On 02/23/2015 12:42 PM, J Decker wrote: > I see; the first part... > > " result of the pragma or the error message if the pragma fails" I missed > the or part... or rather missed the part before the or. > > On Sun, Feb 22, 2015 at 8:13 PM, J Decker <d3ck0r at gmail.com> wrote: > >> So now that I have the added complexity of my own vfs in which to make a >> sqlite vfs... I'm having some issues. >> >> Hmm... >> One of the first things I do is 'pragma journal_mode=WAL' >> I return sqlite_ok; but the result has 0 columns, whereas my command line >> tool returns a column 'journal_mode' and a row 'WAL'.. >> >> is WAL somehow dependant on the VFS?
Only in that sqlite3_io_methods.iVersion needs to be 2 or greater. i.e. you need to implement the xShmXXX() methods. >> >> I was just going to note, that although I'm setting wall, and it does 3 >> probes to see if the wal file exists... and probes a lot actually - though >> I guess it's assuming other processes are going to be manipulating the >> file? (is there a compile option to disable that, and assume it's the only >> one with access to the database?) If you set "PRAGMA locking_mode=EXCLUSIVE" it won't do that. Of course, then you're limited to at most one sqlite3* handle. Or, it will stop probing if it is actually in wal mode. Dan.
