Spatial References in SQL Server 2008, Part 2

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!

  • Morten

    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.

  • Morten,

    I’m glad you found it useful and I’ll definitely send the feedback to MS. Thanks for stopping by!