Spring @Transactional 边界

使用Spring框架中的@Transactional注解可以更方便地管理事务，定义事务的边界以确保数据的一致性和完整性。本文将介绍@Transactional的用法，并通过一个案例代码来演示其具体应用。

java
@Service
public class BankAccountService {
    
    private BankAccountDao bankAccountDao;
    
    // 构造器注入BankAccountDao
    
    @Transactional
    public void transferMoney(String fromAccount, String toAccount, double amount) {
        double balance = bankAccountDao.getBalance(fromAccount);
        if (balance >= amount) {
            bankAccountDao.withdraw(fromAccount, amount);
            bankAccountDao.deposit(toAccount, amount);
        } else {
            throw new InsufficientBalanceException("余额不足");
        }
    }
    
    public double getBalance(String account) {
        return bankAccountDao.getBalance(account);
    }
}