传播行为<br>
PROPAGATION_REQUIRED<br>
PROPAGATION_SUPPORTS
PROPAGATION_REQUIRES_NEW<br>
PROPAGATION_NOT_SUPPORTED<br>
PROPAGATION_NEVER<br>
PROPAGATION_NESTED<br>
PROPAGATION_MANDATORY<br>
隔离级别<br>
ISOLATION_DEFAULT: 默认<br>
ISOLATION_READ_UNCOMMITTED: 读未提交<br>
ISOLATION_READ_COMMITTED: 读已提交<br>
ISOLATION_REPEATABLE_READ: 可重复读<br>
ISOLATION_SERIALIZABLE: 串行化<br>
