@Service
public class UserService {
@Autowired
private UserRepository userRepository;
@Transactional
public void transferMoney(String fromUser, String toUser, double amount) {
User from = userRepository.findByUsername(fromUser);
User to = userRepository.findByUsername(toUser);
from.setBalance(from.getBalance() - amount);
userRepository.save(from);
to.setBalance(to.getBalance() + amount);
userRepository.save(to);
}
}
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mydb"/>
<property name="username" value="root"/>
<property name="password" value="password"/>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
