BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  TADOQuery exception          BorlandTalk.com Forum Index -> Delphi Databases (ADO) View previous topic :: View next topic   Author Message Alan Guest Posted: Thu Jun 01, 2006 7:15 am    Post subject: TADOQuery exception I got an access violation exception at the following line: try .... ADOQuery1.SQL.Text := 'SELECT FileName, Directory ' + sFrom + ' ' + sWhere; ADOQuery1.open; except end; Although there is exception, it can still open and give me the result, I don't know why ? Back to top Guillem Guest Posted: Thu Jun 01, 2006 2:13 pm    Post subject: Re: TADOQuery exception Alan wrote: Quote: I got an access violation exception at the following line: try .... ADOQuery1.SQL.Text := 'SELECT FileName, Directory ' + sFrom + ' ' + sWhere; ADOQuery1.open; except end; Although there is exception, it can still open and give me the result, I don't know why ? I understand you get the AV when assigning the Text property, right? what are sFrom and sWhere? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Alan Guest Posted: Fri Jun 02, 2006 4:16 am    Post subject: Re: TADOQuery exception The sFrom and sWhere are string. It got AV at that statement but the ADOQuery opened with return record set. I just wonder why if did not go to the except part. "Guillem" <guillemvicens-nospam (AT) clubgreenoasis (DOT) com> wrote in message news:xn0emyh8h47a5k000 (AT) newsgroups (DOT) borland.com... Quote: Alan wrote: I got an access violation exception at the following line: try .... ADOQuery1.SQL.Text := 'SELECT FileName, Directory ' + sFrom + ' ' + sWhere; ADOQuery1.open; except end; Although there is exception, it can still open and give me the result, I don't know why ? I understand you get the AV when assigning the Text property, right? what are sFrom and sWhere? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Viatcheslav V. Vassiliev Guest Posted: Fri Jun 02, 2006 8:15 am    Post subject: Re: TADOQuery exception Turn off all event handlers attached to TADOConnection and TADOQuery - AV may happen in one of them. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi for Win32 + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Alan" <alanpltseNOSPAM (AT) yahoo (DOT) com.au> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:447f7af3 (AT) newsgroups (DOT) borland.com... Quote: The sFrom and sWhere are string. It got AV at that statement but the ADOQuery opened with return record set. I just wonder why if did not go to the except part. "Guillem" <guillemvicens-nospam (AT) clubgreenoasis (DOT) com> wrote in message news:xn0emyh8h47a5k000 (AT) newsgroups (DOT) borland.com... Alan wrote: I got an access violation exception at the following line: try .... ADOQuery1.SQL.Text := 'SELECT FileName, Directory ' + sFrom + ' ' + sWhere; ADOQuery1.open; except end; Although there is exception, it can still open and give me the result, I don't know why ? I understand you get the AV when assigning the Text property, right? what are sFrom and sWhere? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Alan Guest Posted: Wed Jun 07, 2006 5:03 am    Post subject: Re: TADOQuery exception Hi, I checked that both TADOConnection and TADOQuery components have no event handlers attached. "Viatcheslav V. Vassiliev" <support (AT) oledbdirect (DOT) com> wrote in message news:447fe659$1 (AT) newsgroups (DOT) borland.com... Quote: Turn off all event handlers attached to TADOConnection and TADOQuery - AV may happen in one of them. //------------------------------------------ Regards, Vassiliev V. V. http://www.managed-vcl.com - using .Net objects in Delphi for Win32 + ADO.Net http://www.oledbdirect.com - The fastest way to access MS SQL Server, MS Jet (Access) and Interbase (through OLEDB) "Alan" <alanpltseNOSPAM (AT) yahoo (DOT) com.au> ÓÏÏÂÝÉÌ/ÓÏÏÂÝÉÌÁ × ÎÏ×ÏÓÔÑÈ ÓÌÅÄÕÀÝÅÅ: news:447f7af3 (AT) newsgroups (DOT) borland.com... The sFrom and sWhere are string. It got AV at that statement but the ADOQuery opened with return record set. I just wonder why if did not go to the except part. "Guillem" <guillemvicens-nospam (AT) clubgreenoasis (DOT) com> wrote in message news:xn0emyh8h47a5k000 (AT) newsgroups (DOT) borland.com... Alan wrote: I got an access violation exception at the following line: try .... ADOQuery1.SQL.Text := 'SELECT FileName, Directory ' + sFrom + ' ' + sWhere; ADOQuery1.open; except end; Although there is exception, it can still open and give me the result, I don't know why ? I understand you get the AV when assigning the Text property, right? what are sFrom and sWhere? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Guillem Guest Posted: Thu Jun 08, 2006 6:07 pm    Post subject: Re: TADOQuery exception Alan wrote: Quote: Hi, I checked that both TADOConnection and TADOQuery components have no event handlers attached. are you sure that both are properly created and nothing is freed? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Alan Guest Posted: Tue Jun 13, 2006 8:11 am    Post subject: Re: TADOQuery exception Sorry, I don't understand what do you mean ? It raised exception when I assign a string to the text property of the TADOQuery. "Guillem" <guillemvicens-nospam (AT) clubgreenoasis (DOT) com> wrote in message news:xn0en8he2e3f6k000 (AT) newsgroups (DOT) borland.com... Quote: Alan wrote: Hi, I checked that both TADOConnection and TADOQuery components have no event handlers attached. are you sure that both are properly created and nothing is freed? -- Best regards :) Guillem Vicens Meier Dep. Informatica Green Service S.A. www.clubgreenoasis.com -- Contribute to the Indy Docs project: http://docs.indyproject.org -- In order to contact me remove the -nospam Back to top Guillem Guest Posted: Tue Jun 13, 2006 2:35 pm    Post subject: Re: TADOQuery exception Alan wrote: Quote: Sorry, I don't understand what do you mean ? It raised exception when I assign a string to the text property of the TADOQuery. what I mean is that AV isually occur when something is trying to access a space of memory which it should not. This reminds me, have you also checked that you have the latest version of MDAC installed? Maybe it is a bug in ADO itself. http://msdn.microsoft.com/data/ref/mdac/downloads/ -- Best regards :) Guillem Vicens Meier Dep. 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