SQL Server：检测列更改

Question

I am trying to detect any changes in a column. Let me describe my problem exactly.

Let's say I have 400 stored procedures and 20 of them changes a column named ModDate in a table Users . But the ModDate column is not enough for me to achieve my goal. I need a dirty bit column let's say IsChanged .

My solution would be find and check the procedures that updates Users.ModDate and change these procedures to update IsChanged as well. But this is not efficient in time. Also, I may miss some procedures and this will cause problems.

So, my question; is it possible to alter a table/column to create an "on change" trigger? When any procedure changes the value of Users.ModDate , SQL Server will update the IsChanged column as 1 automatically.

Thanks for your answers.

Answer 1

You can create a trigger on a column for different crud events.

See https://www.sqlservertutorial.net/sql-server-triggers/sql-server-create-trigger/

`CREATE TRIGGER [schema_name.]trigger_name ON table_name AFTER {[INSERT],[UPDATE],[DELETE]} [NOT FOR REPLICATION] AS {sql_statements`}