Hello John, Thank you for your answer but I suspect this is not the reason for the following cases: 1. I modified the code to check for the sqlite3_close return value and it never fails; the error keeps happening though 2. If I remove completely the sqlite3_close statement, the error still occurs 3. In my actual application, I don't open so many dbs: I open about 7 and I do many transactions in each one (and do not close them until program exit). 4. The problem is related to this post: http://www.mail-archive.com/sqlite-users@sqlite.org/msg15494.html My case is exactly the same (although I cannot step into the c code to see what is happening). 5. Why does the error goes away when I set 'PRAGMA synchronous = off;'?
I am afraid it is somehow related with the file handling routines and WinXP but I don't have the slightest idea what to do: the problem is that this is a really serious issue and, if it is not my fault, a show-stopper for winXP usage of SQLITE3. Costas > -----Original Message----- > From: John Stanton [mailto:[EMAIL PROTECTED] > Sent: Κυριακή, 4 Ιουνίου 2006 4:05 πμ > To: sqlite-users@sqlite.org > Subject: Re: [sqlite] Random error SQLITE_CANTOPEN on Windows XP SP2 with > sqlite3_exec > > You don't test for an error on your close statement. I suspect that the > Sqlite databases are not being closed because activity is not finalized. > Your error pops up when you have a very large number of databases open. > JS > > Costas Stergiou wrote: > > Hello everyone, > > > > I lately came upon a very strange error that occurs at random times. I > > managed to trace down and produce a small piece of code to reproduce it. > > > > I am using Delphi and the sqlite3.dll (latest) but I am sure that this > error > > is not related to something other than the engine. Here is a code that > > produces this error (read almost like pseudo-code): > > > > > > > > var > > > > i, j: Integer; > > > > s: String; > > > > db: pointer; > > > > MSG: pchar; > > > > begin > > > > for i:=1 to 30 do begin > > > > s := 'testsqlite3_' + inttostr(i) + '.db3'; > > > > deletefile(s); > > > > end; > > > > > > > > for i:=1 to 30 do begin > > > > s := 'testsqlite3_' + inttostr(i) + '.db3'; > > > > sqlite3_open(pchar(s), db); > > > > //sql_exec(db, 'PRAGMA synchronous = off;'); > > > > Assert( sqlite3_exec(db, pchar('create table t1(i1 int, i2 int)'), > nil, > > nil, msg) = SQLITE_OK ); > > > > Assert( sqlite3_exec(db, pchar('create table t2(i1 int, i2 int)'), > nil, > > nil, msg) = SQLITE_OK ); > > > > sqlite3_close(db); > > > > end; > > > > end; > > > > > > > > What I am doing here is just creating 20 test databases and creating 2 > > tables in each one of these. That's all. > > > > To repeat this error, the code above may need to be repeated some times > > (some time it gives the error, some other it doesn't). Between > invocations > > of the code it would be good to wait 1 second (I put it on a form and > > associate it with a button; then I press the button repeatedly until I > get > > the error, usually in 2-3 clicks). > > > > > > > > Now, if I uncomment the "PRAGMA synchronous=off" command, the error goes > > away! > > > > Also, if I remove the second create table command, I have no problem > again > > (the problem is not associated with the 'create table command' actually). > > > > > > > > Any help or insight on the above will be very valuable since I am > completely > > stack with it. > > > > Thanks, > > > > Costas > >
