You have to implement m:n relationships yourself inside of your plugin
if you need that. I recommend trying to use an ORM like sql-alchemy to
make life easier.

FYI there's also some cool Offline plugins that let you take Postgis
tables offline in a temporary spatialite db, and then sync when back online.


On 09/30/2016 11:37 AM, Tyler Veinot wrote:
> That was my thought for a solution, do the data entry in QGIS and use that
> as the primary got to for entry and data retrieval using data entry forms
> and widgets. Issue has been the m:n relationships. I downloaded postgreSQL
> portable to try and since upgrading to 2.16.3 I have not tried my SQLite
> forms to see if they work better as of yet; hoping to get to it this
> weekend but I got quite a bit of work to do before I can get back to it.
> Likely going to have to go with PostgreSQL; it is the only one that works
> well with both platforms.
> Tyler
> On Fri, Sep 30, 2016 at 2:27 PM, Alex M <> wrote:
>> I looked for this unicorn many moons ago. It sadly doesn't exist. I have
>> not found any interface quite like Access (which I have successfully
>> used via ODBC to sqlite). Libre Base comes close but there's been many
>> years of them saying they'd implement sqlite as a 1st class db and no
>> movement, they always prefer Java based solutions it seems.
>> The conclusion I reached is that you need either a web or local
>> interface to your db. For data entry I looked into writing a custom
>> Python application with the widgets I wanted for data entry, a node type
>> app could work also (share code between a web interface and desktop
>> interface). One option would be to make custom forms, or a plugin for
>> QGIS and do all your data entry there.
>> For writing queries there's lots of GUI tools, I usually use Spatialite
>> GUI, QGIS QSpatialite Plugin, or Firefox SQLite Manager (non-spatial
>> queries only). But both of these would be terrible for mass data entry.
>> You could also, do a spreadsheet->csv->db script
>> Thanks,
>> Alex
>> On 09/28/2016 11:06 AM, Tyler Veinot wrote:
>>> Luigi;
>>> Thanks, I will give it a try. Also tried using using MS Access to connect
>>> to the SQLite database following steps I found online using an ODBC
>>> connection. Got no useable sqlite3.dll found. It doesn't tell me where it
>>> is looking or anything; the ODBC driver install did put an sqlite3.dll in
>>> the system32 folder so I am not sure what the issue is, if the file is
>> not
>>> what access is looking for or if it is looking in the wrong spot for it;
>>> Libre seems to be able to find it no problem.
>>> Tyler
>>> On Wed, Sep 28, 2016 at 1:22 PM, Luigi Pirelli <> wrote:
>>>> Tyler may you try with latest backported bugfixes on sqlite ogr
>>>> provider? Probably related with your problem ("unable to commit
>>>> changes to the database"). Check if it is similar following these
>>>> steps:
>>>> regards
>>>> Luigi Pirelli
>>>> ************************************************************
>>>> **************************************
>>>> * Boundless QGIS Support/Development: lpirelli AT boundlessgeo DOT com
>>>> * LinkedIn:
>>>> * Stackexchange:
>>>> * GitHub:
>>>> * Mastering QGIS:
>>>> ************************************************************
>>>> **************************************
>>>> On 28 September 2016 at 17:54, Tyler Veinot <>
>>>> wrote:
>>>>> I would prefer to go with postgre but I think that is going to have to
>>>> be a
>>>>> future project; right now we use a file geodatabase because it can be
>>>> copied
>>>>> and distributed. Some of our PC's are disconnected from a network
>> and/or
>>>>> have very limited network access. To my knowledge I cannot just copy a
>>>>> Postgres, MySQL, Maria, or other like databases to a PC or tablet and
>> run
>>>>> them. I have run Postgre as a local service doing some testing and
>>>> playing
>>>>> but I have no place to put it for everyone to access, thats why I am
>>>> looking
>>>>> for a SQLite/File geodatabase type solution.
>>>>> SQLite's only issue is that the qgsEditRelationWidget and
>>>> qgsRelationWidget
>>>>> don't seem to respond well to it. I have tried a number of different
>>>> ways to
>>>>> make those features work and it always ends in either a crash with
>>>> minidump
>>>>> or "unable to commit changes to the database". LibreBase does not
>>>>> acknowledge SQLite's capabilities as a database; tried it with both
>>>> and
>>>>> ODBC drivers. I can build but cannot edit tables, will not support
>>>> relations
>>>>> or SQL Queries containing inner, outer, or full joins.
>>>>> What about a GUI for SQLite? Something like Access for SQLite
>> databases?
>>>> If
>>>>> there was such a thing I could move the data entry to that; looks like
>> I
>>>>> have some googling to do.
>>>>> Tyler
>>>>> On Wed, Sep 28, 2016 at 12:01 PM, John Harrop <>
>>>> wrote:
>>>>>> You could run it as a local server and it is available on all major
>>>>>> platforms.  If you need a server with wider access you could look at
>> AWS
>>>>>> (even the free tier will give you some RDB service).  The Postgresql
>>>>>> supported there has the PostGIS extension ready to load so for us it
>>>> was a
>>>>>> logical choice for hosting spatial data.
>>>>>> John Harrop
>>>>>>> On Sep 27, 2016, at 8:09 AM, Tyler Veinot <>
>>>>>>> wrote:
>>>>>>> Hello;
>>>>>>> I need some database options; I tried PostgreSQL, HSQL,
>>>>>>> SQLite/Spatialitem, Access (mdb/accdb) and what I get is either it
>>>> works
>>>>>>> well with QGIS and doesn't work well at all with LibreBase or vice
>>>> versa,
>>>>>>> with the exception of PostgeSQL which works well with both but I
>>>> don't have
>>>>>>> a server to run it on. Are there any other databases that you can
>>>> suggest?
>>>>>>> With no server at the moment I would like something that exists in a
>>>> file in
>>>>>>> the same way; SQLite, Access, or file geodatabases do, but also
>>>> compatible
>>>>>>> with QGIS and LibreBase.
>>>>>>> Thanks;
>>>>>>> Tyler
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