salix/db/routines/vn/functions/testNIF.sql

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DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` FUNCTION `vn`.`testNIF`(vNIF VARCHAR(9))
RETURNS tinyint(1)
DETERMINISTIC
BEGIN
DECLARE vIndice INT;
DECLARE vParteNumerica DECIMAL(8,0);
DECLARE vLetra VARCHAR(1);
DECLARE vLetrasPosibles VARCHAR(24) DEFAULT "TRWAGMYFPDXBNJZSQVHLCKE";
SET vLetra = SUBSTRING(vNIF, 9, 1);
SET vParteNumerica = CAST(SUBSTRING(vNIF, 1, 8) AS DECIMAL(8,0));
SET vIndice = Round(vParteNumerica MOD 23, 0) + 1;
If SUBSTRING(vLetrasPosibles, vIndice, 1) = vLetra Then
RETURN TRUE;
ELSE
RETURN FALSE;
END IF;
END$$
DELIMITER ;