Обсуждение: How to tell which statement is being executed

Hi All,

If I create a C function, is there a way from within that function for me to:

1. know whether it is being triggered by an INSERT or UPDATE statement
   1. I’ve done some digging and it seems you can get this information if you provide a Planner hook, however, I need to know this much later in my function not in the Planner
   2. Is there some way for me to get to the PlannedStmt (or anything else that may have the command type) from within my function?
2. column attribute (specifically the TYPMOD) for the affected column

BTW, is there a more appropriate Postgres list/group/blog that is specifically dedicated to these types of programming questions or is it ok to post this here?

Regards,

Garfield

> It might not be any of those.  But if what you want is the most closely
> nested SQL action, inspecting the ActivePortal might help (see
> function_parse_error_transpose, which I think is the only in-core user).

Thx, Tom… will see if this ActivePortal helps…

> No.  How would you even define "affected column"?

Not sure I just assumed that the attributes for column being processed would be saved somewhere in some structure somewhere. After all, at some point if for instance I created a CHAR(10) column and attempted to insert a CHAR(15) that is returned by my function then Postgres will need to generate a truncation warning so it must know the TYPMOD of the column to do so.

Regards

Garfield