Question

I have got a table in an SQL Server 2008 R2 database. It contains X, Y and Shape columns for storing numeric(38, 8) for Longitude and Latitude and Computed Column for Geometry type. The idea is whenever X and Y are inserted, Shape column should automatically be filled with the correct Geometry data.

X and Y are populated. However, I have been unsuccessful in specifying the Shape column. In SQL Server Management Studio, it gave me errors of failing validating formula when I populated either of the following codes in Formula of Computed Column Specification:

(STGeomFromText('POINT (' + CAST([x] as varchar(32)) + ' ' + CAST([y] as varchar(32)) + ')', 4283))

OR

([STGeomFromText]('POINT (' + CAST([x] as varchar(32)) + ' ' + CAST([y] as varchar(32)) + ')', 4283))

Could anyone give me a hand? Thanks!

Cheers,
Alex

Answer 1

I was actually then enlightened by this post.

Hope it helps to anybody else who has the same question.

ALTER TABLE LOCATION
ADD Shape AS (CONVERT(GEOMETRY, CASE WHEN x<> 0
                                    AND y<> 0
                               THEN GEOMETRY::STGeomFromText('POINT('
                                                          + CONVERT(VARCHAR, x)
                                                          + ' '
                                                          + CONVERT(VARCHAR, y)
                                                          + ')', 4238)
                               ELSE NULL
                          END))