BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Delphi 2007 DBX4 TDBXError when empty resultset is read          BorlandTalk.com Forum Index -> Delphi Databases (dbExpress) View previous topic :: View next topic   Author Message Michael Justin Guest Posted: Wed May 02, 2007 8:54 pm    Post subject: Delphi 2007 DBX4 TDBXError when empty resultset is read If the TSQLQuery result set is empty (Eof is True), accessing fields by name fails with an TDBXError exception, as a workaround i have to check for Eof before using any FieldByName('...').As... call. In Delphi 7, in this situation reading the empty resultset returns default (empty) values. Should i add a QC entry for this with all details? Michael Justin Back to top Bill Todd Guest Posted: Thu May 03, 2007 5:38 am    Post subject: Re: Delphi 2007 DBX4 TDBXError when empty resultset is read Michael Justin wrote: Quote: Should i add a QC entry for this with all details? Yes. -- Bill Todd (TeamB) Back to top Steve Shaughnessy Guest Posted: Sat May 05, 2007 4:56 am    Post subject: Re: Delphi 2007 DBX4 TDBXError when empty resultset is read This caused an AV in BDS2006. We changed it to a TDBXError because we think it is invalid to attemp accessing a value that does not exist. Checking for Eof also provides more clarity in your code. -Steve "Michael Justin" <info (AT) betabeans (DOT) de> wrote in message news:4638b44a (AT) newsgroups (DOT) borland.com... Quote: If the TSQLQuery result set is empty (Eof is True), accessing fields by name fails with an TDBXError exception, as a workaround i have to check for Eof before using any FieldByName('...').As... call. In Delphi 7, in this situation reading the empty resultset returns default (empty) values. Should i add a QC entry for this with all details? Michael Justin Back to top Dmitry Arefiev Guest Posted: Sat May 05, 2007 8:11 am    Post subject: Re: Delphi 2007 DBX4 TDBXError when empty resultset is read Quote: We changed it to a TDBXError because we think it is invalid to attemp accessing a value that does not exist. Yes, it is. But that may break a lot of code. Because long time in Delphi and in many data access libraries field values in empty dataset were Null's. Regards, Dmitry -- Dmitry Arefiev - www.da-soft.com AnyDAC - Oracle, MySQL, MSSQL, MSAccess, IBM DB2, Sybase ASA, DbExpress, ODBC freeware data access framework Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> Delphi Databases (dbExpress) All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.