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help / color / mirror / Atom feedFrom: Dave Page <[email protected]>
To: Surinder Kumar <[email protected]>
Cc: pgadmin-hackers <[email protected]>
Subject: Re: [pgAdmin4][Patch]: RM1592 - Download as CSV should be supported for DDL
Date: Tue, 20 Sep 2016 10:03:14 +0100
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On Tue, Sep 20, 2016 at 6:43 AM, Surinder Kumar
<[email protected]> wrote:
>
> On Mon, Sep 19, 2016 at 8:59 PM, Surinder Kumar
> <[email protected]> wrote:
>>
>> On Mon, Sep 19, 2016 at 8:48 PM, Dave Page <[email protected]> wrote:
>>>
>>> Hi
>>>
>>> On Mon, Sep 19, 2016 at 3:03 PM, Surinder Kumar
>>> <[email protected]> wrote:
>>> > Hi
>>> >
>>> > Please find attached patch with fix.
>>> >>
>>> >> Download as CSV
>>> >> button should be enabled only for SELECT queries.
>>>
>>> I'm not sure there's a way to do this without parsing the query.
>>> Simply matching on ^select certainly won't work reliably - for
>>> example, there could be multiple statements in the script, or it could
>>> be PERFORM ... or UPDATE ... RETURNING ...
>>
>> I wasn't aware of such cases.
>>>
>>>
>>> I think we need to leave the button enabled, but give the user a
>>> message if no data is returned, e.g.
>>
>> ok. sure.
>
> I discussed the issue with Harshal and this is how download csv works:
> We just hit the url to download csv, and let the browser handle the response
> from the server side. we don't have access to response data to check if no
> data is returned.
Hmm, yeah that's true.
> The other approach is to hit the same query twice. First time an ajax query
> to check if data is returned or not. if returned, fire another query to
> download csv otherwise set message in message panel.
> But the limitation with this approach is that we are just increasing load
> over server by hitting same query twice, incase returned data rows in
> billions.
> Thoughts ?
Yeah, we can't do that.
The only thing I can think of right now is to simply write the error
message to the CSV file, e.g.
"The query executed did not return any data."
(with the quotes, so it's valid CSV). That way at least the user will
always get a file downloaded, and will see the error when they open
it.
--
Dave Page
Blog: http://pgsnake.blogspot.com
Twitter: @pgsnake
EnterpriseDB UK: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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Subject: Re: [pgAdmin4][Patch]: RM1592 - Download as CSV should be supported for DDL
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