Error: Unable to open the database file

Peter Haworth pete at lcsql.com
Tue Apr 5 19:22:08 EDT 2016


I suppose I should also mention the usual caveat about using sqlite over a
networked file system, which is that sqlite relies on file system locking
to preserve data integrity and some networked file systems are buggy in
that area according to the sqlite website.

On Tue, Apr 5, 2016, 3:57 PM Ray <ray at linkit.com> wrote:

> Peter - thanks for jumping in here.  Yes, I can read and write files to
> this location and, as a matter of fact, I can even do a straight read of
> the database file on the server and get the same cryptic characters back
> I get when I read the local copy.  I just can't establish a connection
> to it for the purpose of issuing revDatabase calls.
>
> You're right when you say the "unable to open the database file" is not
> very informative.  I get the same message when I try that on an empty
> path on the server.
>
> I'll try your sqLite3 suggestion and let you know how it works.
>
> Thanks!
>
> On 4/5/2016 6:34 PM, Peter Haworth wrote:
> > You might want to try opening the database with something other than
> > Livecode in hope that you will get a more informative error message.
> >   sqlite3 is the official sqlite command line tool.  It's distributed
> with
> > OSX but not sure if it's included with Windows.
> >
> > Are you able to access any other files in the same directory as the
> sqlite
> > db?
> >
> > On Tue, Apr 5, 2016 at 1:31 PM Ray <ray at linkit.com> wrote:
> >
> >> Devin - thanks for the idea but that's not it.  I just checked and
> >> everything on my Windows 8.1 system matches case with the database file
> >> path on the Linux server.  I even tried changing the name of the
> >> database file to all lower case but that didn't work either. Thanks...
> >>
> >> On 4/5/2016 3:38 PM, Devin Asay wrote:
> >>> Ray,
> >>>
> >>> You may have moved your DB file from a system that is not case
> >> sensitive, like MacOS, to one this is case sensitive, like Linux. Do
> all of
> >> your folders and file names have the same exact spelling, including
> upper
> >> and lower case letters, as the string in your path variable?
> >>> Devin
> >>>
> >>>
> >>>> On Apr 5, 2016, at 12:39 PM, Ray <ray at linkit.com> wrote:
> >>>>
> >>>> ...one other note.  I'm guessing calls to sqLite need drivers. These
> >> drivers are probably built in to Livecode and the OnRev server which
> would
> >> explain why LC's database commands works so well locally and with the
> OnRev
> >> based samples.
> >>>> If this is the problem, does anybody know how I could install these
> >> drivers on my own server?
> >>>> On 4/5/2016 1:18 PM, Ray wrote:
> >>>>> I've never worked with sqLite databases before but it appears I
> should
> >> be able to access one on a server pretty much the same as I do locally.
> >>>>> Here's what I've done:
> >>>>>     put revOpenDatabase("sqLite",localPath) into theDbId
> >>     -- this creates a zero K local database file
> >>>>>     put "CREATE TABLE bugs(Name char(50), Date char(50))" into
> myQuery
> >>>>>     revExecuteSQL theDbId,myQuery -- the local database file is no 2
> K
> >>>>>
> >>>>>     revCloseDatabase theDbId -- close it or I won't be able to copy
> it
> >> to the server
> >>>>> I then copy the local database file to a remote server and make sure
> >> all 9 permissions are checked (777).
> >>>>> I now load the well-tested server path into the variable dbPath and
> >> try this:
> >>>>>     put revOpenDatabase("sqLite",dbPath) into myResult
> >>>>>
> >>>>> but all I get back is:
> >>>>>     Error: Unable to open the database file
> >>>>>
> >>>>> Suggestions?
> >>>> _______________________________________________
> >>>> use-livecode mailing list
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> >>> Devin Asay
> >>> Office of Digital Humanities
> >>> Brigham Young University
> >>>
> >>>
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