BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Transaction problem ?          BorlandTalk.com Forum Index -> Delphi Databases (InterBase Express) View previous topic :: View next topic   Author Message Jochem Smeets Guest Posted: Wed Apr 11, 2007 6:12 pm    Post subject: Transaction problem ? Setup is as follows : Delphi 2006 & Interbase 7.5 develloper edition. I have a TIBQuery (Query-A) wich is connected to a TIBTransaction(Transaction-A) , TIBUpdateSQL (UpdateSQL-A) and a DataSource. I use this DataSource to connect to the grid in the main form. Now this part works as I want it to work. Inserts, Updates , Deletes they all are commited through the AfterPost Event of the TIBQuery (by calling the 'CommitRetaining' of the TIBTransaction connected to the TIBQuery) And the Grid nicely reflects any changes I make. Now I have another TIBQuery & TIBTransaction. Lets call them Query-B & Transaction-B. I use Query-B (and Transaction-B) to execute an update statement on the table which Query-A connects to as wel. Now if I commit the changes I made using Query-B, I don't see them in my grid , even after a refresh or close/open. So Query-A refuses to read the new data that has been commited by Query-B If I use an external tool I can clearly see the changes so I know the commit by Query-B was succesfull only Query-A does not seem to notice it. Any help is appreciated Regards Jochem Back to top Wayne Niddery [TeamB] Guest Posted: Wed Apr 11, 2007 6:32 pm    Post subject: Re: Transaction problem ? Jochem Smeets wrote: Quote: Now I have another TIBQuery & TIBTransaction. Lets call them Query-B & Transaction-B. I use Query-B (and Transaction-B) to execute an update statement on the table which Query-A connects to as wel. Now if I commit the changes I made using Query-B, I don't see them in my grid , even after a refresh or close/open. So Query-A refuses to read the new data that has been commited by Query-B If I use an external tool I can clearly see the changes so I know the commit by Query-B was succesfull only Query-A does not seem to notice it. There are two points here, the first is that you cannot "refresh" a query - refresh only acts on the single current record, not the entire result set. To refresh the entire query it must be closed and reopened. However that is not enough, the second thing is the transaction's isolation. By default this is "snapshot" which means it will only see data as it was at the time the transaction was first opened. Change transaction-A's isoaltion to ReadCommitted. -- Wayne Niddery - Winwright, Inc (www.winwright.ca) "Bandwagons are like streetcars, there'll be another along in a few minutes." Back to top Jochem Smeets Guest Posted: Wed Apr 11, 2007 7:09 pm    Post subject: Re: Transaction problem ? Thank you. Changing the Isolation level of the Transaction-A did work. Now if I 'refresh' the updated values are shown. I did not have to reopen the Query-A or Transaction-A but I use a Dev Express grid, if i press the refresh button of that grid it apparently makes sure the Query-A is being re-executed. And so showing me every updated record. Jochem "Wayne Niddery [TeamB]" <wniddery (AT) chaffaci (DOT) on.ca> schreef in bericht news:461ce37d$1 (AT) newsgroups (DOT) borland.com... Quote: Jochem Smeets wrote: Now I have another TIBQuery & TIBTransaction. Lets call them Query-B & Transaction-B. I use Query-B (and Transaction-B) to execute an update statement on the table which Query-A connects to as wel. Now if I commit the changes I made using Query-B, I don't see them in my grid , even after a refresh or close/open. So Query-A refuses to read the new data that has been commited by Query-B If I use an external tool I can clearly see the changes so I know the commit by Query-B was succesfull only Query-A does not seem to notice it. There are two points here, the first is that you cannot "refresh" a query - refresh only acts on the single current record, not the entire result set. To refresh the entire query it must be closed and reopened. However that is not enough, the second thing is the transaction's isolation. By default this is "snapshot" which means it will only see data as it was at the time the transaction was first opened. Change transaction-A's isoaltion to ReadCommitted. -- Wayne Niddery - Winwright, Inc (www.winwright.ca) "Bandwagons are like streetcars, there'll be another along in a few minutes." Back to top Wayne Niddery [TeamB] Guest Posted: Thu Apr 12, 2007 12:02 am    Post subject: Re: Transaction problem ? Jochem Smeets wrote: Quote: Thank you. Changing the Isolation level of the Transaction-A did work. Now if I 'refresh' the updated values are shown. I did not have to reopen the Query-A or Transaction-A but I use a Dev Express grid, if i press the refresh button of that grid it apparently makes sure the Query-A is being re-executed. And so showing me every updated record. Good. I assumed you meant the Refresh method of the dataset. -- Wayne Niddery - Winwright, Inc (www.winwright.ca) "Reality is that which, when you stop believing in it, doesn't go away." — Philip K. Dick 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 (InterBase Express) 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.