Spatial References in SQL Server 2008, Part 2

database, gis, postgis, sql server, sql server spatial 1 Minute

With some guidance from Paul Ramsey, I implemented a check constraint on my sample table to allow only a single SRID in a table. As Paul indicated in his comment on my previous post, PostGIS does this for you. SQL 2008 doesn’t yet but I hope it does. The syntax for my table was:

[sourcecode language=”sql”]
–only allow WGS84
ALTER TABLE SpatialTable
ADD CONSTRAINT enforce_srid_geometry CHECK (GeomCol1.STSrid = 4326);
[/sourcecode]

After doing that, the following SQL will properly fail:

[sourcecode language=”sql”]
UPDATE SpatialTable
SET GeomCol1.STSrid = 4127;
[/sourcecode]

Thanks to Paul for chiming in!

Published by Bill Dollins

Published

2 thoughts on “Spatial References in SQL Server 2008, Part 2”

  2. Thanks! That’s a great trick.
    I agree with you that this should be a standard constraint, and you should make sure you let the SQL Server Spatial know! At least I will always add this to my tables and tools to avoid any issues.

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