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| --------------
SET AUTOCOMMIT = 0
--------------
--------------
START TRANSACTION
--------------
--------------
DROP DATABASE IF EXISTS `base`
--------------
--------------
CREATE DATABASE `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
--------------
--------------
DROP TABLE IF EXISTS `block`
--------------
--------------
CREATE TABLE IF NOT EXISTS `block`
( `id` integer unsigned not null auto_increment primary key,
`lib` varchar(255) not null
) engine=innoDB
default charset=latin1 collate=latin1_general_ci
row_format=compressed
--------------
--------------
insert into `block` (`lib`) values ('un'),('deux')
--------------
--------------
select * from `block`
--------------
+----+------+
| id | lib |
+----+------+
| 1 | un |
| 2 | deux |
+----+------+
--------------
DROP TABLE IF EXISTS `blade`
--------------
--------------
CREATE TABLE IF NOT EXISTS `blade`
( `id` integer unsigned not null auto_increment primary key,
`lib` varchar(255) not null
) engine=innoDB
default charset=latin1 collate=latin1_general_ci
row_format=compressed
--------------
--------------
insert into `blade` (`lib`) values ('one'),('two')
--------------
--------------
select * from `blade`
--------------
+----+-----+
| id | lib |
+----+-----+
| 1 | one |
| 2 | two |
+----+-----+
--------------
DROP TABLE IF EXISTS `pci`
--------------
--------------
CREATE TABLE IF NOT EXISTS `pci`
( `id` integer unsigned not null auto_increment primary key,
`id_block` integer unsigned null,
`id_blade` integer unsigned null,
`lib` varchar(255) not null,
CONSTRAINT `FK_BLOCK` FOREIGN KEY (`id_block`) REFERENCES `block` (`id`) ON DELETE RESTRICT ON UPDATE CASCADE,
CONSTRAINT `FK_BLADE` FOREIGN KEY (`id_blade`) REFERENCES `blade` (`id`) ON DELETE RESTRICT ON UPDATE CASCADE
) engine=innoDB
default charset=latin1 collate=latin1_general_ci
row_format=compressed
--------------
--------------
DROP TRIGGER IF EXISTS `verify`
--------------
--------------
CREATE TRIGGER `verify`
BEFORE INSERT ON `pci`
FOR EACH ROW
BEGIN
DECLARE _msg varchar(255);
IF (new.id_block = new.id_blade) then
set _msg = concat('Même valeur, insertion interdite !');
SIGNAL SQLSTATE VALUE '07777' SET MESSAGE_TEXT = _msg, MYSQL_ERRNO = 7777;
END IF;
IF ((new.id_block is not null) and (new.id_blade is not null)) then
set _msg = concat('C''est l''une ou l''autre mais pas les deux colonnes à la fois !');
SIGNAL SQLSTATE VALUE '07777' SET MESSAGE_TEXT = _msg, MYSQL_ERRNO = 7777;
END IF;
IF ((new.id_block is null) and (new.id_blade is null)) then
set _msg = concat('Vous devez renseigner au moins l''une des deux colonnes !');
SIGNAL SQLSTATE VALUE '07777' SET MESSAGE_TEXT = _msg, MYSQL_ERRNO = 7777;
END IF;
END
--------------
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insert into `pci` (`id_block`,`id_blade`,`lib`) values ( 1, null, 'nombre 1 en français')
--------------
--------------
insert into `pci` (`id_block`,`id_blade`,`lib`) values (null, 2, 'nombre 2 en anglais')
--------------
--------------
insert into `pci` (`id_block`,`id_blade`,`lib`) values (null, null, 'nombre 1 en français')
--------------
ERROR 7777 (07777) at line 119: Vous devez renseigner au moins l'une des deux colonnes !
--------------
insert into `pci` (`id_block`,`id_blade`,`lib`) values ( 1, 1, 'nombre 1 en français')
--------------
ERROR 7777 (07777) at line 120: Même valeur, insertion interdite !
--------------
insert into `pci` (`id_block`,`id_blade`,`lib`) values ( 2, 2, 'nombre 2 en anglais')
--------------
ERROR 7777 (07777) at line 121: Même valeur, insertion interdite !
--------------
insert into `pci` (`id_block`,`id_blade`,`lib`) values ( 1, 2, 'nombre 2 en anglais')
--------------
ERROR 7777 (07777) at line 122: C'est l'une ou l'autre mais pas les deux colonnes à la fois !
--------------
select * from `pci`
--------------
+----+----------+----------+----------------------+
| id | id_block | id_blade | lib |
+----+----------+----------+----------------------+
| 1 | 1 | NULL | nombre 1 en français |
| 2 | NULL | 2 | nombre 2 en anglais |
+----+----------+----------+----------------------+
--------------
select t1.id,
t1.lib,
t2.lib,
t3.lib
from pci as t1
left outer join block as t2
on t2.id = t1.id_block
left outer join blade as t3
on t3.id = t1.id_blade
--------------
+----+----------------------+------+------+
| id | lib | lib | lib |
+----+----------------------+------+------+
| 1 | nombre 1 en français | un | NULL |
| 2 | nombre 2 en anglais | NULL | two |
+----+----------------------+------+------+
--------------
COMMIT
--------------
--------------
SET AUTOCOMMIT = 1
--------------
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