解惑 spring 嵌套事务与ejb事务

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1、解惑spring嵌套事务/***@author王政*@date2006-11-24*@note转载请注明出处*/在所有使用spring的应用中,声明式事务管理可能是使用率最高的功能了,但是,从我观察到的情况看,绝大多数人并不能深刻理解事务声明中不同事务传播属性配置的的含义,让我们来看一下TransactionDefinition接口中的定义代码/***Supportacurrenttransaction,createanewoneifnoneexists.*AnalogoustoEJBtransactionattributeofthesamename.*

Thisistypically

2、thedefaultsettingofatransactiondefinition.*/intPROPAGATION_REQUIRED=0;/***Supportacurrenttransaction,executenon-transactionallyifnoneexists.*AnalogoustoEJBtransactionattributeofthesamename.*

Note:Fortransactionmanagerswithtransactionsynchronization,*PROPAGATION_SUPPORTSisslightlydifferentfromnot

3、ransactionatall,*asitdefinesatransactionscoppthatsynchronizationwillapplyfor.*Asaconsequence,thesameresources(JDBCConnection,HibernateSession,etc)*willbesharedfortheentirespecifiedscope.Notethatthisdependson*theactualsynchronizationconfigurationofthetransactionmanager.*@seeorg.springframework.tran

4、saction.support.AbstractPlatformTransactionManager#setTransactionSynchronization*/intPROPAGATION_SUPPORTS=1;/***Supportacurrenttransaction,throwanexceptionifnoneexists.*AnalogoustoEJBtransactionattributeofthesamename.*/intPROPAGATION_MANDATORY=2;/***Createanewtransaction,suspendthecurrenttransacti

5、onifoneexists.*AnalogoustoEJBtransactionattributeofthesamename.*

Note:Actualtransactionsuspensionwillnotworkonout-of-the-box*onalltransactionmanagers.ThisinparticularappliestoJtaTransactionManager,*whichrequiresthejavax.transaction.TransactionManagertobe*madeavailableittoit(whichiss

6、erver-specificinstandardJ2EE).*@seeorg.springframework.transaction.jta.JtaTransactionManager#setTransactionManager*/intPROPAGATION_REQUIRES_NEW=3;/***Executenon-transactionally,suspendthecurrenttransactionifoneexists.*AnalogoustoEJBtransactionattributeofthesamename.*

Note:Actualtransactionsuspen

7、sionwillnotworkonout-of-the-box*onalltransactionmanagers.ThisinparticularappliestoJtaTransactionManager,*whichrequiresthejavax.transaction.TransactionManagertobe*madeavailableittoit(whichisserver-spe