I thought of downloading it, updating it, and then putting it back on
the server but that wouldn't work if two users simultaneously did so.
Since I'll have many users using the database simultaneously everything
has to be done on the server. I know only one user can write to an
sqLite database at a time, but that only takes about 20 milliseconds if
done on the server and the other writes get cued, something that
wouldn't happen in the download/re-upload scenario.
I do like your suggestion regarding middleware on the server to update
it in place. You wouldn't happen to have any experience with something
that works well in this scenario would you? Something which works well
with Livecode, an sqLite database, and on a Linux server?
On 4/5/2016 11:20 PM, Mike Bonner wrote:
Ah. Do you need to update the file in place, or just be able to use it with
your app? If the second, you might put url "
http://54.210.118.224/Downloads/yourfile.sqlite"; into URL
(specialfolderpath("tmp") & "/yourfile.sqlite")
at which point you can use revopendatabase to open the local copy of the
file at (specialfolderpath("tmp") & "/yourfile.sqlite")
If you need to be able to update the file in place you'd probably be better
off using middleware on the web server and send your requests that way.
On Tue, Apr 5, 2016 at 8:51 PM, Ray <r...@linkit.com> wrote:
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 <r...@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 <r...@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 <r...@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 <r...@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?
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Office of Digital Humanities
Brigham Young University
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