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POTrigger for INSERT and UPDATE on same table
 

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    <p>as all of us know, entity framework can't hold geography data. So my idea was, to specify the longitude and latitude as decimal in my model. After executing the SQL script for creating the tables I would start another script for adding a geography column. Then I would like to update this column on every INSERT or UPDATE (on longitude and latitude) by a trigger. Is the following trigger okay, or is it something bad? I'm asking because I'm not very familiar with trigger, but it works for now.</p> <pre> <code> CREATE TRIGGER Update_Geography ON [People] FOR INSERT, UPDATE AS BEGIN DECLARE @longitude DECIMAL(8, 5), @latitude DECIMAL(8, 5) SET @longitude = (SELECT ins.Location_Longitude FROM inserted ins) SET @latitude = (SELECT ins.Location_Latitude FROM inserted ins) IF (@longitude != 0 AND @latitude != 0) BEGIN UPDATE [People] SET Location_Geography = geography::STGeomFromText('POINT(' + CONVERT(VARCHAR(100),@longitude) + ' ' + CONVERT(VARCHAR(100),@latitude) + ')',4326) WHERE Id = (SELECT ins.Id FROM inserted ins) END END </code> </pre> <p>Would be glad if someone could help me.</p> <p>Regards</p> <p><strong>Edit:</strong></p> <p>script looks like that:</p> <pre> <code> ALTER TABLE [People] ADD Location_Geography AS ( CONVERT(GEOGRAPHY, CASE WHEN Location_Latitude 0 AND Location_Longitude 0 THEN geography::STGeomFromText('POINT(' + CONVERT(VARCHAR, Location_Longitude) + ' ' + CONVERT(VARCHAR, Location_Latitude) + ')',4326) ELSE NULL END ) ) </code> </pre> <p>works but can't query that column :/ Thx</p>
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    1. COYour trigger will cause data integrity problems if any process ever updates or inserts a batch of records. Never write a trigger assuming only one record will be in inserted.
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    2. COhow to modify it?
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    3. COVote for this Connect item: http://connect.microsoft.com/SQLServer/feedback/details/378126/how-to-persist-a-calculated-geometry-or-geography-column
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