zoukankan html css js c++ java

注解的形式与xml文件的形式完成事务管理及xml文件的配置

需要的jar包:

c3p0-0.9.2.1.jar
com.springsource.net.sf.cglib-2.2.0.jar
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
commons-logging-1.1.3.jar
mchange-commons-java-0.2.3.4.jar
mysql-connector-java-5.0.8-bin.jar
spring-aop-4.2.2.RELEASE.jar
spring-beans-4.2.2.RELEASE.jar
spring-context-4.2.2.RELEASE.jar
spring-core-4.2.2.RELEASE.jar
spring-expression-4.2.2.RELEASE.jar
spring-jdbc-4.2.2.RELEASE.jar
spring-tx-4.2.2.RELEASE.jar

1.注解方式的XML文件配置:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:tx="http://www.springframework.org/schema/tx"
 6     xsi:schemaLocation="http://www.springframework.org/schema/beans
 7         http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context
 9         http://www.springframework.org/schema/context/spring-context.xsd
10         http://www.springframework.org/schema/tx
11         http://www.springframework.org/schema/tx/spring-tx.xsd">
12         
13     <!-- 包扫描 -->
14     <context:component-scan base-package="com.eduask.liusheng"/>
15     
16        <!-- 引入属性文件 -->
17        <context:property-placeholder location="db.properties"/>
18        
19     <!-- 配置数据源  -->
20     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
21         <property name="driverClass" value="${jdbc.driver}"></property>
22         <property name="jdbcUrl" value="${jdbc.url}"></property>
23            <property name="user" value="${jdbc.username}"></property>
24            <property name="password" value="${jdbc.password}"></property>
25     </bean>   
26       
27     <!-- 配置jdbcTemplate模版 -->  
28     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
29         <property name="dataSource" ref="dataSource"></property>
30     </bean>
31     
32     <!-- 配置事务管理器 -->
33     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
34         <property name="dataSource" ref="dataSource"></property>
35     </bean>
36     
37     <!-- 开启事务管理驱动 -->
38     <tx:annotation-driven transaction-manager="transactionManager"/>
39 </beans>

 1 public interface BookShopDao {
 2     /**
 3      * 根据isbn查找单价
 4      * @param isbn 编号
 5      * @return
 6      */
 7     public int findBookPriceByIsbn(String isbn);
 8     
 9     /**
10      * 修改库存
11      * @param isbn 编号
12      */
13     public void updateBookStock(String isbn);
14     
15     /**
16      * 修改账户余额
17      * @param username 用户名
18      * @param price 价格
19      */
20     public void updateAccount(String username,int price);
21     
22 }

BookShopDao.java

 1 import org.springframework.beans.factory.annotation.Autowired;
 2 import org.springframework.jdbc.core.JdbcTemplate;
 3 import org.springframework.stereotype.Repository;
 4 
 5 @Repository("bookShopDao")
 6 public class BookShopDaoImp implements BookShopDao {
 7     @Autowired
 8     private JdbcTemplate jdbcTemplate;
 9     
10     public int findBookPriceByIsbn(String isbn) {
11         String sql="select price from book where isbn=?";
12         int price=jdbcTemplate.queryForObject(sql, Integer.class, isbn);
13         return price;
14     }
15 
16     public void updateBookStock(String isbn) {
17         String sql="select stock from book_stock where isbn=?";
18         int stock=jdbcTemplate.queryForObject(sql, Integer.class, isbn);
19         if (stock>0) {
20             sql="update book_stock set stock=stock-1 where isbn=?";
21             jdbcTemplate.update(sql, isbn);
22         } else {
23             throw new RuntimeException("库存不足!");
24         }
25     }
26 
27     @Override
28     public void updateAccount(String username, int price) {
29         String sql="select balance from account where username=?";
30         int balance=jdbcTemplate.queryForObject(sql, Integer.class, username);
31         if (balance>=price) {
32             sql="update account set balance=balance-? where username=?";
33             jdbcTemplate.update(sql, price,username);
34         } else {
35             throw new RuntimeException("余额不足!");
36         }
37     }
38 
39 }

BookShopDaoImp.java

1 public interface BookShopService {
2     /**
3      * 购买功能
4      * @param username 用户名
5      * @param isbn 书编号
6      */
7     public void purchase(String username,String isbn);
8 }

BookShopService.java

 1 import org.springframework.beans.factory.annotation.Autowired;
 2 import org.springframework.stereotype.Service;
 3 import org.springframework.transaction.annotation.Isolation;
 4 import org.springframework.transaction.annotation.Propagation;
 5 import org.springframework.transaction.annotation.Transactional;
 6 
 7 import com.eduask.liusheng.dao.BookShopDao;
 8 @Service("bookShopService")
 9 public class BookShopServiceImp implements BookShopService {
10     @Autowired
11     private BookShopDao bookShopDao;
12     
13     @Transactional(propagation=Propagation.REQUIRES_NEW,timeout=3)
14     public void purchase(String username, String isbn) {
15     
16         //1.根据编号查询价格
17         int    price=bookShopDao.findBookPriceByIsbn(isbn);
18         
19         //2.修改库存
20         bookShopDao.updateBookStock(isbn);
21         //测试超时
22 //        try {
23 //            Thread.sleep(8000);
24 //        } catch (InterruptedException e) {
25 //            // TODO Auto-generated catch block
26 //            e.printStackTrace();
27 //        }
28             
29         //3.修改余额
30         bookShopDao.updateAccount(username, price);
31     
32     }
33 
34 }

BookShopServiceImp.java

 1 import java.util.List;
 2 
 3 public interface BookShopCashier {
 4     /**
 5      * 结账
 6      * @param isbns
 7      * @param username
 8      */
 9     public void checkOut(List<String> isbns,String username);
10 }

BookShopCashier.java

 1 import java.util.List;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Service;
 5 import org.springframework.transaction.annotation.Transactional;
 6 @Service("bookShopCashier")
 7 public class BookShopCashierImp implements BookShopCashier {
 8     @Autowired
 9     private BookShopService bookShopService;
10     
11     @Transactional
12     public void checkOut(List<String> isbns, String username){
13         for (String isbn : isbns) {
14             bookShopService.purchase(username, isbn);
15         }
16     }
17 
18 }

BookShopCashierImp.java

@Transactional(属性)

传播行为propagation 常用REQUIRES_NEW与REQUIRED

隔离事务isolation 默认READ_COMMITTED 拓展并发事务引起的问题,脏读.不可重复度,幻读

rollbackFor 和noRollbackFor 设置回滚与不回滚默认RunTimeException自动回滚,checked的异常不回滚

timeout 设置超时时间,单位s

2.xml方式的xml文件配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xmlns:tx="http://www.springframework.org/schema/tx"
 7     xsi:schemaLocation="http://www.springframework.org/schema/beans
 8         http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/context
10         http://www.springframework.org/schema/context/spring-context.xsd
11         http://www.springframework.org/schema/tx
12         http://www.springframework.org/schema/tx/spring-tx.xsd
13         http://www.springframework.org/schema/aop
14         http://www.springframework.org/schema/aop/spring-aop.xsd">
15         
16     <bean id="bookShopDao" class="com.eduask.liusheng.dao.BookShopDaoImp" autowire="byName"/>
17     
18     <bean id="bookShopService" class="com.eduask.liusheng.service.BookShopServiceImp" autowire="byName"/>
19     
20     <bean id="bookShopCashier" class="com.eduask.liusheng.service.BookShopCashierImp" autowire="byName"/>
21     
22        <!-- 引入属性文件 -->
23        <context:property-placeholder location="db.properties"/>
24        
25     <!-- 配置数据源  -->
26     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
27         <property name="driverClass" value="${jdbc.driver}"></property>
28         <property name="jdbcUrl" value="${jdbc.url}"></property>
29            <property name="user" value="${jdbc.username}"></property>
30            <property name="password" value="${jdbc.password}"></property>
31     </bean>   
32       
33     <!-- 配置jdbcTemplate模版 -->  
34     <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
35         <property name="dataSource" ref="dataSource"></property>
36     </bean>
37     
38     <!-- 配置事务管理器 -->
39     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
40         <property name="dataSource" ref="dataSource"></property>
41     </bean>
42     
43     <!-- 配置事务通知 -->
44     <tx:advice id="advice" transaction-manager="transactionManager">
45         <!-- 
46         name 方法名 
47         propagation 传播属性：REQUIRES_NEW，REQUIRED 事务被挂起的时间不计入超时时间
48         isolation 隔离事务级别 MySQL4种，Oracle2种
49         timeout 超时时间 ：-1永不超时，单位s；防止长期运行的事务占用资源
50         no-rollback-for 不回滚 （异常名）
51         rollback-for 回滚
52         任何 RuntimeException 将触发事务回滚，但是任何 checked Exception 将不触发事务回滚 
53         read-only 只读属性：表示这个事务只读取数据但不更新数据, 这样可以帮助数据库引擎优化事务
54         -->
55         <tx:attributes>
56             <tx:method name="purchase" propagation="REQUIRED" isolation="READ_COMMITTED" />
57             <tx:method name="checkOut" propagation="REQUIRED" isolation="READ_COMMITTED" timeout="3"/>
58             <!-- 增删改方法 -->
59             <tx:method name="save*" propagation="REQUIRED" isolation="DEFAULT" read-only="false"/>
60             <tx:method name="update*" propagation="REQUIRED" isolation="DEFAULT" read-only="false"/>
61             <tx:method name="delete*" propagation="REQUIRED" isolation="DEFAULT" read-only="false"/>
62             <!-- 查询方法只读 -->
63             <tx:method name="*" read-only="true"/>
64         </tx:attributes>
65     </tx:advice>
66     
67     <!-- 配置切点 -->
68     <aop:config>
69         <!-- 配置切点 -->
70         <aop:pointcut expression="execution(* com.eduask.liusheng.service.*.*(..))" id="pointcut"/>
71         <!-- 关联切点与通知 -->
72         <aop:advisor advice-ref="advice" pointcut-ref="pointcut"/>
73     </aop:config>
74     
75 </beans>

 1 import org.springframework.jdbc.core.JdbcTemplate;
 2 
 3 public class BookShopDaoImp implements BookShopDao {
 4     
 5     private JdbcTemplate jdbcTemplate;
 6     
 7     public JdbcTemplate getJdbcTemplate() {
 8         return jdbcTemplate;
 9     }
10 
11     public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
12         this.jdbcTemplate = jdbcTemplate;
13     }
14 
15     public int findBookPriceByIsbn(String isbn) {
16         String sql="select price from book where isbn=?";
17         int price=jdbcTemplate.queryForObject(sql, Integer.class, isbn);
18         return price;
19     }
20 
21     public void updateBookStock(String isbn) {
22         String sql="select stock from book_stock where isbn=?";
23         int stock=jdbcTemplate.queryForObject(sql, Integer.class, isbn);
24         if (stock>0) {
25             sql="update book_stock set stock=stock-1 where isbn=?";
26             jdbcTemplate.update(sql, isbn);
27         } else {
28             throw new RuntimeException("库存不足!");
29         }
30     }
31 
32     
33     public void updateAccount(String username, int price) {
34         String sql="select balance from account where username=?";
35         int balance=jdbcTemplate.queryForObject(sql, Integer.class, username);
36         if (balance>=price) {
37             sql="update account set balance=balance-? where username=?";
38             jdbcTemplate.update(sql, price,username);
39         } else {
40             throw new RuntimeException("余额不足!");
41         }
42     }
43 
44 }

BookShopDaoImp.java

 1 import com.eduask.liusheng.dao.BookShopDao;
 2 
 3 public class BookShopServiceImp implements BookShopService {
 4 
 5     private BookShopDao bookShopDao;
 6     
 7     public BookShopDao getBookShopDao() {
 8         return bookShopDao;
 9     }
10 
11     public void setBookShopDao(BookShopDao bookShopDao) {
12         this.bookShopDao = bookShopDao;
13     }
14 
15     public void purchase(String username, String isbn) {
16     
17         //1.根据编号查询价格
18         int    price=bookShopDao.findBookPriceByIsbn(isbn);
19         
20         //2.修改库存
21         bookShopDao.updateBookStock(isbn);
22         
23         try {
24             Thread.sleep(8000);
25         } catch (InterruptedException e) {
26             // TODO Auto-generated catch block
27             e.printStackTrace();
28         }
29             
30         //3.修改余额
31         bookShopDao.updateAccount(username, price);
32     
33     }
34 
35 }

BookShopServiceImp.java

 1 import java.util.List;
 2 
 3 public class BookShopCashierImp implements BookShopCashier {
 4     
 5     private BookShopService bookShopService;
 6     
 7     public BookShopService getBookShopService() {
 8         return bookShopService;
 9     }
10 
11     public void setBookShopService(BookShopService bookShopService) {
12         this.bookShopService = bookShopService;
13     }
14 
15     public void checkOut(List<String> isbns, String username){
16         for (String isbn : isbns) {
17             bookShopService.purchase(username, isbn);
18         }
19     }
20 
21 }

BookShopCashierImp.java

查看全文

相关阅读:
第三章感想
 第二章感想
 第一章感想
 第9章硬件抽象层：HAL
第10章嵌入式linux的调试技术
 第8章蜂鸣器驱动
 第七章 I/O
第六章编写Linux驱动程序
 第五章 S3C6410
源代码的下载和编译

原文地址：https://www.cnblogs.com/qq634571685/p/7168988.html