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本文链接:https://blog.csdn.net/weixin_44580977/article/details/97617629
将上一篇XML置方式,该成注解配置
dao层实现类
/**
* 账户的持久层实现类
*/
@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("结果集不唯一");
}
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());
}
}
业务层实现类
/**
* 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)//只读型事务的配置
public class AccountServiceImpl implements IAccountService{
@Autowired
private IAccountDao accountDao;
@Override
public Account findAccountById(Integer accountId) {
return accountDao.findAccountById(accountId);
}
//需要的是读写型事务配置
@Transactional(propagation= Propagation.REQUIRED,readOnly=false)
@Override
public void transfer(String sourceName, String targetName, Float money) {
System.out.println("transfer....");
//2.1根据名称查询转出账户
Account source = accountDao.findAccountByName(sourceName);
//2.2根据名称查询转入账户
Account target = accountDao.findAccountByName(targetName);
//2.3转出账户减钱
source.setMoney(source.getMoney()-money);
//2.4转入账户加钱
target.setMoney(target.getMoney()+money);
//2.5更新转出账户
accountDao.updateAccount(source);
int i=1/0;
//2.6更新转入账户
accountDao.updateAccount(target);
}
}
XML注解配置约束
<?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:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
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">
<!-- 配置spring创建容器时要扫描的包-->
<context:component-scan base-package="com.itheima"></context:component-scan>
<!-- 配置JdbcTemplate-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 配置数据源-->
<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/eesy"></property>
<property name="username" value="root"></property>
<property name="password" value="1234"></property>
</bean>
<!-- spring中基于注解 的声明式事务控制配置步骤
1、配置事务管理器
2、开启spring对注解事务的支持
3、在需要事务支持的地方使用@Transactional注解
-->
<!-- 配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 开启spring对注解事务的支持-->
<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>
</beans>