Re: What is the C function to modify attribute

On 17 May 2018 at 15:36, a <372660931@qq.com> wrote:
> I am writing a trigger that will record all adjustment of the row into the
> last column of the row. I have done a iterator to produce text record and
> the last step would be add the text record into the last column (which
> designed as an array of user defined type, with the output function display
> the abstraction of update and a user defined function is used to retrieve
> detail update info).
>
> Now I would like to find a way that will allow me to update the last column
> in C efficiently.
>
> Can anyone help? Thank you so much!!

You might find https://www.postgresql.org/docs/10/static/triggers.html useful.

There's a complete example of a trigger function written in C there.

-- 
 David Rowley                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services