[gdal-dev] ogr2ogr SQL Date Calculation

[Langford, Robert]

All,

I am trying to use ogr2ogr as a scheduled command line task to run weekly to convert a .SHP file to a .TAB file whilst filtering the data based on a date field.  I would like to only convert records that have a date from the last 30 days.

Therefore If the task ran today (11/07/2011) the below line would return the required data:

ogr2ogr -f "MapInfo File" -sql "select * from DCPOLY where DATE_CREA1>'2011/06/11'" D:\Data\Plan_Apps.tab D:\Data\DCPOLY.shp

Obviously if the task ran tomorrow the date would have to be changed to '2011/06/12'.  So I need the field SQL to be something like:

DATE_CREA1> Todays_Date - 30

Does anyone know of a way to automate this using something like; GetDate(), Now(), sysdate, Date /t, etc?  Any help would be greatly appreciated.

Many thanks,

Rob


Robert Langford
Systems Developer (GIS)
Corporate Applications Team
Salford City Council

Tel:      0161 793 2492
Email:  robert.langford at salford.gov.uk<mailto:robert.langford at salford.gov.uk>
Web:    www.salford.gov.uk<http://www.salford.gov.uk/>

Salford Civic Centre,
Chorley Road, Swinton, M27 5DA




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