數(shù)據(jù)庫引擎不支持事務(wù)

在MySQL數(shù)據(jù)庫中有幾種引擎(InnoDB,MyISAM,Memory等等),僅僅InnoDB支持事務(wù),如果數(shù)據(jù)庫底層都不支持事務(wù)的話,那么再怎么折騰都是白搭.

@transactional加在private方法上

@Transactional只能加在public方法上,如果需要在private方法中加入事務(wù),可以使用Aspect配transactionManager使用.

本類方法調(diào)本類另一個方法

例如:

@Servicepublic class UserServiceImpl implements UserService { @Transactional public void update(User user) { //check updateUserInfo(user); } @Transactional(propagation = Propagation.REQUIRES_NEW) public void updateUser(User user) { // update user }}

@Transactional(propagation = Propagation.REQUIRES_NEW)是無效的,在Spring中是使用代理的方式實現(xiàn)事務(wù),發(fā)生自身調(diào)用的時候,沒有經(jīng)過Spring的代理,自然事務(wù)失效.

不支持事務(wù)

@Servicepublic class UserServiceImpl implements UserService { @Transactional(propagation = Propagation.NOT_SUPPORTED) public void update(User user) { //do some action }}

@Transactional(propagation = Propagation.NOT_SUPPORTED)表示如果當(dāng)前存在事務(wù)就掛起,以沒有事務(wù)的方式運行,主動不支持事務(wù)了,那么再怎么操作也是白搭. 此處貼下Spring的傳播行為:

/** * Support a current transaction, create a new one if none exists. * Analogous to EJB transaction attribute of the same name. * <p>This is the default setting of a transaction annotation. */ REQUIRED(TransactionDefinition.PROPAGATION_REQUIRED), /** * Support a current transaction, execute non-transactionally if none exists. * Analogous to EJB transaction attribute of the same name. * <p>Note: For transaction managers with transaction synchronization, * PROPAGATION_SUPPORTS is slightly different from no transaction at all, * as it defines a transaction scope that synchronization will apply for. * As a consequence, the same resources (JDBC Connection, Hibernate Session, etc) * will be shared for the entire specified scope. Note that this depends on * the actual synchronization configuration of the transaction manager. * @see org.springframework.transaction.support.AbstractPlatformTransactionManager#setTransactionSynchronization */ SUPPORTS(TransactionDefinition.PROPAGATION_SUPPORTS), /** * Support a current transaction, throw an exception if none exists. * Analogous to EJB transaction attribute of the same name. */ MANDATORY(TransactionDefinition.PROPAGATION_MANDATORY), /** * Create a new transaction, and suspend the current transaction if one exists. * Analogous to the EJB transaction attribute of the same name. * <p><b>NOTE:</b> Actual transaction suspension will not work out-of-the-box * on all transaction managers. This in particular applies to * {@link org.springframework.transaction.jta.JtaTransactionManager}, * which requires the {@code javax.transaction.TransactionManager} to be * made available to it (which is server-specific in standard Java EE). * @see org.springframework.transaction.jta.JtaTransactionManager#setTransactionManager */ REQUIRES_NEW(TransactionDefinition.PROPAGATION_REQUIRES_NEW), /** * Execute non-transactionally, suspend the current transaction if one exists. * Analogous to EJB transaction attribute of the same name. * <p><b>NOTE:</b> Actual transaction suspension will not work out-of-the-box * on all transaction managers. This in particular applies to * {@link org.springframework.transaction.jta.JtaTransactionManager}, * which requires the {@code javax.transaction.TransactionManager} to be * made available to it (which is server-specific in standard Java EE). * @see org.springframework.transaction.jta.JtaTransactionManager#setTransactionManager */ NOT_SUPPORTED(TransactionDefinition.PROPAGATION_NOT_SUPPORTED), /** * Execute non-transactionally, throw an exception if a transaction exists. * Analogous to EJB transaction attribute of the same name. */ NEVER(TransactionDefinition.PROPAGATION_NEVER), /** * Execute within a nested transaction if a current transaction exists, * behave like PROPAGATION_REQUIRED else. There is no analogous feature in EJB. * <p>Note: Actual creation of a nested transaction will only work on specific * transaction managers. Out of the box, this only applies to the JDBC * DataSourceTransactionManager when working on a JDBC 3.0 driver. * Some JTA providers might support nested transactions as well. * @see org.springframework.jdbc.datasource.DataSourceTransactionManager */ NESTED(TransactionDefinition.PROPAGATION_NESTED);

異常被catch

@Servicepublic class UserServiceImpl implements UserService { @Transactional public void update(User user) { try{ }catch(Exception e){ log.error(e.getMessage(),e); } }}

觸發(fā)回滾的操作是被接收到異常,一般我們會在@Transactional后面加上rollbackFor或者noRollbackForClassName來指明觸發(fā)回滾的異常,但是如果在代碼中給catch了異常,那么對于Spring代理來說就這個方法從頭到尾都沒有問題,自然不會觸發(fā)回滾.

異常類型錯誤

@Servicepublic class UserServiceImpl implements UserService { @Transactional public void update(User user) { try{ }catch(Exception e){ log.error(e.getMessage(),e); throw new Exception(e.getMessage()); } }}

以上方式throw new Exception(e.getMessage());事務(wù)也是無效的,主要原因是事務(wù)回滾的條件是throw 運行時異常(RunTimeException).如果需要其他異常也回滾,需要在@Transactional后面加上rollbackFor或者noRollbackForClassName來指明觸發(fā)回滾的異常.

沒有被Spring管理

不在Spring環(huán)境下,自然不受Spring的管理,事務(wù)管理器也當(dāng)然失去了作用.

沒有配置TransactionManager

需要對當(dāng)前數(shù)據(jù)源配置事務(wù)管理器,尤其是在多數(shù)據(jù)源的情況下.

以上就是Spring事務(wù)失效的幾種原因的詳細(xì)內(nèi)容，更多關(guān)于Spring事務(wù)失效的資料請關(guān)注好吧啦網(wǎng)其它相關(guān)文章！