SQL Server trigger count updated columns before update












0















I have a table called "Users" with (id, name, lastname, dni, dob, city and lastUpdated)



What I want to do is, execute a trigger INSTEAD OF UPDATE and inside it count the number of columns that will be updated, and if the only column to be updated is "lasUpdated" column, then do not update anything.



CREATE TRIGGER USER_TRIGGER

ON USERS

INSTEAD OF UPDATE

AS

/* if the updated column is ONLY lasUpdated */

IF (COUNT(UPDATED_CLOUMNS) == 1 && UPDATED_COLUMN == "lasUpdated")

BEGIN 

ROLLBACK TRANSACTION

RETURN 

END

GO


Any idea of how can achieve it?
Thank you in advance.






sql-server triggers sql-update







share|improve this question


















  • 1





    Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

    – Dale Burrell
    Nov 26 '18 at 21:04








  • 1





    You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

    – Dale Burrell
    Nov 26 '18 at 21:08
















0















I have a table called "Users" with (id, name, lastname, dni, dob, city and lastUpdated)



What I want to do is, execute a trigger INSTEAD OF UPDATE and inside it count the number of columns that will be updated, and if the only column to be updated is "lasUpdated" column, then do not update anything.



CREATE TRIGGER USER_TRIGGER

ON USERS

INSTEAD OF UPDATE

AS

/* if the updated column is ONLY lasUpdated */

IF (COUNT(UPDATED_CLOUMNS) == 1 && UPDATED_COLUMN == "lasUpdated")

BEGIN 

ROLLBACK TRANSACTION

RETURN 

END

GO


Any idea of how can achieve it?
Thank you in advance.






sql-server triggers sql-update







share|improve this question


















  • 1





    Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

    – Dale Burrell
    Nov 26 '18 at 21:04








  • 1





    You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

    – Dale Burrell
    Nov 26 '18 at 21:08














0












0








0








I have a table called "Users" with (id, name, lastname, dni, dob, city and lastUpdated)



What I want to do is, execute a trigger INSTEAD OF UPDATE and inside it count the number of columns that will be updated, and if the only column to be updated is "lasUpdated" column, then do not update anything.



CREATE TRIGGER USER_TRIGGER

ON USERS

INSTEAD OF UPDATE

AS

/* if the updated column is ONLY lasUpdated */

IF (COUNT(UPDATED_CLOUMNS) == 1 && UPDATED_COLUMN == "lasUpdated")

BEGIN 

ROLLBACK TRANSACTION

RETURN 

END

GO


Any idea of how can achieve it?
Thank you in advance.






sql-server triggers sql-update







share|improve this question














I have a table called "Users" with (id, name, lastname, dni, dob, city and lastUpdated)



What I want to do is, execute a trigger INSTEAD OF UPDATE and inside it count the number of columns that will be updated, and if the only column to be updated is "lasUpdated" column, then do not update anything.



CREATE TRIGGER USER_TRIGGER

ON USERS

INSTEAD OF UPDATE

AS

/* if the updated column is ONLY lasUpdated */

IF (COUNT(UPDATED_CLOUMNS) == 1 && UPDATED_COLUMN == "lasUpdated")

BEGIN 

ROLLBACK TRANSACTION

RETURN 

END

GO


Any idea of how can achieve it?
Thank you in advance.






sql-server triggers sql-update




sql-server triggers sql-update






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 26 '18 at 21:00









user2246242user2246242

3616




3616








  • 1





    Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

    – Dale Burrell
    Nov 26 '18 at 21:04








  • 1





    You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

    – Dale Burrell
    Nov 26 '18 at 21:08














  • 1





    Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

    – Dale Burrell
    Nov 26 '18 at 21:04








  • 1





    You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

    – Dale Burrell
    Nov 26 '18 at 21:08








1




1





Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

– Dale Burrell
Nov 26 '18 at 21:04







Use columns_updated() (docs.microsoft.com/en-us/sql/t-sql/functions/…) you'll need to actually run the update and print the bit pattern to know which pattern you are looking for,

– Dale Burrell
Nov 26 '18 at 21:04






1




1





You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

– Dale Burrell
Nov 26 '18 at 21:08





You probably don't want an instead of update trigger either as you then have to manually carry out any desired updates. You can accomplish your stated goal with and after update trigger.

– Dale Burrell
Nov 26 '18 at 21:08












1 Answer
1






active

oldest

votes


















1














One way is do the update in your INSTEAD OF trigger with:



WHERE inserted.Col1<>deleted.Col1

OR inserted.Col2<>deleted.Col2

etc, for all columns except "lasUpdated"


Note that if any of the columns can be NULL, you'll need to handle that in the logic as well.






share|improve this answer
























  • thank you very much for the suggestion, it helped me a lot.

    – user2246242
    Dec 3 '18 at 17:21











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














One way is do the update in your INSTEAD OF trigger with:



WHERE inserted.Col1<>deleted.Col1

OR inserted.Col2<>deleted.Col2

etc, for all columns except "lasUpdated"


Note that if any of the columns can be NULL, you'll need to handle that in the logic as well.






share|improve this answer
























  • thank you very much for the suggestion, it helped me a lot.

    – user2246242
    Dec 3 '18 at 17:21
















1














One way is do the update in your INSTEAD OF trigger with:



WHERE inserted.Col1<>deleted.Col1

OR inserted.Col2<>deleted.Col2

etc, for all columns except "lasUpdated"


Note that if any of the columns can be NULL, you'll need to handle that in the logic as well.






share|improve this answer
























  • thank you very much for the suggestion, it helped me a lot.

    – user2246242
    Dec 3 '18 at 17:21














1












1








1







One way is do the update in your INSTEAD OF trigger with:



WHERE inserted.Col1<>deleted.Col1

OR inserted.Col2<>deleted.Col2

etc, for all columns except "lasUpdated"


Note that if any of the columns can be NULL, you'll need to handle that in the logic as well.






share|improve this answer













One way is do the update in your INSTEAD OF trigger with:



WHERE inserted.Col1<>deleted.Col1

OR inserted.Col2<>deleted.Col2

etc, for all columns except "lasUpdated"


Note that if any of the columns can be NULL, you'll need to handle that in the logic as well.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 26 '18 at 21:11









Tab AllemanTab Alleman

26.7k52440




26.7k52440













  • thank you very much for the suggestion, it helped me a lot.

    – user2246242
    Dec 3 '18 at 17:21



















  • thank you very much for the suggestion, it helped me a lot.

    – user2246242
    Dec 3 '18 at 17:21

















thank you very much for the suggestion, it helped me a lot.

– user2246242
Dec 3 '18 at 17:21





thank you very much for the suggestion, it helped me a lot.

– user2246242
Dec 3 '18 at 17:21




















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