純註解實現Spring聲明式事務控制

domain

/**
 * 賬戶的實體類
 */
public class Account implements Serializable {

    private Integer id;
    private String name;
    private Float money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

持久層

/**
 * 賬戶的持久層接口
 */
public interface IAccountDao {

    /**
     * 根據Id查詢賬戶
     * @param accountId
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 根據名稱查詢賬戶
     * @param accountName
     * @return
     */
    Account findAccountByName(String accountName);

    /**
     * 更新賬戶
     * @param account
     */
    void updateAccount(Account account);
}

=========================================================================================

/**
 * 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());
    }
}

業務層

/**
 * @Date 2019/8/2 - 17:16
 * <p>
 * 賬戶的業務層接口
 */
public interface IAccountService {
    /**
     * 根據id查找賬戶信息
     *
     * @param id
     * @return
     */
    Account findAccountById(Integer id);

    /**
     *
     * @param sourceName    轉出賬戶名稱
     * @param targetName    轉入賬戶名稱
     * @param money         金額
     */
    void transfer(String sourceName, String targetName, Float money);
}

=========================================================================================

/**
 * 賬戶的業務層實現類
 * <p>
 * 事務控制應該都是在業務層
 */
@Service("accountService")
@Transactional(propagation = Propagation.SUPPORTS, readOnly = true)
public class AccountServiceImpl implements IAccountService {
    @Autowired
    private IAccountDao accountDao;

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

    }

    @Override
    @Transactional(propagation = Propagation.REQUIRED, readOnly = false)
    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);
    }
}

配置類

/**
 * @Date 2019/8/1 - 14:34
 * 	
 * 主配置類
 */
@Configuration
@ComponentScan("com.sx")
@Import({JdbcConfig.class, TransactionConfig.class})
@PropertySource("classpath:jdbc.properties")
@EnableTransactionManagement
public class SpringConfiguration {
}

=========================================================================================
/**
 * 用與創建連接
 */
public class JdbcConfig {

    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;

    /**
     * 創建JdbcTemplate對象
     *
     * @param dataSource
     * @return
     */
    @Bean(name = "jdbcTemplate")
    @Scope("prototype")
    public JdbcTemplate createJdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

    /**
     * 創建數據源
     *
     * @return
     */
    @Bean(name = "dataSource")
    public DataSource createDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        try {
            dataSource.setDriverClassName(driver);
            dataSource.setUrl(url);
            dataSource.setUsername(username);
            dataSource.setPassword(password);
            return dataSource;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

=========================================================================================

/**
 * 事務相關的配置類
 */
public class TransactionConfig {

    /**
     * 用於創建事務管理器對象
     *
     * @param dataSource
     * @return
     */
    @Bean(name = "transactionManager")
    public PlatformTransactionManager createPlatformTransactionManager(DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

用於創建連接的配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/eesy_spring
jdbc.username=root
jdbc.password=123456

測試類

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest {

    @Autowired
    private IAccountService as;

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