[sqlite] db File Remains Open After Connection is Closed
Hi Ray, Sqlite.Net implements a connection pooling scheme. Even when your connection is closed, the unmanaged database handle may still be open. After you have disposed of your connection object and are ready to do file-level operations, do something like this: SQLiteConnection.ConnectionPool.ClearPool() This should force the unmanaged connection to close if indeed there are no lingering open managed connections. -- Matt Brown On Thu, Mar 5, 2015 at 12:34 PM, RNACS - Info mailto:info at rnacs.com>> wrote: "SQLconn" is a SQLiteConnection to my database file. Once the connection is closed & disposed of, what still has the .db file still open? How do I close the file so I can delete it?
[sqlite] db File Remains Open After Connection is Closed
Please also note that setting an object to 'nothing' does _not_ dispose it! This was the case back in the VB6 days, but in the .NET world you need to enclose all objects implementing 'IDisposable' in a 'using' block or call Dispose() explicitly on all your objects to properly release any resources. If you don't do so, Dispose() will be called on behalf of the Garbage Collector, which may well never happen during the runtime of your code. GB RNACS - Info schrieb am 05.03.2015 um 21:34: > I have a program written in Visual Basic .NET. > > One of the functions of the program is to move all of the program's data, > including a SQLite database to a different folder. > > The program is a 32-bit application using System.Data.SQLite.dll. > > I am having a problem that after I copy the data to the new folder, the > program fails when I try to delete the old folder. The error message says > that the folder cannot be deleted because the SQLite database file is in use > by another process. > > The code I am using is: > > ' Close license database connection > If Not IsNothing(SQLconn) Then > If SQLconn.State <> ConnectionState.Closed Then > SQLconn.Close() > End If > SQLconn = Nothing > End If > > ' Move data files >'\ code to move files goes here > > ' Delete old directory >Directory.Delete(strOldLocation, > FileIO.DeleteDirectoryOption.DeleteAllContents) > > The error occurs when I try to execute the "Directory.Delete" statement. > > "SQLconn" is a SQLiteConnection to my database file. Once the connection is > closed & disposed of, what still has the .db file still open? How do I > close the file so I can delete it? > > Thank you for any assistance. > > Ray Andrews > > > > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users >
[sqlite] db File Remains Open After Connection is Closed
Hi Ray, At the point when you attempt to delete the folder, if you brake your program there, are you able to delete it via standard windows explorer? If not, how about closing your program, and trying directly after you exit your program? Sometimes an anti-virus or other tool (such as Indexing service or such) might keep hold of the file or folder so you cannot delete it until it is done. Also, do you have permission to delete it? Is the folder near a Windows UAC protected path? (Such as Program Files, Windows, etc). If you break your program and then are able to delete the file via explorer, none of the above is a problem, it must be your program holding it. When you close sqlite (calling close() in the api) it releases the file as soon as it is done with any current outstanding operations (such as a rollback or vacuum etc.) - but returns an error code if anything did not go smoothly. If no error code is returned (i.e SQLITE_OK is returned) then the files was definitely released by SQLite and something else is holding on to them. On 2015-03-05 11:23 PM, RNACS - Info wrote: > Simon, > > Does not help. I put a breakpoint at the "SQLconn = Nothing" statement & > checked the value of SQLconn.State. It was "Closed", so I continued one & > still got the error. > > Ray > > -Original Message- > From: sqlite-users-bounces at mailinglists.sqlite.org > [mailto:sqlite-users-bounces at mailinglists.sqlite.org] On Behalf Of Simon > Slavin > Sent: Thursday, March 05, 2015 3:58 PM > To: General Discussion of SQLite Database > Subject: Re: [sqlite] db File Remains Open After Connection is Closed > > >> On 5 Mar 2015, at 8:34pm, RNACS - Info wrote: >> >> The code I am using is: >> >> ' Close license database connection >> If Not IsNothing(SQLconn) Then >> If SQLconn.State <> ConnectionState.Closed Then >> SQLconn.Close() >> End If >> SQLconn = Nothing >> End If > After "SQLconn.Close()", check again the state of the connection to see if > it was successfully closed. If not, display an error message. > > Simon. > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] db File Remains Open After Connection is Closed
On 5 Mar 2015, at 9:23pm, RNACS - Info wrote: > Does not help. I put a breakpoint at the "SQLconn = Nothing" statement & > checked the value of SQLconn.State. It was "Closed", so I continued one & > still got the error. Okay. Worth checking. I'm afraid I don't know your API well enough to suggest anything else. Simon.
[sqlite] db File Remains Open After Connection is Closed
> On 5 Mar 2015, at 8:34pm, RNACS - Info wrote: > > The code I am using is: > >' Close license database connection >If Not IsNothing(SQLconn) Then >If SQLconn.State <> ConnectionState.Closed Then >SQLconn.Close() >End If >SQLconn = Nothing >End If After "SQLconn.Close()", check again the state of the connection to see if it was successfully closed. If not, display an error message. Simon.
[sqlite] db File Remains Open After Connection is Closed
Simon, Does not help. I put a breakpoint at the "SQLconn = Nothing" statement & checked the value of SQLconn.State. It was "Closed", so I continued one & still got the error. Ray -Original Message- From: sqlite-users-boun...@mailinglists.sqlite.org [mailto:sqlite-users-bounces at mailinglists.sqlite.org] On Behalf Of Simon Slavin Sent: Thursday, March 05, 2015 3:58 PM To: General Discussion of SQLite Database Subject: Re: [sqlite] db File Remains Open After Connection is Closed > On 5 Mar 2015, at 8:34pm, RNACS - Info wrote: > > The code I am using is: > >' Close license database connection >If Not IsNothing(SQLconn) Then >If SQLconn.State <> ConnectionState.Closed Then >SQLconn.Close() >End If >SQLconn = Nothing >End If After "SQLconn.Close()", check again the state of the connection to see if it was successfully closed. If not, display an error message. Simon. ___ sqlite-users mailing list sqlite-users at mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] db File Remains Open After Connection is Closed
No. Any commands will have finished before the user can get to the screen that allows them to move the data files. Ray Andrews -Original Message- From: sqlite-users-boun...@mailinglists.sqlite.org [mailto:sqlite-users-bounces at mailinglists.sqlite.org] On Behalf Of J Decker Sent: Thursday, March 05, 2015 3:45 PM To: General Discussion of SQLite Database Subject: Re: [sqlite] db File Remains Open After Connection is Closed do you have any ... SqliteCommand's laying around that aren't finished? On Thu, Mar 5, 2015 at 12:34 PM, RNACS - Info wrote: > I have a program written in Visual Basic .NET. > > One of the functions of the program is to move all of the program's > data, including a SQLite database to a different folder. > > The program is a 32-bit application using System.Data.SQLite.dll. > > I am having a problem that after I copy the data to the new folder, > the program fails when I try to delete the old folder. The error > message says that the folder cannot be deleted because the SQLite > database file is in use by another process. > > The code I am using is: > > ' Close license database connection > If Not IsNothing(SQLconn) Then > If SQLconn.State <> ConnectionState.Closed Then > SQLconn.Close() > End If > SQLconn = Nothing > End If > > ' Move data files > '\ code to move files goes here > > ' Delete old directory > Directory.Delete(strOldLocation, > FileIO.DeleteDirectoryOption.DeleteAllContents) > > The error occurs when I try to execute the "Directory.Delete" statement. > > "SQLconn" is a SQLiteConnection to my database file. Once the > connection is closed & disposed of, what still has the .db file still > open? How do I close the file so I can delete it? > > Thank you for any assistance. > > Ray Andrews > > > > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > ___ sqlite-users mailing list sqlite-users at mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] db File Remains Open After Connection is Closed
I have a program written in Visual Basic .NET. One of the functions of the program is to move all of the program's data, including a SQLite database to a different folder. The program is a 32-bit application using System.Data.SQLite.dll. I am having a problem that after I copy the data to the new folder, the program fails when I try to delete the old folder. The error message says that the folder cannot be deleted because the SQLite database file is in use by another process. The code I am using is: ' Close license database connection If Not IsNothing(SQLconn) Then If SQLconn.State <> ConnectionState.Closed Then SQLconn.Close() End If SQLconn = Nothing End If ' Move data files '\ code to move files goes here ' Delete old directory Directory.Delete(strOldLocation, FileIO.DeleteDirectoryOption.DeleteAllContents) The error occurs when I try to execute the "Directory.Delete" statement. "SQLconn" is a SQLiteConnection to my database file. Once the connection is closed & disposed of, what still has the .db file still open? How do I close the file so I can delete it? Thank you for any assistance. Ray Andrews
[sqlite] db File Remains Open After Connection is Closed
do you have any ... SqliteCommand's laying around that aren't finished? On Thu, Mar 5, 2015 at 12:34 PM, RNACS - Info wrote: > I have a program written in Visual Basic .NET. > > One of the functions of the program is to move all of the program's data, > including a SQLite database to a different folder. > > The program is a 32-bit application using System.Data.SQLite.dll. > > I am having a problem that after I copy the data to the new folder, the > program fails when I try to delete the old folder. The error message says > that the folder cannot be deleted because the SQLite database file is in > use > by another process. > > The code I am using is: > > ' Close license database connection > If Not IsNothing(SQLconn) Then > If SQLconn.State <> ConnectionState.Closed Then > SQLconn.Close() > End If > SQLconn = Nothing > End If > > ' Move data files > '\ code to move files goes here > > ' Delete old directory > Directory.Delete(strOldLocation, > FileIO.DeleteDirectoryOption.DeleteAllContents) > > The error occurs when I try to execute the "Directory.Delete" statement. > > "SQLconn" is a SQLiteConnection to my database file. Once the connection > is > closed & disposed of, what still has the .db file still open? How do I > close the file so I can delete it? > > Thank you for any assistance. > > Ray Andrews > > > > ___ > sqlite-users mailing list > sqlite-users at mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users >
