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sql server trigger to modify permissions to add records to a table?

Posted on 2006-06-23
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Last Modified: 2012-06-27
is it possible to modify the permissions for a table (allow them to add records when they can't cuz they belong to a group that prohibits) to 2 individuals via a trigger? it only affects one table and should happen when they add records. tia!
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Question by:ironpen45
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16969136
the trigger cannot modify permissions, and anyhow, the trigger will not fire if permissions are not set to allow to add records to the table anyhow.

so, to allow insert on a table, you have to go another way:
* use a stored procedure that does the insert
* create a view to which you can grant the insert

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Author Comment

by:ironpen45
ID: 16969310
how can an sp execute the insertion? can an sp override restrictions on a table? doesn't the same apply to a view as well?
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Expert Comment

by:Atlanta_Mike
ID: 16969372
If I understand you correcetly, what angel is saying is you assign can permissions to the stored procedure for doing inserts. If a person doesn't have permission to run the procedure for the insert.

OR You can use a view to grant permissions to some people but not others for the insert.
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16969378
> how can an sp execute the insertion?
>can an sp override restrictions on a table?

Sample code:
CREATE TABLE dbo.test_table ( data varchar(20))
GO
CREATE PROCEDURE dbo.test_proc ( @data varchar(20))
AS INSERT INTO dbo.test_table (data) select @data
GO

now, grant execute permissions to the user for that procedure, not NO permissions on the table.
confirm that the user cannot insert into the table directly.
let the user run the procedure with a parameter, confirm that after the procedure run, the record got inserted to the table

The explanation:
* the procedure owner (dbo) needs to have the permissions to insert to the table,
* the executor or the procedure does NOT need the permissions to the table, only to execute the procedure.

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Author Comment

by:ironpen45
ID: 16969641
i c. so, i have an msa mdb front end. the form's record source is the table in question, and i'm 1 of 2 end users who need to enter records to the table via the form.

how can i make this happen? eg, does the record source have to change? on do i need a command button to execute the sp?
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16969782
I know that one can connect with MS Access directly to a sql server database, and have done so for some small configuration tables already, but I don't really like this for multi-user / prod applications, at least not with simple-bound forms.

ie, you would have to have the form unbound, and control all the data display and data save operations manually (by code), using the stored procedures.
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Author Comment

by:ironpen45
ID: 16970697
r u saying that from the unbound form, with the new data in the corresponding controls, execute the sp that will enter the new values into the restricted table? i gather that from ur example, unless i'm misunderstanding u. thanks.
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by:Guy Hengel [angelIII / a3]
ID: 16972231
yes, you got that correct!
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Author Comment

by:ironpen45
ID: 16972246
i just thought of an alternative, a bit simpler than an sp:

i can modify the table for full access to all users, but then a trigger will test whether someone is authorized to enter a record into the table. if the end user is not authorized, the entry is rejected.

can anyone help me with a sample trigger?
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Author Comment

by:ironpen45
ID: 16972255
how about it, angelIII? for 300 pts?
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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 16972296
create trigger trg_check_permissions
  on yourtable
  for update
as
  IF ( <check permissions of user are not good> )
  BEGIN
     ROLLBACK
     RAISERROR (16,1,'You do not have good permissions' )
  END
GO


hope this helps
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Author Comment

by:ironpen45
ID: 16972495
so my trigger would look like this?:

****************
create trigger trg_check_permissions
  on PtblVendor
  for insert
as
  IF ( user='hhenke' or user='kgrecco' or user='psangabriel' or user='mjperry' )
  BEGIN
     ROLLBACK
     RAISERROR (16,1,'You do not have good permissions' )
  END
GO
****************
thanks!
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Author Comment

by:ironpen45
ID: 16972504
actually it's allow the 4 users!:

****************
create trigger trg_check_permissions
  on PtblVendor
  for insert
as
  IF ( user<>'hhenke' or user<>'kgrecco' or user<>'psangabriel' or user<>'mjperry' )
  BEGIN
     ROLLBACK
     RAISERROR (16,1,'You do not have good permissions' )
  END
GO
****************
thanks!
0
 

Author Comment

by:ironpen45
ID: 16972520
i tested it an it's giving me an error 'You do not have good permissions'
0
 

Author Comment

by:ironpen45
ID: 16972536
oops, it's:

Error 170: Line 8: Incorrect syntax near 'You do not have good permissions'
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 325 total points
ID: 16972788
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_ra-rz_5ooi.asp

sorry, i reversed the order of the arguments:

     RAISERROR ('You do not have good permissions' ,16,1)
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