【Spring】基于全注解的Spring的声明式事务控制

Dao

package com.itheima.dao.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import javax.sql.DataSource;
import java.util.List;

@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()||accounts==null){
return null;
}
if(accounts.size()>1){
throw new RuntimeException("结果集不唯一");
}
return accounts.get(0);
}

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

}
}

Service

package com.itheima.service.impl;

import com.itheima.dao.IAccountDao;
import com.itheima.domain.Account;
import com.itheima.service.IAccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

/**
* 账户的业务层实现类
*
* 事务控制应该都是在业务层
*/
@Service("accountService")
@Transactional(propagation = Propagation.SUPPORTS,readOnly = true)
public class AccountServiceImpl implements IAccountService{
@Autowired
private IAccountDao accountDao;

//对单个方法进行配置，让有增删改的事务的readOnly改变。
@Transactional(propagation = Propagation.REQUIRED,readOnly = false)
public void transfer(String sourceName, String targetName, Float money) {
Account source = accountDao.findAccountByName(sourceName);
Account target = accountDao.findAccountByName(targetName);
source.setMoney(source.getMoney()-money);
target.setMoney(target.getMoney()+money);
accountDao.updateAccountByName(source);
int i=1/0;
accountDao.updateAccountByName(target);
}
}

config

• 主配置类 SpringConfiguration

package config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@ComponentScan("com.itheima")
@Import({JdbcConfig.class,TransactionConfig.class})
@PropertySource("classpath:jdbcConfig.properties")
@EnableTransactionManagement
public class SpringConfiguration {
}

• JdbcConfig

package config;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import javax.sql.DataSource;

/**
* 和连接数据库相关的配置类
*/
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;
/**
* 创建jdbcTemplate
*/
@Bean(name="jdbcTemplate")
public JdbcTemplate createJdbcTemplate(DataSource dataSource){
return new JdbcTemplate(dataSource);
}
@Bean(name = "dataSource")
public DataSource createDataSource (){
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
driverManagerDataSource.setDriverClassName(driver);
driverManagerDataSource.setUrl(url);
driverManagerDataSource.setUsername(username);
driverManagerDataSource.setPassword(password);
return driverManagerDataSource;
}
}

• TransactionConfig

package config;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import javax.sql.DataSource;
/**
* 和事务相关的配置类
*/
public class TransactionConfig {
/**
* 用于创建事务管理器对象
*/
@Bean(name = "transactionManager")
public PlatformTransactionManager createTransactionManager(DataSource dataSource){
return new DataSourceTransactionManager(dataSource);
}
}

resource

• jdbcConfig.properties

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

test

package com.itheima.test;

import com.itheima.service.IAccountService;
import config.SpringConfiguration;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfiguration.class)
public class AccountServiceTest {
@Autowired
private  IAccountService accountService;
@Test
public  void testTransfer(){
accountService.transfer("aaa","bbb",100f);
}
}