Comments on: Emulating nextval() function to get sequence in MySQL

By: christophe

christophe — Fri, 18 Nov 2011 09:46:35 +0000

Hi there !
I have the same error as Jagpreet Singh. Have you fixed it ? Please help

By: Jagpreet Singh

Jagpreet Singh — Wed, 05 Oct 2011 08:13:16 +0000

Great help!! But i could not succeed. I am facing following problem -
Error Code: 1418. This function has none of DETERMINISTIC, NO SQL, or READS SQL DATA in its declaration and binary logging is enabled (you *might* want to use the less safe log_bin_trust_function_creators variable)

By: Rajesh

Rajesh — Wed, 28 Sep 2011 06:56:37 +0000

Thanks!
Very useful solution

By: Jan

Jan — Mon, 19 Sep 2011 15:37:41 +0000

Thanks for the post, very clever idea. For the latecomers it would be nice if you could update your original post with the code from CesarDraw. Your original function code does not work as is.

Best regards,
Jan

By: Zeljko

Zeljko — Sun, 06 Feb 2011 13:39:58 +0000

Great post! Thanks

By: Vishal

Vishal — Thu, 23 Sep 2010 07:56:09 +0000

Thanks Maresa,
But i was thinking writing function in DB, which will take care all commit operation as well (i.e. inside Function – nextval). So user of function would not bother about any commit operation.

But here in function we cannot fire commit as – it is not allowed in mysql (explicit implicit commit).
So i was wondering any other way to do same ?

By: Maresa

Maresa — Thu, 23 Sep 2010 04:55:04 +0000

@Vishal: I’m trying to guess what you mean.

START TRANSACTION;
SELECT @myid := nextval(’sq_my_sequence’) as next_sequence;
INSERT INTO some_table (id, name) VALUES (@myid, ‘My Name’);
COMMIT;

By: Vishal

Vishal — Tue, 21 Sep 2010 16:07:02 +0000

Hi,

please advice.
if i have connection with auto commit false,
then this function when will commit the operation.

Thanks

By: Maresa

Maresa — Fri, 30 Apr 2010 07:47:57 +0000

@CaesarDraw Thank you. Mind letting me know what lines wasn’t working? I see one that I didn’t realize that somehow grater than ( > ) is being printed as >. It is fixed.

By: CesarDraw

CesarDraw — Sat, 24 Apr 2010 21:53:50 +0000

congrats! I corrected some lines that were causing errors and thus worked:

DELIMITER $$

DROP FUNCTION IF EXISTS `fac201001`.`nextval` $$
CREATE FUNCTION `sequence`.`nextval` (`seq_name` varchar(100)) RETURNS bigint(20) NOT DETERMINISTIC
BEGIN
DECLARE cur_val bigint(20);

SELECT
sequence_cur_value INTO cur_val
FROM
`sequence`.`sequence_data`
WHERE
sequence_name = seq_name;

IF cur_val IS NOT NULL THEN
UPDATE
`sequence`.`sequence_data`
SET
sequence_cur_value = IF (
(sequence_cur_value + sequence_increment) > sequence_max_value,
IF (
sequence_cycle = TRUE,
sequence_min_value,
NULL
),
sequence_cur_value + sequence_increment
)
WHERE
sequence_name = seq_name;
END IF;

RETURN cur_val;

END $$

DELIMITER ;