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TransactionDefinition transactionDefinition = new DefaultTransactionAttribute(TransactionDefinition.PROPAGATION_REQUIRED);
new TransactionTemplate(transactionManager, transactionDefinition).execute(new TransactionCallback()
{
    @Override
    public Object doInTransaction(TransactionStatus status)
    {
        // ... execute transactional code ...

        return null;
    }
});


TransactionDefinition.PROPAGATION_REQUIRED： 已经在事务中，则参与，否则另起一个事务
transactionManager：org.springframework.transaction.PlatformTransactionManager 可以从容器中，得到