[Qgis-community-team] Materialised / Rule based views

[Richard Duivenvoorde]

Hi,

just because I stumbled upon this last month:

A materialized view is originally just a table based on a query. So you
should not update the 'view' as upon a refresh, those edits will be
overwritten.

Postgresql has an 'official' materialized view

https://www.postgresql.org/docs/9.3/static/sql-creatematerializedview.html

which you can 'refresh' using a query:

https://www.postgresql.org/docs/9.3/static/sql-refreshmaterializedview.html

I think the heading in the training_manual should be something like:
'rule based updates' or so?

Regards,

Richard Duivenvoorde



On 11-01-18 23:32, Tim Sutton wrote:
> Hi
> 
> I (or whoever wrote it) could probably have chosen a better example.
> Materialised views change something that is normally read only (a view)
> into something that can be treated as a writable table (with the correct
> transactions being deferred to the tables that were used to create the
> view). So agreed we should either change the example or the heading :-)
> 
> Regards
> 
> Tim
> 
>> On 11 Jan 2018, at 23:24, Anita Graser <anitagraser at gmx.at
>> <mailto:anitagraser at gmx.at>> wrote:
>>
>> Hi,
>>
>> I'm wondering about the term 
>> ​"
>> Materialised Views (Rule based views)
>> ​" in the lesson about rules:​
>> ​
>> https://docs.qgis.org/testing/en/docs/training_manual/database_concepts/rules.html
>>
>> Maybe I'm missing something, but it doesn't seem like the example has
>> anything to do with views. It's a nice rule that writes into a regular
>> table, as far as I can tell. 
>>
>> It would be good to provide an example that deals with inserting data
>> into a view. 
>>
>> What do you think about changing the subheading to "Creating a logging
>> rule"?
>>
>> Regards,
>> Anita
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> 
> *Tim Sutton*
> 
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