Clear handler before function return value to procedure mysql - mysql

Question

I have the mysql version 5.5.38.
When I call a procedure that call a function inside there, handler condition its activated into function and raise up to procedure. I need that handler condition on function not affect the process on procedure. Included the function and procedure.
function:
DELIMITER $$
CREATE FUNCTION FUNCTION_HOURLY_GAS_CHANGE(INI_DATE DATETIME, TANK INT)
RETURNS INT
NOT DETERMINISTIC
BEGIN
DECLARE END_GAL INT;
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET END_GAL = -1;
SET END_GAL = 0;
SELECT GALLONS INTO END_GAL
FROM TLS_TEMP_DATA WHERE FK_TANK = TANK
AND DATE LIKE CONCAT(DATE_FORMAT(DATE_ADD(DATE_FORMAT(INI_DATE, '%Y-%m-%d %H'), INTERVAL 1 HOUR), '%Y-%m-%d %H'),':%')
AND REQUEST_TYPE = 1;
RETURN END_GAL;
END $$
DELIMITER ;
procedure:
DELIMITER $$
CREATE PROCEDURE HOURLY_GAS_CHANGE(IN dateReport char(50), IN tank INT)
BEGIN
DECLARE COMPLETELOOP INT DEFAULT 0;
DECLARE INI_DATE DATETIME;
DECLARE INI_GAL INT;
DECLARE END_GAL INT;
DECLARE DIFF INT;
DECLARE V_HOUR CHAR(50);
DECLARE V_INI_GAL CHAR(50);
DECLARE V_END_GAL CHAR(50);
DECLARE V_DIFF CHAR(50);
DECLARE INITIALDATA CURSOR FOR
SELECT
DATE, GALLONS FROM TLS_TEMP_DATA WHERE FK_TANK = tank
AND (DATE BETWEEN CONCAT(dateReport, ' 00:00:00') AND CONCAT(dateReport, ' 23:59:59')) AND REQUEST_TYPE = 1
ORDER BY ID;
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET COMPLETELOOP = 1;
DROP TEMPORARY TABLE IF EXISTS HOURLYGASCHANGE;
CREATE TEMPORARY TABLE HOURLYGASCHANGE(
`HOUR_DATA` CHAR(50) NOT NULL,
`INI_GAL` CHAR(50) NOT NULL,
`END_GAL` CHAR(50) NOT NULL,
`DIFF` CHAR(50) NOT NULL)
ENGINE=MEMORY;
OPEN INITIALDATA;
READ_LOOP: LOOP
FETCH INITIALDATA INTO INI_DATE, INI_GAL;
IF COMPLETELOOP THEN
LEAVE READ_LOOP;
END IF;
SET END_GAL = 1;
SET END_GAL = FUNCTION_HOURLY_GAS_CHANGE(INI_DATE, tank);
IF END_GAL > 0 THEN
SET DIFF = (END_GAL - INI_GAL);
SET V_DIFF = CAST(DIFF AS CHAR(50));
SET V_END_GAL = CAST(END_GAL AS CHAR(50));
ELSE
SET V_DIFF = 'N/A';
SET V_END_GAL = 'NOT UPDATED';
END IF;
SET V_INI_GAL = CAST(INI_GAL AS CHAR(50));
SET V_HOUR = CAST(DATE_FORMAT(INI_DATE, '%H') AS CHAR(50));
INSERT INTO HOURLYGASCHANGE VALUES(V_HOUR, V_INI_GAL, V_END_GAL, V_DIFF);
END LOOP;
close INITIALDATA;
SELECT * FROM HOURLYGASCHANGE;
END $$
DELIMITER ;

Answer 1

I can't fix the problem, but I found a solution to replace the function, I capture empty result into IFNULL function and now I can set a specific value when select show me a empty result.
SELECT (
IFNULL(
(
SELECT ENDTLS.GALLONS
FROM TLS_TEMP_DATA ENDTLS
WHERE ENDTLS.FK_TANK = tank
AND ENDTLS.DATE LIKE ONCAT(DATE_FORMAT(DATE_ADD(DATE_FORMAT(INI_DATE, '%Y-%m-%d %H'), INTERVAL 1 HOUR), '%Y-%m-%d %H'),':%')
AND ENDTLS.REQUEST_TYPE = 1
)
, -1)
) INTO END_GAL;