ev主题的文章列表，还有ev的技术要点_第1页

e.preventDefault()是什么

e.preventDefault()是一个JavaScript函数，它可以阻止浏览器的默认行为。例如，当你点击一个超链接时，浏览器会自动跳转到超链接指向的页面，这就是浏览器的默认行为。如果你希望在点击超链接时不跳转，可以在超链接的事件处理函数中使用e.preventDefault()来阻止浏览器的默认行为。 ...

开发笔记 ·2024-12-12

事务隔离级别(IsolationLevel)

事务的特性（ACID）1、原子性（Atomicity）　　事物是数据库的逻辑工作单位，事务中的诸多操作要么全做要么全不做2、一致性（Consistency）　　事务执行结果必须是使数据库从一个一致性状态变到另一个一致性状态3、隔离性（Isolation）　　一个数据的执行不能被其他事务干扰4、持续性/永久性（Durab...

开发笔记 ·2024-09-02

怎么让DEV的wizardcontrol控件的页数增加

把控件拖到页面，点击右上角的小三角，然后有个AddPage就能添加了...

开发笔记 ·2024-01-02

torch.device()

torch.device代表将torch.Tensor分配到的设备的对象，有cpu和cuda两种，这里的cuda就是gpu，至于为什么不直接用gpu与cpu对应，是因为gpu的编程接口采用的是cudaprint(torch.cuda.is_available())#cuda是否可用；print(torch.cuda.d...

开发笔记 ·2023-08-15

ORA-60025: Event for temp segment cleanup used for temp lobs

文档解释ORA-60025:EventfortempsegmentcleanupusedfortemplobsCause:TempLOBsegmentsusedfortemporaryLOBsaredeletedonlyonsessionexitwhichmayleadtolargeamountsofmemorybei...

IT技术学习 ·2023-07-28

ORA-47402: incorrect evaluation options value for Factor string

文档解释ORA-47402:incorrectevaluationoptionsvalueforFactorstringCause:ThefactorevaluationsoptionsvalueisincorrectAction:Pleasereviewthefactordefinitionandcorrectita...

IT技术学习 ·2023-07-28

ORA-41604: cannot revoke a privilege that was not granted

文档解释ORA-41604:cannotrevokeaprivilegethatwasnotgrantedCause:Anattemptwasmadetorevokeaprivilegethatwasnevergranted.Action:NoneORA-41604错误代表着不能撤销一个没有被授予的权限。官方解释常见案...

IT技术学习 ·2023-07-28

ORA-46078: Invalid event type specified

文档解释ORA-46078:InvalideventtypespecifiedCause:Theeventtypespecifiedisinvalid.Action:Reattempttheoperationwithaninvalideventtype.ORA-46078是一个应用程序级错误，它表明提供的事件类型无效。...

IT技术学习 ·2023-07-28

ORA-30364: this level has the same set of columns as another

文档解释ORA-30364:thislevelhasthesamesetofcolumnsasanotherCause:Theleveldefinitioncontainedthesamesetofcolumnsasanotherlevel.Action:Eliminatetheredundantleveldefini...

IT技术学习 ·2023-07-28

ORA-41662: number of primitive events in the composite event exceeds maximum limit

文档解释ORA-41662:numberofprimitiveeventsinthecompositeeventexceedsmaximumlimitCause:Anattemptwasmadetocreateacompositeeventstructurewithmorethan32primitiveevents.A...

IT技术学习 ·2023-07-28

ORA-31128: The event handler calls cannot exceed the depth of string

文档解释ORA-31128:TheeventhandlercallscannotexceedthedepthofstringCause:Triedtofireaneventwithdepthexceedingthemaximum.Action:Makesuretheeventthatisbeingfireddoesno...

IT技术学习 ·2023-07-28

ORA-32335: dimension must have at least one level

文档解释ORA-32335:dimensionmusthaveatleastonelevelCause:Anlevel-lessdimensionisnotallowed.Action:Donotdroptheonlylevelofadimension.ORA-32335:dimensionmusthaveatleas...

IT技术学习 ·2023-07-28

ORA-39502: failed to notify CRS of a Startup/Shutdown event [string] (ignored)

文档解释ORA-39502:failedtonotifyCRSofaStartup/Shutdownevent[string](ignored)Cause:Theinstancewasunabletocreateanenvironmentcontext.Action:NoneRequired.Theerrorisign...

IT技术学习 ·2023-07-28

ORA-38820: user has evolved object type

文档解释ORA-38820:userhasevolvedobjecttypeCause:Usercouldnotbeeditionenabledifithasevolvedobjecttype.Action:Resettheevolvedobjecttypefirst.错误说明ORACLE错误代码ORA-38820表示...

IT技术学习 ·2023-07-28

ORA-04077: WHEN clause cannot be used with table level triggers

文档解释ORA-04077:WHENclausecannotbeusedwithtableleveltriggersCause:Thewhenclausecanonlybespecifiedforrowleveltriggers.Action:Removethewhenclauseorspecifyforeachrow...

IT技术学习 ·2023-07-28