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C++ string函数的用法

std::string相当于stringstring::npos取值由实现决定,一般是-1find_first_of()和find_last_of()函数find_first_of()和find_last_of()执行简单的模式匹配,如在字符串中查找单个字符c。函数find_first_of()查找在字符串中第1个出现...
开发笔记 ·2024-10-29

Python中str.replace()的使用方法

Example:  target=today+os.sep+now+'_'+comment.replace('','_')+'.zip'  #today被定义为根目录+今日时间,同理,now定义为为此时时间,例如为09.01.16:34...
开发笔记 ·2024-10-21

FastAdmin 提示框 toastr 改变文字

只要后台使用$this->success("自定义成功提示内容");即可修改提示的文字 ...

Redis中String类型有哪些常见命令?

Redis全称是RemoteDictionaryServer,远程词典服务器,是一个基于内存的键值型NoSQL数据库。String类型,是字符串类型,是Redis中最简单的存储类型。其value是字符串,不过根据字符串的格式不同,又可以分为3类: •tring:普通字符串 •&n...

Struts2中EL表达式如何执行

在Struts2中,EL表达式是通过OGNL(Object-GraphNavigationLanguage)来执行的。EL表达式可以在Struts2的jsP页面或配置文件中使用。在JSP页面中,可以使用EL表达式来获取Action类中的属性值。例如,通过`${actionName.propertyName}`来获取Ac...

注解 javax.validation.constraints下的注解

@NotBlank,@NotNoll,@NotEmpty实体字段校验之间的区别简单的来说字符串用@NotBlank基本类型用@NotNoll集合类型@NotEmpty...

ORA-00001: unique constraint violated异常处理

程序中保存数据时报错,ORA-00001:uniqueconstraint(xxxx)violated先是查看数据库结构,最近也没什么改动,开发环境也正常,测试环境就报这个错后来发现主键id是自增的,查询序列的下个值  selecttable_seq.nextval fromdual发现这...

ORA-55366: unknown namespace prefix “string”

文档解释ORA-55366:unknownnamespaceprefix“string”Cause:AnattemptwasmadetomakeuseofanundefinednamespaceprefixinOracleVirtualPrivateDatabase(VPD)metadata.A...

ORA-47346: Rule set string is used by one or more command rules.

文档解释ORA-47346:Rulesetstringisusedbyoneormorecommandrules.Cause:Thespecifiedrulesetwasusedbyexistingcommandrule(s).Action:Removethedependentcommandrulesandretryt...
IT技术学习 ·2023-07-28

ORA-39164: Partition string was not found.

文档解释ORA-39164:Partitionstringwasnotfound.Cause:Ifexportingorimportingoverthenetwork,theuserspecifiedapartitionnamethatwasnotfoundinthesourcedatabase.Forimportin...

ORA-39183: internal error string ocurred during decompression phase string

文档解释ORA-39183:internalerrorstringocurredduringdecompressionphasestringCause:Anunexpectederroroccurredwhiledecompressingdatabuffers.Action:ContactOracleCustomerS...

ORA-44747: An XMLIndex with a structured component cannot be specified with ASYNC.

文档解释ORA-44747:AnXMLIndexwithastructuredcomponentcannotbespecifiedwithASYNC.Cause:AnattemptwasmadetospecifyASYNCparameterforanXMLIndexwithastructuredcomponent.Ac...

ORA-38810: Implementation restriction: cannot drop edition that has a parent and a child

文档解释ORA-38810:Implementationrestriction:cannotdropeditionthathasaparentandachildCause:Thiserroroccurredbecauseanattemptwasmadetodropaneditionthathasaparentandac...

ORA-31037: Invalid XML attribute name string

文档解释ORA-31037:InvalidXMLattributenamestringCause:TheattributenameintheXMLdocumentdidnotmatchanythingintheassociatedschema.Action:Supplyonlyschema-definedorXMLst...

ORA-39034: Table string does not exist.

文档解释ORA-39034:Tablestringdoesnotexist.Cause:TheuserreferencedatableinanAPIthatdidnotexist.Action:CorrecttablenameandretryAPI.ORA-39034:Tablestringdoesnotexist.这...
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