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how to declare cursor in middle of stored procedure
Posted by: BHANU PRATAP MUNAGALA
Date: October 19, 2016 03:36AM

Hi

I am trying to DECLARE cursor based in middle of the stored procedure and getting the below error.

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DECLARE fc
st_cur CURSOR FOR SELECT t,used_size from fcst;
DECLARE CONTINUE HANDL' at line 91

Enclosing is the PL/SQL Code.

CREATE PROCEDURE get_avg_lm_data3(IN p_start_date date, IN p_end_date date, IN p_db_name VARCHAR(50))
BEGIN
DECLARE v_sw INT;
DECLARE v_ew INT;
DECLARE v_sy INT;
DECLARE v_ey INT;
DECLARE v_wcnt INT;
DECLARE v_rcnt INT;
DECLARE v_dbcnt INT;
DECLARE i1 INT;
DECLARE i2 INT;
DECLARE i3 INT;
DECLARE str1 varchar(255);
DECLARE str2 varchar(255);
DECLARE str3 decimal(10,5);
DECLARE v_mxwk INT;

DECLARE val_wno INT;
DECLARE val_usg DECIMAL(10,5);
DECLARE n INT;
DECLARE slope DECIMAL(10,5);
DECLARE intercept DECIMAL(10,5);
DECLARE meanT DECIMAL(10,5);
DECLARE meanY DECIMAL(10,5);
DECLARE st22 DECIMAL(10,5);
DECLARE st2 DECIMAL(10,5);
DECLARE st DECIMAL(10,5);
DECLARE sY DECIMAL(10,5);
DECLARE stY DECIMAL(10,5);
DECLARE Y DECIMAL (10,5);
DECLARE loop_cntr1 INT;
DECLARE nmax INT;

DECLARE no_more_rows BOOLEAN;
DECLARE loop_cntr INT DEFAULT 0;
DECLARE num_rows INT DEFAULT 0;


SELECT WEEK(p_start_date) INTO v_sw from dual;
SELECT WEEK(p_end_date) INTO v_ew from dual;
SELECT year(p_start_date) INTO v_sy from dual;
SELECT year(p_end_date) INTO v_ey from dual;
SELECT MAX(AVGWEEK) INTO v_mxwk FROM WEEKLY_DB_SIZE;

SELECT count(*) into v_dbcnt from weekly_db_size where database_name = p_db_name;

if(v_dbcnt = 0) then
SIGNAL SQLSTATE '45000'
SET MESSAGE_TEXT = 'ERROR !!! NO DATABASE FOUND BY NAME';
end if;

SELECT COMPUTE_WEEKS(p_start_date,p_end_date) into v_wcnt from dual;

if(v_wcnt < 0) then
SIGNAL SQLSTATE '45000'
SET MESSAGE_TEXT = 'ERROR !!! WRONG DATES CHOOSEN AS INPUTS';
end if;


SELECT COUNT(*) INTO v_rcnt from weekly_db_size where avgweek between v_sw and v_ew and database_name = p_db_name and avgyear between v_sy and v_ey;

if(v_rcnt = 0) then
SIGNAL SQLSTATE '45000'
SET MESSAGE_TEXT ='ERROR !!! NO DATA PRESENT IN THE SELECTED TIME INTERVAL';
end if;

DROP TABLE FCST;
CREATE TABLE FCST(t int,wno int, used_size decimal(10,5),tY decimal(10,5), t2 int(11),projected varchar(5));

SET i1 = 1;
SET i2 = v_sw;


LOOP_LABEL : LOOP
IF i1 > v_wcnt THEN
LEAVE LOOP_LABEL;
END IF;

SET str3 = (SELECT IFNULL(sum(USED_GB),0) FROM WEEKLY_DB_SIZE WHERE AVGWEEK = i2);
INSERT INTO FCST VALUES(i1,i2,str3,0,0,'N');
SET i1 = i1 + 1;
SET i2 = i2 + 1;
IF i2 = v_mxwk THEN
SET i1 = v_wcnt;
END IF;
ITERATE LOOP_LABEL;
END LOOP;

SELECT * FROM FCST;

DECLARE fcst_cur CURSOR FOR SELECT t,used_size from fcst;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_rows = TRUE;

OPEN fcst_cur;
SELECT FOUND_ROWS() INTO n;

the_loop: LOOP

FETCH fcst_cur INTO val_wno, val_usg;

IF no_more_rows THEN
CLOSE fcst_cur;
LEAVE the_loop;
END IF;

UPDATE fcst SET tY = (val_wno * val_usg) , t2 = (power(val_wno,2)) WHERE t = val_wno;

SELECT val_wno, val_usg;

SET loop_cntr = loop_cntr + 1;

END LOOP the_loop;

select num_rows, loop_cntr;

select * from fcst1;

-- Compute varailbles required Slope and Intercept calcuclation

SELECT SUM(tY) INTO stY from fcst1;
SELECT SUM(used_size) INTO sY from fcst1;
SELECT SUM(t) INTO st from fcst1;
SELECT SUM(t2) INTO st2 from fcst1;
SELECT POWER(SUM(t),2) INTO st22 from fcst1;
SELECT AVG(t) INTO meanT from fcst1;
SELECT AVG(used_size) into meanY from fcst1;

-- Compute Slope

SELECT (n*sty - st*sY)/(n*st2 - st22) INTO slope;

-- Compute Intercept

SELECT (meanY - slope*meanT) INTO intercept;

SELECT slope,intercept;

-- Computes forecast or predictes next 4 weeks future values

SET loop_cntr1 = loop_cntr + 1;
SET i3 = i2 + 1;

SELECT (n+4) INTO nmax;

SELECT nmax;

fcst_loop : LOOP
IF loop_cntr1 > nmax THEN
LEAVE fcst_loop;
END IF;

SELECT ( intercept + (slope*loop_cntr1)) INTO Y;

INSERT INTO FCST1 VALUES (loop_cntr1,i3,Y,0,0,'Y');
SET loop_cntr1 = loop_cntr1 + 1;
SET i3 = i3 + 1;
ITERATE fcst_loop;
END LOOP;

SELECT * FROM FCST;


END //

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how to declare cursor in middle of stored procedure
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