void setStock(int stock) {
	this.stock = stock;
}
public int getStock() {
	return stock;
}
}

BookInfo.java

package cn.spring.hibernate;

public class BookInfo {
private int id;
private String bookname;
private String isbn;
private int price;
public int getId() {
	return id;
}
public void setId(int 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 void setPrice(int price) {
	this.price = price;
}
public int getPrice() {
	return price;
}

}

配置映射文件Account.hbm.xml

配置映射文件BookInfo.hbm.xml

---

4、在Spring的配置文件里面做如下的任务

4.1 、配置jdbc

4.2、配置hibernate的核心文件

4.3、配置持久类的映射文件

4.4、事务的声明

---

如下是具体的实现过程，

新建一个applicationContexts.xml

配置jdbc

新建一个db.properties

jdbc.username=root
jdbc.password=123456
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///lf

配置hibernate的核心文件和配置持久类的映射文件

---

测试类如下

package cn.com.text;
import java.sql.SQLException;

import javax.sql.DataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) {
	ApplicationContext ioc=new ClassPathXmlApplicationContext("applicationContexts.xml");
	DataSource  da=ioc.getBean(DataSource.class);
	try {
		System.out.println(da.getConnection());
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}

}
}

运行程序

结果：不报错，打开数据库，自动生成了两张表

注意：是运行程序自动生成的，不是我事先新建的表；

是    update起到作用的

---

在配置文件里面Spring对事务的声明

1、配置事务管理器

2、配置事务的属性

3、把切点和事务关联起来

疑问？为什么需要用到事务？为什么需要用到切面？？

解答：事务的目的就是保证可以让整个过程只有两个结果，全部失败或者全部成功，不存在有的完成了，有的没有完成

为什么用到切面，事务用到哪些包哪些方法，针对哪个类而言的，

配置文件的代码如下

---

现在就是接口和实现类了

BookShopDao.java

package cn.com.dao;
public interface BookShopDao {
     //根据书号获取书的单价
	public int findBookPriceByIsbn(String isbn);
	//更新书的库存，使得书号对应的库存-1
	public void updateBookStock(String isbn);
	//更新用户的账户余额，使得username的balance-price
	public void updateUserAccount(String username,int price);
}

 BookShopDaoImpl.java

package cn.com.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;
import cn.com.dao.exception.BookCountException;
import cn.com.dao.exception.BookStockException;
@Repository(value="bookShopDao")
public class BookShopDaoImpl implements BookShopDao {
	/*
	 * 在这里只能用hibernate,不能跟之前一样用的是底层的sql代码
	 * date:2018/12/27
	 */
	@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 sql = "SELECT b.price FROM BookInfo b WHERE b.isbn = ?";
		System.out.println("sql:"+sql);
		Query query = getSession().createQuery(sql);
		query.setString(0, isbn);
		int bi = (int) query.uniqueResult();
		System.out.println("hahah"+bi);
		return bi;
	}

	public void updateBookStock(String isbn) {
		// 首先看一下库存够不够
		String sql0 = "select stock from BookInfo where isbn = ?";
		int stock = (int) getSession().createQuery(sql0).setString(0, isbn)
				.uniqueResult();
		if (stock == 0) {
			throw new BookStockException("库存不足...");
		}
		// 查询库存
		String sql = "update BookInfo set stock = stock-1 where isbn = ?";
		getSession().createQuery(sql).setString(0, isbn).executeUpdate();
		
	}

	public void updateUserAccount(String username, int price) {
		// 首先看一下余额足不足
		String sql = "select account from Account where username = ?";
		int account = (int) getSession().createQuery(sql)
				.setString(0, username).uniqueResult();
		if (account < price) {
			throw new BookCountException("余额不足...");
		}
		// 扣除金额
		String sqls = "update Account set account = ? where username = ?";
		Query query=getSession().createQuery(sqls);
		query.setInteger(0, account-price);
		query.setString(1,username);
		query.executeUpdate();
	}

}

BookCountException.java

package cn.com.dao.exception;
public class BookCountException extends RuntimeException {

	public BookCountException() {
		super();
		// TODO Auto-generated constructor stub
	}

	public BookCountException(String message, Throwable cause,
			boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
		// TODO Auto-generated constructor stub
	}

	public BookCountException(String message, Throwable cause) {
		super(message, cause);
		// TODO Auto-generated constructor stub
	}

	public BookCountException(String message) {
		super(message);
		// TODO Auto-generated constructor stub
	}

	public BookCountException(Throwable cause) {
		super(cause);
		// TODO Auto-generated constructor stub
	}

}

BookStockException.java

package cn.com.dao.exception;
public class BookStockException extends RuntimeException{

	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
	}

}

BookShopList.java

package cn.com.dao.service;
import java.util.List;
public interface BookShopList {
public void getpurchare(String name,List isbns);
}

BookShopListImpl.java

package cn.com.dao.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
@Repository(value="list")
public class BookShopListImpl implements BookShopList {
	@Autowired
	private BookShopService bookShopService;
	public void getpurchare(String name, List isbns) {
		// TODO Auto-generated method stub
		for (String isbn : isbns) {
			bookShopService.purchase(name, isbn);
		}
	}

}

 BookShopService.java

package cn.com.dao.service;

public interface BookShopService {
public void purchase(String username,String isbn);
}

BookShopServiceImpl.java

package cn.com.dao.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Isolation;
import org.springframework.transaction.annotation.Transactional;
import cn.com.dao.BookShopDao;
@Repository(value="book")
public class BookShopServiceImpl implements BookShopService {
	@Autowired
	private BookShopDao bookShopDaoImpl;
/*	@Transactional(isolation=Isolation.READ_COMMITTED)*/
	public void purchase(String username, String isbn) {
		// 1.根据isbn来查询价格和库存
		int price = bookShopDaoImpl.findBookPriceByIsbn(isbn);
		// 2.更新库存
		bookShopDaoImpl.updateBookStock(isbn);
		// 3.扣除账户余额
		bookShopDaoImpl.updateUserAccount(username, price);

	}

}

最终版本的xml

测试类

package cn.com.dao.com;
import java.util.Arrays;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import cn.com.dao.service.BookShopList;
public class Test {
public static void main(String[] args) {
	      ApplicationContext ioc=new ClassPathXmlApplicationContext("applicationContext.xml");
	    /* 一个人买一本书
	     *  BookShopService bs=(BookShopService) ioc.getBean("book");
          bs.purchase("aa", "0102");
	     * */
	     
	      //一个人买多本书
	      BookShopList bp=(BookShopList) ioc.getBean("list");
	      bp.getpurchare("bb", Arrays.asList(new String[]{"0101","0102"}));
}
}

测试无误

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注意两个点

1、
             id="txAdvice">
        
            
            
            
        
    

和@Transactional(isolation=Isolation.READ_COMMITTED)

一个是基于xml的配置，另一个是注解的方式配置事务的属性

2、在类BookShopListImpl里面的方法名不可以是getpurchare，不然会报错，因为在配置文件里面有一个