#
# MDEV-12457 Cursors with parameters
#
CREATE TABLE t1 (a INT, b VARCHAR(10)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'old'),(2,'old'),(3,'old'),(4,'old'),(5,'old');
CREATE PROCEDURE p1(min INT,max INT)
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE va INT;
DECLARE cur CURSOR(pmin INT, pmax INT) FOR SELECT a FROM t1 WHERE a BETWEEN pmin AND pmax;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN cur(min,max);
read_loop: LOOP
FETCH cur INTO va;
IF done THEN
LEAVE read_loop;
END IF;
INSERT INTO t1 VALUES (va,'new');
END LOOP;
CLOSE cur; 
END;
$$
CALL p1(2,4);
SELECT * FROM t1 ORDER BY b DESC,a;
a	b
1	old
2	old
3	old
4	old
5	old
2	new
3	new
4	new
DROP PROCEDURE p1;
DROP TABLE t1;
#
# OPEN with a wrong number of parameters
#
CREATE TABLE t1 (a INT, b VARCHAR(10));
CREATE PROCEDURE p1(a_a INT,a_b VARCHAR(32))
BEGIN
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_a INT, p_b VARCHAR(32)) FOR SELECT * FROM t1 WHERE a=p_a;
OPEN c(a_a);
CLOSE c;
END;
$$
ERROR 42000: Incorrect parameter count to cursor 'c'
DROP TABLE t1;
#
# Cursor parameters are not visible outside of the cursor
#
CREATE PROCEDURE p1(a_a INT)
BEGIN
DECLARE v_a INT;
DECLARE c CURSOR (p_a INT) FOR SELECT a FROM t1 WHERE a=p_a;
OPEN c(a_a);
SET p_a=10;
END;
$$
ERROR HY000: Unknown system variable 'p_a'
CREATE PROCEDURE p1(a_a INT)
BEGIN
DECLARE v_a INT;
DECLARE c CURSOR (p_a INT) FOR SELECT a FROM t1 WHERE a=p_a;
SET p_a= 10;
OPEN c(a_a);
END;
$$
ERROR HY000: Unknown system variable 'p_a'
#
# Cursor parameter shadowing a local variable
#
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
CREATE PROCEDURE p1(a INT)
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a INT DEFAULT NULL;
DECLARE p_a INT DEFAULT NULL;
DECLARE c CURSOR (p_a VARCHAR(32)) FOR SELECT p_a FROM t1;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c(a);
read_loop: LOOP
FETCH c INTO v_a;
IF done THEN
LEAVE read_loop;
END IF;
SELECT v_a;
END LOOP;
CLOSE c;
END;
$$
CALL p1(1);
v_a
1
CALL p1(NULL);
v_a
NULL
DROP PROCEDURE p1;
DROP TABLE t1;
#
# Parameters in SELECT list
#
CREATE PROCEDURE p1(a_a INT, a_b VARCHAR(32))
BEGIN
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_a INT, p_b VARCHAR(32)) FOR SELECT p_a,p_b FROM DUAL;
OPEN c(a_a + 0,a_b);
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
CLOSE c;
OPEN c(a_a + 1,a_b);
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
CLOSE c;
END;
$$
CALL p1(1,'b1');
v_a	v_b
1	b1
v_a	v_b
2	b1
DROP PROCEDURE p1;
#
# Parameters in SELECT list + UNION
#
CREATE PROCEDURE p1(a_a INT, a_b VARCHAR(32))
BEGIN
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR(p_a INT, p_b VARCHAR(32)) FOR
SELECT p_a,p_b FROM DUAL
UNION ALL
SELECT p_a+1,CONCAT(p_b,'b') FROM DUAL;
OPEN c(a_a,a_b);
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
CLOSE c;
END;
$$
CALL p1(1,'b1');
v_a	v_b
1	b1
v_a	v_b
2	b1b
DROP PROCEDURE p1;
#
# Parameters in SELECT list + type conversion + warnings
#
SET sql_mode='';
CREATE PROCEDURE p1(a_a VARCHAR(32))
BEGIN
DECLARE v_a INT;
DECLARE c CURSOR (p_a INT) FOR SELECT p_a FROM DUAL;
OPEN c(a_a);
FETCH c INTO v_a;
SELECT v_a;
CLOSE c;
END;
$$
CALL p1('1b');
v_a
1
Warnings:
Warning	1265	Data truncated for column 'p_a' at row 1
CALL p1('b1');
v_a
0
Warnings:
Warning	1366	Incorrect integer value: 'b1' for column ``.``.`p_a` at row 1
DROP PROCEDURE p1;
SET sql_mode=DEFAULT;
#
# One parameter in SELECT list + subselect
#
CREATE PROCEDURE p1(a_a VARCHAR(32))
BEGIN
DECLARE v_a VARCHAR(10);
DECLARE c CURSOR (p_a VARCHAR(32)) FOR
SELECT p_a FROM DUAL UNION SELECT REVERSE(p_a) FROM DUAL;
OPEN c((SELECT a_a));
FETCH c INTO v_a;
SELECT v_a;
FETCH c INTO v_a;
SELECT v_a;
CLOSE c;
END;
$$
CALL p1('ab');
v_a
ab
v_a
ba
DROP PROCEDURE p1;
#
# Two parameters in SELECT list + subselect
#
CREATE PROCEDURE p1()
BEGIN
DECLARE v_a VARCHAR(32);
DECLARE v_b VARCHAR(32);
DECLARE c CURSOR (p_a VARCHAR(32), p_b VARCHAR(32)) FOR
SELECT p_a, p_b FROM DUAL
UNION
SELECT p_b, p_a FROM DUAL;
OPEN c((SELECT 'aaa'),(SELECT 'bbb'));
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
FETCH c INTO v_a, v_b;
SELECT v_a, v_b;
CLOSE c;
END;
$$
CALL p1();
v_a	v_b
aaa	bbb
v_a	v_b
bbb	aaa
DROP PROCEDURE p1;
#
# Two parameters in SELECT list + two parameters in WHERE + subselects
#
CREATE PROCEDURE p1(a_a VARCHAR(32), a_b VARCHAR(32))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a VARCHAR(32);
DECLARE v_b VARCHAR(32);
DECLARE c CURSOR (value_a VARCHAR(32), value_b VARCHAR(32),
pattern_a VARCHAR(32), pattern_b VARCHAR(32)) FOR
SELECT value_a, value_b FROM DUAL WHERE value_a LIKE pattern_a
UNION
SELECT value_b, value_a FROM DUAL WHERE value_b LIKE pattern_b;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c((SELECT 'aaa'),(SELECT 'bbb'),(SELECT a_a),(SELECT a_b));
read_loop: LOOP
FETCH c INTO v_a, v_b;
IF done THEN
LEAVE read_loop;
END IF;
SELECT v_a, v_b;
END LOOP;
CLOSE c;
END;
$$
CALL p1('%','%');
v_a	v_b
aaa	bbb
v_a	v_b
bbb	aaa
CALL p1('aaa','xxx');
v_a	v_b
aaa	bbb
CALL p1('xxx','bbb');
v_a	v_b
bbb	aaa
CALL p1('xxx','xxx');
DROP PROCEDURE p1;
#
# Parameters in SELECT list + stored function
#
CREATE FUNCTION f1 (a VARCHAR(32)) RETURNS VARCHAR(32)
BEGIN
RETURN CONCAT(a,'y');
END;
$$
CREATE PROCEDURE p1(a_a VARCHAR(32))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a VARCHAR(10);
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_sel_a VARCHAR(32), p_cmp_a VARCHAR(32)) FOR
SELECT p_sel_a, p_cmp_a FROM DUAL;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c(f1(a_a), f1(a_a));
read_loop: LOOP
FETCH c INTO v_a, v_b;
IF done THEN
LEAVE read_loop;
END IF;
SELECT v_a, v_b;
END LOOP;
CLOSE c;
END;
$$
CALL p1('x');
v_a	v_b
xy	xy
CALL p1(f1(COALESCE(NULL, f1('x'))));
v_a	v_b
xyyy	xyyy
DROP PROCEDURE p1;
DROP FUNCTION f1;
#
# One parameter in WHERE clause
#
CREATE TABLE t1 (a INT, b VARCHAR(10));
CREATE TABLE t2 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES (1,'11');
INSERT INTO t1 VALUES (1,'12');
INSERT INTO t1 VALUES (2,'21');
INSERT INTO t1 VALUES (2,'22');
INSERT INTO t1 VALUES (3,'31');
INSERT INTO t1 VALUES (3,'32');
CREATE PROCEDURE p1(a_a INT)
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_a INT) FOR SELECT a,b FROM t1 WHERE a=p_a;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c(a_a);
read_loop: LOOP
FETCH c INTO v_a, v_b;
IF done THEN
LEAVE read_loop;
END IF;
INSERT INTO t2 VALUES (v_a,v_b);
END LOOP;
CLOSE c;
END;
$$
CALL p1(1);
SELECT * FROM t2;
a	b
1	11
1	12
DROP TABLE t1;
DROP TABLE t2;
DROP PROCEDURE p1;
#
# Two parameters in WHERE clause
#
CREATE TABLE t1 (a INT, b VARCHAR(10));
CREATE TABLE t2 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES (1,'11');
INSERT INTO t1 VALUES (1,'12');
INSERT INTO t1 VALUES (2,'21');
INSERT INTO t1 VALUES (2,'22');
INSERT INTO t1 VALUES (3,'31');
INSERT INTO t1 VALUES (3,'32');
CREATE PROCEDURE p1(a_a INT, a_b VARCHAR(32))
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_a INT, p_b VARCHAR(32)) FOR SELECT a,b FROM t1 WHERE a=p_a AND b=p_b;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c(a_a, a_b);
read_loop: LOOP
FETCH c INTO v_a, v_b;
IF done THEN
LEAVE read_loop;
END IF;
INSERT INTO t2 VALUES (v_a,v_b);
END LOOP;
CLOSE c;
END;
$$
CALL p1(1,'11');
SELECT * FROM t2;
a	b
1	11
DROP TABLE t1;
DROP TABLE t2;
DROP PROCEDURE p1;
#
# Parameters in WHERE and HAVING clauses
#
CREATE TABLE t1 (name VARCHAR(10), value INT);
INSERT INTO t1 VALUES ('but',1);
INSERT INTO t1 VALUES ('but',1);
INSERT INTO t1 VALUES ('but',1);
INSERT INTO t1 VALUES ('bin',1);
INSERT INTO t1 VALUES ('bin',1);
INSERT INTO t1 VALUES ('bot',1);
CREATE PROCEDURE p1 (arg_name_limit VARCHAR(32), arg_total_limit INT)
BEGIN
DECLARE i INT DEFAULT 0;
DECLARE v_name VARCHAR(10);
DECLARE v_total INT;
-- +0 is needed to work around the bug MDEV-11081
DECLARE c CURSOR(p_v INT) FOR
SELECT name, SUM(value + p_v) + 0 AS total FROM t1
WHERE name LIKE arg_name_limit
GROUP BY name HAVING total>=arg_total_limit;
WHILE i < 2 DO
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
OPEN c(i);
read_loop: LOOP
FETCH c INTO v_name, v_total;
IF done THEN
LEAVE read_loop;
END IF;
SELECT v_name, v_total;
END LOOP;
CLOSE c;
SET i= i + 1;
END;
END WHILE;
END;
$$
CALL p1('%', 2);
v_name	v_total
bin	2
v_name	v_total
but	3
v_name	v_total
bin	4
v_name	v_total
bot	2
v_name	v_total
but	6
CALL p1('b_t', 0);
v_name	v_total
bot	1
v_name	v_total
but	3
v_name	v_total
bot	2
v_name	v_total
but	6
DROP PROCEDURE p1;
DROP TABLE t1;
#
# One parameter in LIMIT clause
#
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES (1,'b1');
INSERT INTO t1 VALUES (2,'b2');
INSERT INTO t1 VALUES (3,'b3');
INSERT INTO t1 VALUES (4,'b4');
INSERT INTO t1 VALUES (5,'b5');
INSERT INTO t1 VALUES (6,'b6');
CREATE PROCEDURE p1(a_a INT)
BEGIN
DECLARE done INT DEFAULT 0;
DECLARE v_a INT;
DECLARE v_b VARCHAR(10);
DECLARE c CURSOR (p_a INT) FOR SELECT a,b FROM t1 ORDER BY a LIMIT p_a;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=TRUE;
CREATE TABLE t2 (a INT, b VARCHAR(10));
OPEN c(a_a);
read_loop: LOOP
FETCH c INTO v_a, v_b;
IF done THEN
LEAVE read_loop;
END IF;
INSERT INTO t2 VALUES (v_a,v_b);
END LOOP;
CLOSE c;
SELECT * FROM t2;
DROP TABLE t2;
END;
$$
CALL p1(1);
a	b
1	b1
CALL p1(3);
a	b
1	b1
2	b2
3	b3
CALL p1(6);
a	b
1	b1
2	b2
3	b3
4	b4
5	b5
6	b6
DROP TABLE t1;
DROP PROCEDURE p1;
#
# End of MDEV-12457 Cursors with parameters
#
#
# MDEV-14415 Add Oracle-style FOR loop to sql_mode=DEFAULT
#
# Explicit cursor
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES (1,'b1'), (2,'b2'), (3,'b3');
BEGIN NOT ATOMIC
DECLARE cur CURSOR FOR SELECT * FROM t1;
FOR rec IN cur
DO
SELECT rec.a AS a, rec.b AS b;
END FOR;
END;
$$
a	b
1	b1
a	b
2	b2
a	b
3	b3
DROP TABLE t1;
# Explicit cursor with parameters
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES (1,'b1'), (2,'b2'), (3,'b3');
BEGIN NOT ATOMIC
DECLARE cur CURSOR(pa INT) FOR SELECT * FROM t1 WHERE a>=pa;
FOR rec IN cur(2)
DO
SELECT rec.a AS a, rec.b AS b;
END FOR;
END;
$$
a	b
2	b2
a	b
3	b3
DROP TABLE t1;
# Explicit cursor + label
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES ('1','b1'), ('2','b2');
BEGIN NOT ATOMIC
DECLARE cur CURSOR FOR SELECT * FROM t1;
forrec:
FOR rec IN cur
DO
SELECT rec.a AS a, rec.b AS b;
IF rec.a = 2 THEN
LEAVE forrec;
END IF;
END FOR forrec;
END;
$$
a	b
1	b1
a	b
2	b2
DROP TABLE t1;
# Explicit cursor + FETCH inside the loop body produce an error on "NOT FOUND"
BEGIN NOT ATOMIC
DECLARE x INT;
DECLARE cur CURSOR FOR SELECT 1 AS x;
FOR rec IN cur
DO
FETCH cur INTO x;
END FOR;
END;
$$
ERROR 02000: No data - zero rows fetched, selected, or processed
# Explicit cursor + FETCH inside the loop body are normally handled by "HANDLER FOR NOT FOUND"
BEGIN NOT ATOMIC
DECLARE done INT DEFAULT 0;
DECLARE cur CURSOR FOR SELECT 1 AS x, 'y1' AS y UNION
SELECT 2,'y2' UNION
SELECT 3,'y3';
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
forrec:
FOR rec IN cur
DO
SELECT CONCAT(rec.x, ' ', rec.y) AS 'Implicit FETCH';
FETCH cur INTO rec;
IF done THEN
SELECT 'NO DATA' AS `Explicit FETCH`;
LEAVE forrec;
ELSE
SELECT CONCAT(rec.x, ' ', rec.y) AS 'Explicit FETCH';
END IF;
END FOR;
END;
$$
Implicit FETCH
1 y1
Explicit FETCH
2 y2
Implicit FETCH
3 y3
Explicit FETCH
NO DATA
# Implicit cursor
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES ('1','b1'), ('2','b2');
BEGIN NOT ATOMIC
FOR rec IN (SELECT * FROM t1)
DO
SELECT rec.a AS a, rec.b AS b;
END FOR;
END;
$$
a	b
1	b1
a	b
2	b2
DROP TABLE t1;
# Implicit cursor + label
CREATE TABLE t1 (a INT, b VARCHAR(10));
INSERT INTO t1 VALUES ('1','b1'), ('2','b2');
BEGIN NOT ATOMIC
forrec:
FOR rec IN (SELECT * FROM t1)
DO
SELECT rec.a AS a, rec.b AS b;
IF rec.a = 2 THEN
LEAVE forrec;
END IF;
END FOR;
END;
$$
a	b
1	b1
a	b
2	b2
DROP TABLE t1;
#
# MDEV-15941 Explicit cursor FOR loop does not close the cursor
#
BEGIN NOT ATOMIC
DECLARE v INT;
DECLARE cur CURSOR FOR SELECT 1 AS a FROM DUAL;
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
FETCH cur INTO v;
END;
$$
rec.a
1
ERROR 24000: Cursor is not open
BEGIN NOT ATOMIC
DECLARE v INT;
DECLARE cur CURSOR FOR SELECT 1 AS a FROM DUAL;
label:
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
FETCH cur INTO v;
END;
$$
rec.a
1
ERROR 24000: Cursor is not open
BEGIN NOT ATOMIC
DECLARE cur CURSOR FOR SELECT 1 AS a FROM DUAL;
OPEN cur;
FOR rec IN cur DO
SELECT rec.a;
END FOR;
END;
$$
ERROR 24000: Cursor is already open
BEGIN NOT ATOMIC
DECLARE cur CURSOR FOR SELECT 1 AS a FROM DUAL;
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
END;
$$
rec.a
1
rec.a
1
BEGIN NOT ATOMIC
DECLARE cur CURSOR FOR SELECT 1 AS a FROM DUAL;
label1:
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
label2:
FOR rec IN cur
DO
SELECT rec.a;
END FOR;
END;
$$
rec.a
1
rec.a
1
#
# MDEV-16584 SP with a cursor inside a loop wastes THD memory aggressively
#
CREATE PROCEDURE p1()
BEGIN
DECLARE mem_used_old BIGINT UNSIGNED DEFAULT
(SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_STATUS
WHERE VARIABLE_NAME='MEMORY_USED');
DECLARE i INT DEFAULT 1;
WHILE i <= 5000
DO
BEGIN
DECLARE msg TEXT;
DECLARE mem_used_cur BIGINT UNSIGNED DEFAULT
(SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_STATUS
WHERE VARIABLE_NAME='MEMORY_USED');
DECLARE cur CURSOR FOR SELECT 1 FROM DUAL;
IF (mem_used_cur >= mem_used_old * 2) THEN
SHOW STATUS LIKE 'Memory_used';
SET msg=CONCAT('Memory leak detected: i=', i, ' mem_used_old=',mem_used_old,' mem_used_cur=', mem_used_cur);
SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT=msg;
END IF;
END;
SET i=i+1;
END WHILE;
END;
$$
CALL p1;
DROP PROCEDURE p1;
#
# MDEV-17278 CURSOR FOR LOOP - ERROR: unexpected end of stream, read 0 bytes (SERVER CRASH)
#
CREATE TABLE t1 (id2 int, id int, en1 enum('aaa','a','b','c'));
INSERT INTO t1 VALUES(1,1,'aaa'),(2,2,'a'),(3,3,'b'),(4,4,'c');
CREATE PROCEDURE p1()
BEGIN
FOR rec IN (SELECT en1 FROM t1)
DO
SELECT rec.en1;
END FOR;
END;
$$
CALL p1();
rec.en1
aaa
rec.en1
a
rec.en1
b
rec.en1
c
DROP PROCEDURE p1;
DROP TABLE t1;