Aop-Transaction事物

事物注解：@Transactional

事物举例：

sql：

DROP TABLE IF EXISTS `account`;
CREATE TABLE `account` (
`username` varchar(255) NOT NULL,
`balance` int(11) DEFAULT NULL,
PRIMARY KEY (`username`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

-- ----------------------------
-- Records of account
-- ----------------------------
INSERT INTO `account` VALUES ('Tom', '100');

-- ----------------------------
-- Table structure for book
-- ----------------------------
DROP TABLE IF EXISTS `book`;
CREATE TABLE `book` (
`isbn` varchar(255) NOT NULL,
`book_name` varchar(255) DEFAULT NULL,
`price` int(11) DEFAULT NULL,
PRIMARY KEY (`isbn`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

-- ----------------------------
-- Records of book
-- ----------------------------
INSERT INTO `book` VALUES ('0001', 'Java', '50');

-- ----------------------------
-- Table structure for book_stock
-- ----------------------------
DROP TABLE IF EXISTS `book_stock`;
CREATE TABLE `book_stock` (
`isbn` varchar(255) NOT NULL,
`stock` int(11) DEFAULT NULL,
PRIMARY KEY (`isbn`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

-- ----------------------------
-- Records of book_stock
-- ----------------------------
INSERT INTO `book_stock` VALUES ('0001', '10');
INSERT INTO `book_stock` VALUES ('0002', '10');

(1)引入依赖

 1  <dependencies>
 2     <dependency>
 3       <groupId>org.springframework</groupId>
 4       <artifactId>spring-webmvc</artifactId>
 5       <version>5.2.9.RELEASE</version>
 6     </dependency>
 7     <dependency>
 8       <groupId>mysql</groupId>
 9       <artifactId>mysql-connector-java</artifactId>
10       <version>8.0.25</version>
11     </dependency>
12     <!--切面依赖-->
13     <dependency>
14       <groupId>org.springframework</groupId>
15       <artifactId>spring-aspects</artifactId>
16       <version>5.2.9.RELEASE</version>
17     </dependency>
18 
19     <!--jdbc依赖-->
20     <dependency>
21       <groupId>org.springframework</groupId>
22       <artifactId>spring-jdbc</artifactId>
23       <version>5.2.9.RELEASE</version>
24     </dependency>
25 
26     <dependency>
27       <groupId>org.mybatis</groupId>
28       <artifactId>mybatis-spring</artifactId>
29       <version>2.0.6</version>
30     </dependency>
31     <dependency>
32       <groupId>org.mybatis</groupId>
33       <artifactId>mybatis</artifactId>
34       <version>3.5.7</version>
35     </dependency>
36 
37     <dependency>
38       <groupId>com.alibaba</groupId>
39       <artifactId>druid</artifactId>
40       <version>1.2.8</version>
41     </dependency>
42 
43 
44 
45   </dependencies>

(2)spring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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<!--    扫包-->
    <context:component-scan base-package="com.qy143.service"/>
<!--    配置jdbc-->
    <bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/aoptransaction?serverTimezone=Asia/Shanghai"/>
        <property name="username" value="root"/>
        <property name="password" value="123@qwe"/>
<!--        最大连接数量，最小连接数量，等待时间-->
        <property name="maxActive" value="10"/>
        <property name="minIdle" value="3"/>
<!--        初始化连接数-->
        <property name="initialSize" value="5"/>
<!--        单位是毫秒-->
        <property name="maxWait" value="5000"/>
    </bean>

    <!--    把mybatis配置文件中的内容整合到spring中-->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

<!--    为指定包下的dao方法生成实现类-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.qy143.dao"/>
    </bean>

<!--  1.事物管理 理解为事物切面   -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
    </bean>
<!--    2.开启事物注解
       transaction-manager:可以省略 但是前提是你的事物管理的id必须是transactionManager(事物管理器)

        http://www.springframework.org/schema/tx
-->
    <tx:annotation-driven transaction-manager="transactionManager"/>
</beans>

(3)dao接口

public interface BookShopDao {
    /**
     * 根据图书编号查询图书价格
     * @param isbn
     * @return
     */
    public int findBookPriceByIsbn(String isbn);

    /**
     * 根据书得编号修改书得库存
     * @param isbn
     */
    public int updateBookStockByIsbn(String isbn);

    /**
     * 修改账号余额
     * @param username
     * @param money
     */
    public void updateAccount(@Param("username") String username,@Param("money") int money);

    /**
     * 查询库存
     * @param isbn
     * @return
     */
    int findBookStockByIsbn(String isbn);


    /**
     * 根据账号查询余额
     * @param username
     * @return
     */
    int findAccountBalanceByUsername(String username);
}

（4）dao得映射文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qy143.dao.BookShopDao">
<!--    根据书得编号修改书得库存-->
    <update id="updateBookStockByIsbn">
        update book_stock set stock=stock-1 where isbn=#{isbn}
    </update>
<!--    修改账号余额-->
    <update id="updateAccount">
        update account set balance=balance-#{money} where username=#{username}
    </update>

    <!--根据图书编号查询图书价格-->
    <select id="findBookPriceByIsbn" resultType="java.lang.Integer">
        select price from book where isbn=#{isbn}
    </select>
<!--    查询库存-->
    <select id="findBookStockByIsbn" resultType="java.lang.Integer">
        select stock from book_stock where isbn=#{isbn}
    </select>
<!--    根据账号查询余额-->
    <select id="findAccountBalanceByUsername" resultType="java.lang.Integer">
        select balance from Account where username=#{username}
    </select>
</mapper>

(5) service层得接口

public interface BookShopService {
    /**
     * 购买
     * @param isbn
     * @param  username
     */

    public void purchase(String isbn,String username);
}

(6)Service实现类

@Service("bookShopServiec")
public class BookShopServiceImpl implements BookShopService {

    @Autowired
    private BookShopDao bookShopDao;

    //rollbackFor:针对那种异常才会回滚.
    //noRollbackFor:哪些异常不回滚
    //readOnly:只读 针对查询功能 findById();
    //timeout:设置事物超时时间。单位为妙
    @Transactional(propagation = Propagation.REQUIRED,rollbackFor = SQLException.class)
    public void purchase(String isbn, String username) {
//        业务代码
//        1.根据书的编号查询书的价格
        int price = bookShopDao.findBookPriceByIsbn(isbn);
//        2.查询指定书的库存
        int stock = bookShopDao.findBookStockByIsbn(isbn);
        if (stock>0){
            //修改库存数量
            bookShopDao.updateBookStockByIsbn(isbn);
        }else {
            throw new RuntimeException("编号为"+isbn+"的库存不足");
        }
//      3.查询指定用户的余额
        int balance = bookShopDao.findAccountBalanceByUsername(username);
        if (balance>=price){
            //扣款
            bookShopDao.updateAccount(username,price);
        }else{
            throw new RuntimeException("账号为"+username+"的余额不足");
        }
    }
}

（7）测试类

public class Test {
    public static void main(String[] args) {
        ApplicationContext app =new ClassPathXmlApplicationContext("spring.xml");
        BookShopService bookShopServiec = (BookShopService)app.getBean("bookShopServiec");
        bookShopServiec.purchase("0001","Tom");
    }
}

posted on 2021-12-15 19:49 咸鱼乔阅读(32) 评论(0) 编辑收藏举报

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Aop-Transaction事物