Re: [mapserver-users] Oracle Layer: how to set context prior to fetching the data

[Michael Smith]

Martin,

How I've done this in the past is use a plsql function that sets the
context and call that function in the query (and just have the function
return a dummy value that you don't use).

Mike

-- 
Michael Smith

Remote Sensing/GIS Center
US Army Corps of Engineers



On 3/24/16,  5:59 AM, "mapserver-users on behalf of Martin Icking"
 wrote:

>One of the Oracle based sources we are publishing is using Oracle context
>variables to enable Oracle's fine grained access control.
>So we are in the need to set these context variables (e.g. current
>username)
>prior to doing the select defined by MapServer's DATA statement. In other
>applications we do that by calling a set_context (...) stored procedure
>prior to any data requests.
>Is there any possibility in MapServer to send a pre-request statement to
>the
>database? A current work-around is to set the context at logon time but
>that
>means that we need a new logon for every request that needs a different
>user
>context, not optimal for websites with many users. We'd prefer to have a
>single logon that can be re-used for all requests.
>If there is currently no way to handle this in MapServer we'd like to
>extend
>the Oracle layer's capabilities. Any suggestion by the MS developers on
>where we should place the needed extension in the mapfile (e.g. adding an
>additional keyword at the USING part of the data statement or using new
>layer metadata)?
>Any interest in generalizing this approach?
>
>Tx
>Martin
>
>
>
>--
>View this message in context:
>http://osgeo-org.1560.x6.nabble.com/Oracle-Layer-how-to-set-context-prior-
>to-fetching-the-data-tp5258155.html
>Sent from the Mapserver - User mailing list archive at Nabble.com.
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Re: [mapserver-users] Oracle Layer: how to set context prior to fetching the data

[Dan Little]

The other option is to create yet-another stored procedure wrapper.  In the
Mapfile, you'd call the special wrapper stored procedure and it would
return the rows to map.

On Thu, Mar 24, 2016 at 8:16 AM, Jeff McKenna  wrote:

> Hi Martin,
>
> Have you tried using a virtual spatial layer (.ovf) file to manage this?
> You can include a "" tag to run your stored procedure.  See
> examples at http://mapserver.org/input/vector/VirtualSpatialData.html
> More details of that driver at: http://www.gdal.org/drv_vrt.html
>
> Otherwise, I have seen others on this mailing list use stored procedures
> in the DATA statement of the mapfile, such as:
>
> DATA "the_geom from (select the_geom, id, name, myprocedure() as style
> from states) as foo using srid=4326 using unique id"
>
> Maybe the ovf is the way to go for your case, not sure.
>
> -jeff
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> http://www.gatewaygeomatics.com/
>
>
>
>
> On 2016-03-24 6:59 AM, Martin Icking wrote:
>
>> One of the Oracle based sources we are publishing is using Oracle context
>> variables to enable Oracle's fine grained access control.
>> So we are in the need to set these context variables (e.g. current
>> username)
>> prior to doing the select defined by MapServer's DATA statement. In other
>> applications we do that by calling a set_context (...) stored procedure
>> prior to any data requests.
>> Is there any possibility in MapServer to send a pre-request statement to
>> the
>> database? A current work-around is to set the context at logon time but
>> that
>> means that we need a new logon for every request that needs a different
>> user
>> context, not optimal for websites with many users. We'd prefer to have a
>> single logon that can be re-used for all requests.
>> If there is currently no way to handle this in MapServer we'd like to
>> extend
>> the Oracle layer's capabilities. Any suggestion by the MS developers on
>> where we should place the needed extension in the mapfile (e.g. adding an
>> additional keyword at the USING part of the data statement or using new
>> layer metadata)?
>> Any interest in generalizing this approach?
>>
>> Tx
>> Martin
>>
>>
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Re: [mapserver-users] Oracle Layer: how to set context prior to fetching the data

[Jeff McKenna]

Hi Martin,

Have you tried using a virtual spatial layer (.ovf) file to manage this? 
 You can include a "" tag to run your stored procedure.  See 
examples at http://mapserver.org/input/vector/VirtualSpatialData.html 
More details of that driver at: http://www.gdal.org/drv_vrt.html


Otherwise, I have seen others on this mailing list use stored procedures 
in the DATA statement of the mapfile, such as:


DATA "the_geom from (select the_geom, id, name, myprocedure() as style 
from states) as foo using srid=4326 using unique id"


Maybe the ovf is the way to go for your case, not sure.

-jeff

--
Jeff McKenna
MapServer Consulting and Training Services
http://www.gatewaygeomatics.com/




On 2016-03-24 6:59 AM, Martin Icking wrote:

One of the Oracle based sources we are publishing is using Oracle context
variables to enable Oracle's fine grained access control.
So we are in the need to set these context variables (e.g. current username)
prior to doing the select defined by MapServer's DATA statement. In other
applications we do that by calling a set_context (...) stored procedure
prior to any data requests.
Is there any possibility in MapServer to send a pre-request statement to the
database? A current work-around is to set the context at logon time but that
means that we need a new logon for every request that needs a different user
context, not optimal for websites with many users. We'd prefer to have a
single logon that can be re-used for all requests.
If there is currently no way to handle this in MapServer we'd like to extend
the Oracle layer's capabilities. Any suggestion by the MS developers on
where we should place the needed extension in the mapfile (e.g. adding an
additional keyword at the USING part of the data statement or using new
layer metadata)?
Any interest in generalizing this approach?

Tx
Martin



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[mapserver-users] Oracle Layer: how to set context prior to fetching the data

[Martin Icking]

One of the Oracle based sources we are publishing is using Oracle context
variables to enable Oracle's fine grained access control.
So we are in the need to set these context variables (e.g. current username)
prior to doing the select defined by MapServer's DATA statement. In other
applications we do that by calling a set_context (...) stored procedure
prior to any data requests.
Is there any possibility in MapServer to send a pre-request statement to the
database? A current work-around is to set the context at logon time but that
means that we need a new logon for every request that needs a different user
context, not optimal for websites with many users. We'd prefer to have a
single logon that can be re-used for all requests.
If there is currently no way to handle this in MapServer we'd like to extend
the Oracle layer's capabilities. Any suggestion by the MS developers on
where we should place the needed extension in the mapfile (e.g. adding an
additional keyword at the USING part of the data statement or using new
layer metadata)?
Any interest in generalizing this approach?

Tx
Martin



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