BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  FetchBlob issue          BorlandTalk.com Forum Index -> Delphi Databases (Multi-Tier) View previous topic :: View next topic   Author Message Brandon Lilly Guest Posted: Fri Jul 11, 2003 11:55 pm    Post subject: FetchBlob issue We have tried to implement the FetchBlobs method of the TClientDataSet and have been running into an issue where Delphi displays an error dialog indicating that the record has been changed by another user, and we're pretty boggled as to why that would happen. On the server-side we have a standard ADODataSet attached to a provider. The ProviderFlags = [poFetchBlobsOnDemand,poIncFieldProps,poPropogateChanges]. On the client-side we are simply creating a dataset, fetching parameters, assigning the paramters, and opening the dataset. This works fine as the non-blob columns contain data. We get access violations accessing any of the blob columns at this point, which is fine, as we haven't fetched them. When we call FetchBlobs we get the afforementioned error message from the server app. We profiled the sql and we saw where delphi was querying table with the earlier supplied key value, after which the error is displayed. After opening the clientdataset, we are not modifying any data and we are the only ones in the database, so we know the record is not being changed by anybody. Are there known bugs or configuration "gotchas" regarding FetchBlobs? I searched Google and could not find any answers (just people like me asking questions). Thanks, Brandon -- "In the beginning the universe was created. This has made a lot of people very angry, and has been widely regarded as a bad move." - Douglas Noel Adams (1952-2001) Back to top Dave Rowntree Guest Posted: Mon Jul 14, 2003 9:25 am    Post subject: Re: FetchBlob issue You don't say what version of Delphi you are using? -- Dave Rowntree Back to top Brandon Lilly Guest Posted: Mon Jul 14, 2003 5:38 pm    Post subject: Re: FetchBlob issue "Dave Rowntree" <daver (AT) spam_offbrookswood (DOT) co.uk> wrote Quote: You don't say what version of Delphi you are using? Sorry, Delphi 6.02 Windows XP SP1 Brandon -- "In the beginning the universe was created. This has made a lot of people very angry, and has been widely regarded as a bad move." - Douglas Noel Adams (1952-2001) Back to top Dave Rowntree Guest Posted: Mon Jul 14, 2003 9:41 pm    Post subject: Re: FetchBlob issue "Brandon Lilly" <brandon.lilly (AT) nospam_medevolve (DOT) com> wrote: Quote: Sorry, Delphi 6.02 Windows XP SP1 CDS.FetchBlobs is a stateful call. It does not pass the CDS.Params to the DSP. If you are running a stateless appserver this is likely to be your problem. You can make the call behave statelessly by using the BeforeRowRequest events on the CDS and DSP to pass the CDS.Params to the DSP, and set them on the DSP.DataSet. Use the PackageParams and UnpackParams utility functions to convert CDS.Params to an OleVariant and back again. -- Dave Rowntree Back to top Brandon Lilly Guest Posted: Mon Jul 14, 2003 10:34 pm    Post subject: Re: FetchBlob issue "Dave Rowntree" <daver (AT) spam_offbrookswood (DOT) co.uk> wrote Quote: CDS.FetchBlobs is a stateful call. It does not pass the CDS.Params to the DSP. If you are running a stateless appserver this is likely to be your problem. Our server is not stateless (yet - we plan to do this in the coming year). When calling FetchBlobs, the query that I see in Profiler has the correct parameters being passed to it, so I don't think this is the issue, but I will try your suggestion regardless later this week. If you can think of anything else in the meantime, that would be great. Thanks, Brandon -- "In the beginning the universe was created. This has made a lot of people very angry, and has been widely regarded as a bad move." - Douglas Noel Adams (1952-2001) 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 (Multi-Tier) 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.