Re: [sqlite] [newbie/VB.Net + SQLite] Reliable file hashing?
Am 05.03.2010 15:34, schrieb Gilles Ganault: > In the following code, a record is added everytime, although this file > is already in the SQLite database (I checked by opening it with a > stand-alone application after running the program once): > > http://pastebin.ca/1823757 > > The problem occurs around line 63. > > I'm using TEXT to hold the hash column: Could it be that, for some > reason, this data isn't reliably saved or read, which would explain > why a new record is INSERTed every time, even though this item is > already in the database? > > Thank you for any hint. > Hi Gilles, I think the problem is the query, whether there is already an entry in the database: SQLcommand.CommandText = "SELECT id,name,hash FROM files WHERE hash='@hash'" The parameter probably shouldn't be put in quotes as you did. This way the query looks for the literal '@hash' which doesn't get replaced by the SQLite-ADO.NET provider and which of course doesn't exist in the db. Hope that helps, Bernd ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] [newbie/VB.Net + SQLite] Reliable file hashing?
Hello, I can't check the VB at this moment, but I think that you dont need de single quotes around the @hash parameter in line 65. Hope this helps Xevi Al 05/03/2010 15:48, En/na Nick Shaw ha escrit: > Small aside: Why do you select the id, name AND hash in the select? You > don't appear to use them. > > I can't see anything specifically wrong, but try doing "SELECT COUNT(id) > WHERE hash='@hash'" instead, and see if the returned count > 0 or not. > > You could also maybe test your routine by passing in a fixed string as > the hash='@hash' value each time and check it does actually returns > rows. > > My guess is there's something subtle wrong with the VB.NET code, but my > VB.NET syntax knowledge is not up to the job of finding any problem I > can see. :) > > Thanks, > Nick. > > -Original Message- > From: sqlite-users-boun...@sqlite.org > [mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Gilles Ganault > Sent: 05 March 2010 14:35 > To: sqlite-users@sqlite.org > Subject: [sqlite] [newbie/VB.Net + SQLite] Reliable file hashing? > > Hello, > > I'm having the following issue while looping through a > directory: > for each file, I need to hash its content, check if this file is > already in an DB, add a record if it isn't. > The goal of this application is to check a whole drive for UltraEdit > temp files, check for duplicates, and save any unique file into a > backup directory. > > In the following code, a record is added everytime, although this file > is already in the SQLite database (I checked by opening it with a > stand-alone application after running the program once): > > http://pastebin.ca/1823757 > > The problem occurs around line 63. > > I'm using TEXT to hold the hash column: Could it be that, for some > reason, this data isn't reliably saved or read, which would explain > why a new record is INSERTed every time, even though this item is > already in the database? > > Thank you for any hint. > > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > ___ > sqlite-users mailing list > sqlite-users@sqlite.org > http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users > > ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
Re: [sqlite] [newbie/VB.Net + SQLite] Reliable file hashing?
Small aside: Why do you select the id, name AND hash in the select? You don't appear to use them. I can't see anything specifically wrong, but try doing "SELECT COUNT(id) WHERE hash='@hash'" instead, and see if the returned count > 0 or not. You could also maybe test your routine by passing in a fixed string as the hash='@hash' value each time and check it does actually returns rows. My guess is there's something subtle wrong with the VB.NET code, but my VB.NET syntax knowledge is not up to the job of finding any problem I can see. :) Thanks, Nick. -Original Message- From: sqlite-users-boun...@sqlite.org [mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Gilles Ganault Sent: 05 March 2010 14:35 To: sqlite-users@sqlite.org Subject: [sqlite] [newbie/VB.Net + SQLite] Reliable file hashing? Hello, I'm having the following issue while looping through a directory: for each file, I need to hash its content, check if this file is already in an DB, add a record if it isn't. The goal of this application is to check a whole drive for UltraEdit temp files, check for duplicates, and save any unique file into a backup directory. In the following code, a record is added everytime, although this file is already in the SQLite database (I checked by opening it with a stand-alone application after running the program once): http://pastebin.ca/1823757 The problem occurs around line 63. I'm using TEXT to hold the hash column: Could it be that, for some reason, this data isn't reliably saved or read, which would explain why a new record is INSERTed every time, even though this item is already in the database? Thank you for any hint. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
[sqlite] [newbie/VB.Net + SQLite] Reliable file hashing?
Hello, I'm having the following issue while looping through a directory: for each file, I need to hash its content, check if this file is already in an DB, add a record if it isn't. The goal of this application is to check a whole drive for UltraEdit temp files, check for duplicates, and save any unique file into a backup directory. In the following code, a record is added everytime, although this file is already in the SQLite database (I checked by opening it with a stand-alone application after running the program once): http://pastebin.ca/1823757 The problem occurs around line 63. I'm using TEXT to hold the hash column: Could it be that, for some reason, this data isn't reliably saved or read, which would explain why a new record is INSERTed every time, even though this item is already in the database? Thank you for any hint. ___ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
