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
| --------------
SET AUTOCOMMIT = 0
--------------
--------------
START TRANSACTION
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
--------------
--------------
DROP TABLE IF EXISTS `pere`
--------------
--------------
CREATE TABLE `pere`
(
`clef` INT UNSIGNED NOT NULL PRIMARY KEY,
`nombre` char(20) NULL DEFAULT NULL
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `pere` (`clef`,`nombre`) values (1, 'un')
--------------
--------------
DROP TABLE IF EXISTS `fils`
--------------
--------------
CREATE TABLE `fils`
(
`clef` INT UNSIGNED NOT NULL PRIMARY KEY,
`number` char(20) NULL DEFAULT NULL,
FOREIGN KEY (`clef`)
REFERENCES `pere` (`clef`)
ON UPDATE CASCADE
ON DELETE CASCADE
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
--------------
--------------
insert into `fils` (`clef`,`number`) values (1, 'one')
--------------
--------------
DROP TRIGGER IF EXISTS `ajout`
--------------
--------------
CREATE TRIGGER `ajout`
BEFORE INSERT ON `fils`
FOR EACH ROW BEGIN
if not exists (select 1 from pere where clef=new.clef) then
insert into pere (clef, nombre) value (new.clef, null);
end if;
END
--------------
--------------
insert into `fils` (`clef`, `number`) values (2, 'two')
--------------
--------------
select * from `pere`
--------------
+------+--------+
| clef | nombre |
+------+--------+
| 1 | un |
| 2 | NULL |
+------+--------+
--------------
select * from `fils`
--------------
+------+--------+
| clef | number |
+------+--------+
| 1 | one |
| 2 | two |
+------+--------+
--------------
COMMIT
--------------
--------------
SET AUTOCOMMIT = 1
--------------
Appuyez sur une touche pour continuer... |
Partager