mirror of
https://github.com/MariaDB/server.git
synced 2025-01-16 20:12:31 +01:00
739 lines
14 KiB
Text
739 lines
14 KiB
Text
#
|
|
# 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;
|