Re: "Locking rows"

On 8/12/19 10:51 AM, stan wrote:
> I have a customer requirement/desire. The system is (among other things)
> essentially a employee time sheet. The manager wants for an employee to not
> be able to modify a given row in the table they enter time into once it is
> committed. I personally see issues with this, but I am willing to try to give
> him what he wants. If it creates issues we can sort them out, once he sees
> the issues.
>
> The only way I see to do this is to add a column (call it lock). I will
> then set this up as a default entry with a value of TRUE. The form the
> employee uses to enter this will, of course, not display this column. The
> I will create a function that on UPDATE, checks for the presence of the 1 in
> this row, and rejects the update. Then I will give the manager a form where
> he can set this flag to FALSE.
>
> Looks ugly, and convulsed to me.
>
> Is here a more "database native" way to handle this?

Depends on who is doing the database record changes.

In other words are there defined roles:

https://www.postgresql.org/docs/11/sql-createrole.html

for the object(table) and the entity working with the table?

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com