const主题的文章列表，还有const的技术要点_第1页

c++的const修饰符用法

1.将一个对象设置为不可修改constinta=100;2.指向const对象的指针constint*p=3;可以通过指针来修改指针所指向的值，但是不能通过指针*p修改对像的值3.intconst*p=0;可以指针的指向不能改变，但可以修改指向的值，4.指向const对象的const指针。两者都不能修改...

开发笔记 ·2024-09-09

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...

开发笔记 ·2023-10-20

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...

开发笔记 ·2023-10-10

ORA-25127: RELY not allowed in NOT NULL constraint

文档解释ORA-25127:RELYnotallowedinNOTNULLconstraintCause:AnattempttosetRELYonforNOTNULLconstraint.Action:onlyNORELYmaybespecifiedforaNOTNULLconstraint.ORA-25127是一个O...

IT技术学习 ·2023-07-28

ORA-28117: integrity constraint violated – parent record not found

文档解释ORA-28117:integrityconstraintviolated–parentrecordnotfoundCause:trytoupdate/insertachildrecordwithnewforeignkeyvalues,butthecorrespondingparentrowisno...

IT技术学习 ·2023-07-28

ORA-30731: scope constraint not allowed on nested table column when the nested table is being created

文档解释ORA-30731:scopeconstraintnotallowedonnestedtablecolumnwhenthenestedtableisbeingcreatedCause:Anattemptwasmadetodefineascopeconstraintonanestedtablecolumnwhen...

IT技术学习 ·2023-07-28

ORA-55493: specified VPD policy constraint does not exist

文档解释ORA-55493:specifiedVPDpolicyconstraintdoesnotexistCause:AnattemptwasmadetooperateonanOracleVirtualPrivateDatabase(VPD)constraintthatdidnotexist.Action:None官...

IT技术学习 ·2023-07-28

ORA-22896: cannot have both scope and referential constraint on REF column “string”

文档解释ORA-22896:cannothavebothscopeandreferentialconstraintonREFcolumn“string”Cause:REFcolumnhasbothareferentialandascopeconstraint.Areferentialconstr...

IT技术学习 ·2023-07-28

ORA-30733: cannot specify rowid constraint on scoped ref column

文档解释ORA-30733:cannotspecifyrowidconstraintonscopedrefcolumnCause:AnattemptwasmadetospecifyrowidconstraintonascopedREFcolumn.Action:Removetherowidconstraintandth...

IT技术学习 ·2023-07-27

ORA-14130: UNIQUE constraints mismatch in ALTER TABLE EXCHANGE PARTITION

文档解释ORA-14130:UNIQUEconstraintsmismatchinALTERTABLEEXCHANGEPARTITIONCause:OneofthetablesnamedintheALTERTABLEEXCHANGEPARTITIONcommandhasaUNIQUEconstraintforwhich...

IT技术学习 ·2023-07-27

ORA-14455: attempt to create referential integrity constraint on temporary table

文档解释ORA-14455:attempttocreatereferentialintegrityconstraintontemporarytableCause:Anattemptwasmadetocreateareferentialintegrityconstraintonatemporarytable.Thisis...

IT技术学习 ·2023-07-26

ORA-39906: Constraint string between table string.string in tablespace string and table string.string in tablespace string.

文档解释ORA-39906:Constraintstringbetweentablestring.stringintablespacestringandtablestring.stringintablespacestring.Cause:Informationalmessagetodescribeafailuredur...

IT技术学习 ·2023-07-26

ORA-13050: unable to construct spatial object

文档解释ORA-13050:unabletoconstructspatialobjectCause:Thisisaninternalerror.Action:ContactOracleSupportServices.ORA-13050是由Oracle数据库抛出的一个错误，其中表明无法构造出一个空间对象，即无法构造出一个...

IT技术学习 ·2023-07-26

ORA-07416: slpath: pathname construction failed; lack of output buffer space.

文档解释ORA-07416:slpath:pathnameconstructionfailed;lackofoutputbufferspace.Cause:Theslpathroutineisgivenamaximumlengthbuffertoexpandthenameinto.Anoverflowofthisbuf...

IT技术学习 ·2023-07-26

ORA-22899: cannot specify both scope and rowid constraint on ref column

文档解释ORA-22899:cannotspecifybothscopeandrowidconstraintonrefcolumnCause:AnattemptwasmadetospecifybothascopeandarowidconstraintonaREFcolumn.Action:Removeeitherthe...

IT技术学习 ·2023-07-26