1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
| --------------
SET AUTOCOMMIT = 0
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--------------
START TRANSACTION
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DROP DATABASE IF EXISTS `essai`
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CREATE DATABASE `essai`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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COMMIT
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DROP TABLE IF EXISTS `test`
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CREATE TABLE test (
id INT unsigned NOT NULL AUTO_INCREMENT,
next INT unsigned default NULL,
PRIMARY KEY(ID)
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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DROP PROCEDURE IF EXISTS `test`
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CREATE PROCEDURE `test`(_i int)
BEGIN
DECLARE _fin INTEGER DEFAULT 1;
DECLARE _z INTEGER DEFAULT 0;
DECLARE _tab CURSOR FOR SELECT id FROM test WHERE next = _i;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET _fin = 0;
OPEN _tab;
FETCH _tab INTO _z;
WHILE (_fin)
DO
DELETE FROM test WHERE id = _z;
CALL test(_z);
FETCH _tab INTO _z;
END WHILE;
CLOSE _tab;
DELETE FROM test WHERE id = _i;
END
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COMMIT
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INSERT INTO test (`id`,`next`) VALUES
(1,6),(2,4),(3,7),(4,NULL),(5,8),(6,9),(7,9),(8,NULL),(9,NULL)
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select * from test
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+----+------+
| id | next |
+----+------+
| 1 | 6 |
| 2 | 4 |
| 3 | 7 |
| 4 | NULL |
| 5 | 8 |
| 6 | 9 |
| 7 | 9 |
| 8 | NULL |
| 9 | NULL |
+----+------+
--------------
call test(9)
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select *
from test
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+----+------+
| id | next |
+----+------+
| 2 | 4 |
| 4 | NULL |
| 5 | 8 |
| 8 | NULL |
+----+------+
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COMMIT
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SET AUTOCOMMIT = 1
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