spring配置事务里面这句话是什么意思?

spring配置事务里面这句话是什么意思?

所有方式只读...
    <!-- 事务属性配置 -->      <tx:advice id="txAdvice" transaction-manager="H4TxManager">          <tx:attributes>              <!-- 方法对应的传播属性 -->              <tx:method name="save*" propagation="REQUIRED" />              <tx:method name="add*" propagation="REQUIRED" />              <tx:method name="create*" propagation="REQUIRED" />              <tx:method name="insert*" propagation="REQUIRED" />              <tx:method name="update*" propagation="REQUIRED" />              <tx:method name="merge*" propagation="REQUIRED" />              <tx:method name="del*" propagation="REQUIRED" />              <tx:method name="remove*" propagation="REQUIRED" />              <tx:method name="put*" propagation="REQUIRED" />              <tx:method name="use*" propagation="REQUIRED"/>  
.以上权限高（新增,修改,删除什么的）
            <tx:method name="get*" propagation="REQUIRED" read-only="true" />              <tx:method name="count*" propagation="REQUIRED" read-only="true" />              <tx:method name="find*" propagation="REQUIRED" read-only="true" />              <tx:method name="list*" propagation="REQUIRED" read-only="true" />              <tx:method name="*" read-only="true" />  
.以上的只读权限(统计,显示.)
        </tx:attributes>      </tx:advice>      <!-- 事务控制位置,一般在业务层service -->      <aop:config>          <aop:pointcut id="txPointcut" expression="execution(* com.genius.service..*.*(..))" />          <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>      </aop:config>
我公司的实例配置