Spring5（19）- 基於註解的事務控制

1 DAO

/**
 * 賬戶的持久層實現類
 */
@Repository("accountDao")
public class AccountDaoImpl  implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = jdbcTemplate.query(
                "select * from account where id = ?",
                new BeanPropertyRowMapper<Account>(Account.class), accountId);
        return accounts.isEmpty() ? null : accounts.get(0);
    }

    @Override
    public Account findAccountByName(String accountName) {
        List<Account> accounts = jdbcTemplate.query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("結果集不唯一");
        }
        return accounts.get(0);
    }

    @Override
    public void updateAccount(Account account) {
        jdbcTemplate.update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }

}

2 Service

@Service("accountService")
@Transactional
public class AccountServiceImpl implements IAccountService {

    @Autowired
    private IAccountDao accountDao;

    @Override
    public Account findAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);

    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer....");
        //2.1根據名稱查詢轉出賬戶
        Account source = accountDao.findAccountByName(sourceName);
        //2.2根據名稱查詢轉入賬戶
        Account target = accountDao.findAccountByName(targetName);
        //2.3轉出賬戶減錢
        source.setMoney(source.getMoney() - money);
        //2.4轉入賬戶加錢
        target.setMoney(target.getMoney() + money);
        //2.5更新轉出賬戶
        accountDao.updateAccount(source);

        //   int i = 1 / 0;

        //2.6更新轉入賬戶
        accountDao.updateAccount(target);
    }
}

3 bean.xml

<?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:aop="http://www.springframework.org/schema/aop"
       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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd"> <!-- bean definitions here -->

    <!--配置spring創建容器時掃描的包-->
    <context:component-scan base-package="com.tzb"></context:component-scan>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置數據源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring5?userSSL=false"></property>
        <property name="user" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

    <!--sprig中基於 xml 聲明式事務控制 步驟
        1.配置事務管理器
        2.開啓 spring 對註解事務的支持
        3.在需要事務支持的地方使用 @Transactional
    -->

    <!--配置事務管理器-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--開啓spring對註解事務的支持-->
    <tx:annotation-driven transaction-manager="txManager"></tx:annotation-driven>
</beans>

3.1 單元測試

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:bean.xml")
public class AccountServiceTest {

    @Autowired
    private IAccountService as;

    @Test
    public void testTransfer(){
        as.transfer("Mike","Jenny",100f);
    }

}