MySQL Procedure won't do anything - mysql

Question

This stored procedure should insert an entry after a SELECT for a foreign key. Currently, It does nothing. When I CALL it, it won't give me an error or anything and won't insert the record either.
Can I even do multiple things (SELECT, UPDATE, INSERT..) in a single procedure? If yes, what am I missing here? If there is an error while running one of the (update/insert/select)s, should I get an error?
DELIMITER $$
CREATE PROCEDURE `InserAndAttachReferencia` (
IN refereciaText VARCHAR(45),
IN attachTo INT unsigned,
OUT insid INT unsigned
)
BEGIN
-- SELECT THE REP_ID
DECLARE attachToRepID INT UNSIGNED DEFAULT 0;
SELECT id
INTO attachToRepID
FROM AlkReferencia
WHERE id=attachTo;
-- INSERTING THE NEW ENTRY WITH GIVEN REP_ID
INSERT INTO AlkReferencia (id,rep_id,csatolva_id,referencia)
VALUES(null,attachToRepID,attachTo,referenciaText);
SET insid = LAST_INSERT_ID();
END
Edit.:
Yeah, the last update is useless here, should just set the rep_id while inserting, but it is not the issue here. (Copied from one of my other procedure, when I need the last update...)..Fixed in the question.
Table:
-- -----------------------------------------------------
-- Table `AlkatreszDb`.`AlkReferencia`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `AlkatreszDb`.`AlkReferencia` ;
CREATE TABLE IF NOT EXISTS `AlkatreszDb`.`AlkReferencia` (
`id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
`rep_id` INT UNSIGNED NULL,
`csatolva_id` INT UNSIGNED NULL,
`referencia` VARCHAR(45) NOT NULL,
`created_at` TIMESTAMP NULL DEFAULT CURRENT_TIMESTAMP,
`updated_at` TIMESTAMP NULL,
PRIMARY KEY (`id`),
INDEX `fk_AlkReferencia_AlkReferencia1_idx` (`rep_id` ASC),
INDEX `fk_AlkReferencia_AlkReferencia2_idx` (`csatolva_id` ASC),
CONSTRAINT `fk_AlkReferencia_AlkReferencia1`
FOREIGN KEY (`rep_id`)
REFERENCES `AlkatreszDb`.`AlkReferencia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION,
CONSTRAINT `fk_AlkReferencia_AlkReferencia2`
FOREIGN KEY (`csatolva_id`)
REFERENCES `AlkatreszDb`.`AlkReferencia` (`id`)
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;

Answer 1

This is unlikely to fix your problem, but you can simplify the code to:
INSERT INTO AlkReferencia(rep_id, csatolva_id, referencia)
SELECT ar.id, attachTo, referenciaText
FROM AlkReferencia ar
WHERE ar.id = attachTo;
I would also prepend the variable names with v_ (or something) to distinguish them from column names. That is often a source of errors in stored procedures:
INSERT INTO AlkReferencia(rep_id, csatolva_id, referencia)
SELECT ar.id, v_attachTo, v_referenciaText
FROM AlkReferencia ar
WHERE ar.id = v_attachTo;
EDIT:
This code is quite suspicious:
SELECT id
INTO attachToRepID
FROM AlkReferencia
WHERE id = attachTo;
Why not just use attachTo? Do you intend for one of the references to really be csatolva_id?

Answer 2

You say that your code is outputting nothing. Have you tried EXEC the procedure with parameters?