Error: Unable to open the database file

Ralph DiMola rdimola at evergreeninfo.net
Wed Apr 6 09:54:39 EDT 2016 

Ray,

An http file reference is not a valid UNC for read/write file access. If you
want to connect remote users to a DB then import the SQLite DB into a MySQL
DB and have the users connect to the MySQL server and all the record locking
would be in place. You could go LC server middleware but that would be a
fair amount of work.

Ralph DiMola
IT Director
Evergreen Information Services
rdimola at evergreeninfo.net

-----Original Message-----
From: use-livecode [mailto:use-livecode-bounces at lists.runrev.com] On Behalf
Of Ray
Sent: Tuesday, April 05, 2016 10:51 PM
To: use-livecode at lists.runrev.com
Subject: Re: Error: Unable to open the database file

Mike - if I set the folder to the area I've set up to work with this,
"http://54.210.118.224/Downloads/", I get "can't open that directory" 
returned in the result.  I can read files at that location but I get an
"error 405 method not allowed" if I try to write files to that location.
Could that be the problem?

Regarding mapping the server to a drive letter or mounting it to a folder on
the local system, even if that worked I wouldn't be able to expect my end
users to do that so it's kind of out unless I'm missing something.

Thanks for your input and let me know if anything else comes to mind.

On 4/5/2016 10:33 PM, Mike Bonner wrote:
> can you map the server to a drive letter?  (or mount it to a folder on 
> the local system)  If so, that might help.
>
> Alternatively, can you "set the folder.." to a path on the server and 
> see "the files"?  If you can successfully set the default folder, then 
> you can just supply the filename and see if it behaves differently.
>
> On Tue, Apr 5, 2016 at 5:58 PM, Ray <ray at linkit.com> wrote:
>
>> I did read some about the file locking issues so I'll continue to 
>> look into that.
>>
>> Regarding testing with sqLite3, I'm not sure what to do with it.  I 
>> downloaded the pre-compiled binary for Windows 64.  It gave me 2 
>> files, sqlite3.def and sqlite3.dll but I'm not sure what to do with 
>> them.  Shell commands from within Livecode don't work.  Suggestions?
>>
>>
>> On 4/5/2016 7:22 PM, Peter Haworth wrote:
>>
>>> 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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