[Tarantool-patches] [PATCH] sql: reset values to be bound after execution

[Nikita Pettik]

On 03 Apr 23:23, Eugene Leonovich wrote:
> On Fri, Apr 3, 2020 at 8:22 PM Nikita Pettik <korablev at tarantool.org> wrote:
> 
> > +execute(s.stmt_id, {{[':a'] = 1}, {[':b'] = 2}});
> > + | ---
> > + | - metadata:
> > + |   - name: :a
> > + |     type: integer
> > + |   - name: :b
> > + |     type: integer
> > + |   - name: :c
> > + |     type: boolean
> > + |   rows:
> > + |   - [1, 2, null]
> >
> 
> I wonder, shouldn't an error be thrown if there are not enough parameters
> passed?

I guess it works just as it was implemented long ago. Some users may
rely on this 'feature'. So personally I would rather not change it.

> I just checked Postgres and MySQL, optional parameters are forbidden on
> both systems:
> 
> Postgres
> ------------------------------------------------------------------------------------------
> PREPARE foo (int, int, int) AS SELECT $1, $2, $3;
> EXECUTE foo(1, 2, 3);
>  ?column? | ?column? | ?column?
> ----------+----------+----------
>         1 |        2 |        3
> (1 row)
> 
> EXECUTE foo(1, 2);
> ERROR:  wrong number of parameters for prepared statement "foo"
> DETAIL:  Expected 3 parameters but got 2.
> ------------------------------------------------------------------------------------------
> 
> MySQL
> ------------------------------------------------------------------------------------------
> PREPARE foo FROM 'SELECT ?, ?, ?';
> 
> 
> SET @a = 1;
> 
> 
> SET @b = 2;
> 
> 
> SET @c = 3;
> EXECUTE foo USING @a, @b, @c;
> +------+------+------+
> | ?    | ?    | ?    |
> +------+------+------+
> | 0x31 | 0x32 | 0x33 |
> +------+------+------+
> 
> EXECUTE foo USING @a, @b;
> ERROR 1210 (HY000): Incorrect arguments to EXECUTE
> ------------------------------------------------------------------------------------------
> 
> 
> -- 
> Thank you and best regards,
> Eugene Leonovich