Very interesting information! Thanks!

G’night

To be even more useful, SIGNAL should also return some user defined informations.

Before you get involved in any further development, however, be aware that in MySQL road map there is a plan to develop SIGNAL, RESIGNAL, and GET DIAGNOSTICS. You are free to develop your patch, but it’s only fair that we let you know that, since we have ambitious plans, your patch is not likely to be included in our code base.
I might be wrong about it. If you feel like doing more, please submit a proposal to MySQL “internals” mailing list (http://lists.mysql.com/internals) and then attach you patch to the feature request for SIGNAL (http://bugs.mysql.com/bug.php?id=11661).

Best regards

Giuseppe

delimiter //

drop procedure if exists less_than_10 //
create procedure less_than_10(i int )
deterministic
begin
if ( i call less_than_10(2);
+————————————————–+
| comment |
+————————————————–+
| everything fine [a valid number was entered (2)] |
+————————————————–+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql> select @comment;
+——————————–+
| @comment |
+——————————–+
| a valid number was entered (2) |
+——————————–+
1 row in set (0.00 sec)

mysql> call less_than_10(12);
ERROR 1340 (38503): Exception generated from user-defined function/procedure
mysql> select @comment;
+———————-+
| @comment |
+———————-+
| number too high (12) |
+———————-+
1 row in set (0.00 sec)

mysql> call trapping();
+————————————————–+
| comment |
+————————————————–+
| everything fine [a valid number was entered (7)] |
+————————————————–+
1 row in set (0.00 sec)

+———-+——————————–+
| mystatus | @comment |
+———-+——————————–+
| ok | a valid number was entered (7) |
+———-+——————————–+
1 row in set (0.00 sec)

+———-+———————-+
| mystatus | @comment |
+———-+———————-+
| ERROR | number too high (17) |
+———-+———————-+
1 row in set (0.00 sec)

+—————————–+
| and this is after the error |
+—————————–+
| and this is after the error |
+—————————–+
1 row in set (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

just wanted to ask you, the copy of the standard I’m currently using goes like this:

ISO/IEC 9075-4:2003 (E)

::=
SIGNAL [ ]

::=

|

::= SET

::=
[ { }... ]

::=

And this:

::= SQLSTATE [ VALUE ]

and this

::=
[ ]
[ ... ]
[ { [ ... ] }… ]

Anyway, this leads me to believe that it should be possible to pass whatever SQL state, and even a condition identifier of a previously defined condition.

So something like

SIGNAL SQLSTATE ‘22000′

should work just fine.

However, I just noticed that that gives a syntax error. Can you show a real syntax example? Or is this the only valid syntax now:

SIGNAL SQLSTATE ‘38503′

or even

SIGNAL SQLSTATE 38503

(if so, I think the latter would violate the grammar of my copy of the standard)

great work! I’ll try and get someone to contact you about this.

Roland