Spring5（21）- 基於編程式事務控制【瞭解】

1 DAO

public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao {

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = super.getJdbcTemplate().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 = super.getJdbcTemplate().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) {
        super.getJdbcTemplate().update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }
}

2 Service

public class AccountServiceImpl implements IAccountService {

    private IAccountDao accountDao;

    private TransactionTemplate transactionTemplate;

    public void setTransactionTemplate(TransactionTemplate transactionTemplate) {
        this.transactionTemplate = transactionTemplate;
    }

    public void setAccountDao(IAccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account findAccountById(final Integer accountId) {

        return transactionTemplate.execute(new TransactionCallback<Account>() {
            @Override
            public Account doInTransaction(TransactionStatus transactionStatus) {
                return accountDao.findAccountById(accountId);
            }
        });

    }

    @Override
    public void transfer(final String sourceName, final String targetName, final Float money) {

        transactionTemplate.execute(new TransactionCallback<Object>() {
            @Override
            public Object doInTransaction(TransactionStatus transactionStatus) {
                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);
                return null;
            }
        });

    }
}

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 -->


    <!-- 配置業務層-->
    <bean id="accountService" class="com.tzb.service.impl.AccountServiceImpl">
        <property name="accountDao" ref="accountDao"></property>
        <property name="transactionTemplate" ref="transactionTemplate"></property>
    </bean>

    <!-- 配置賬戶的持久層-->
    <bean id="accountDao" class="com.tzb.dao.impl.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"></property>
    </bean>


    <!-- 配置數據源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/spring5?userSSL=false"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>

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

    <!--配置事務模板對象-->
    <bean id="transactionTemplate" class="org.springframework.transaction.support.TransactionTemplate">
        <property name="transactionManager" ref="txManager"></property>
    </bean>

</beans>

4 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);
    }

}