Re: Thanks! Re: Who adds the "start transaction" and "commit" to the intended SQL statement in "autocommit" mode?

On Mon, Feb 20, 2023 at 12:57 PM Bryn Llewellyn <bryn(at)yugabyte(dot)com> wrote:

> 3. Chapter 55 also has a section "Multiple Statements In A Simple Query".
> But this feature seems to do no more semantically beyond implicitly
> achieving what I could do by surrounding several statements explicitly with
> "begin; ... commit;". There is, though, the non-semantic aspect of
> round-trip reduction. It seems that psql doesn't expose doing many
> statements in a simple query. (At least, that's what I see in the server
> log when I put several statements on a single line (with psql's autocommit
> on).
>

IIRC psql -c 'insert into tbl values (1); select * from tbl;' uses the
simply query protocol with multiple statements.

Then, 55.2.2.1:

> When a simple Query message contains more than one SQL statement
(separated by semicolons), those statements are executed as a single
transaction

So in effect bundling within the Simple Query Protocol has a similar effect
to wrapping all statements in a begin/commit pair.

David J.