Probleme avec retour de procedure

**Marc_3** · 23/03/2016, 11h36

Bonjour,

Je fais une procedure stockée avec mysql et je ne peux utiliser les if else à l'intérieur.
J'utilise la procedure depuis un programme extérieur.

L'idée est pour moi de récuperer le id d'un Tuple si celui-ci existe sinon -1.

Est-ce que quelqu'un peut m'aider pour la syntaxe??
NB Sans le if else la procedure marche tres bien

Voici la procedure :

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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DROP PROCEDURE IF EXISTS is_leg_id_in_database;
DELIMITER $$                                                      
CREATE PROCEDURE is_leg_id_in_database (IN given_airline_cd VARCHAR(3),
									   IN given_flight_nr INT,
									   IN given_arp_dep varchar(3),
									   IN given_arp_arr varchar(3), 
									   IN given_time_dep int, 
									   IN given_time_arr INT,
									   IN given_op_airline_cd VARCHAR(3),
									   IN given_leg_sequence_nr INT,
									  OUT id_leg INT)  
 
BEGIN
   DECLARE tmp_var INT;
    SELECT TW_LEG_ID as tmp_var 
	 from TW_LEG 
	 where     AIRLINE_CD    = given_airline_cd 
	       and FLIGHT_NUMBER = given_flight_nr
	       and DEP_ARP_CD    = given_arp_dep
	       and ARR_ARP_CD    = given_arp_arr
	 		 and S_TIME_DEP    = given_time_dep
			 and S_TIME_ARR    = given_time_arr
			 and OP_AIRLINE_CD = given_op_airline_cd
			 and given_leg_sequence_nr = given_leg_sequence_nr; 
 
//************** Ici ce qui ne marche pas
	IF (tmp_var > 0)
	then SET id_leg = tmp_var;	   
	else SET id_leg = -1;	
	END IF;
//******************
 
 
END $$
 
DELIMITER ;

Merci d'avance

marc_3

**escartefigue** · 23/03/2016, 11h54

bonjour,

Vous pouvez simplifier ainsi :

Code :

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SELECT case
when exists
    (select 1
     from TW_LEG
     where AIRLINE_CD    = given_airline_cd 
       and FLIGHT_NUMBER = given_flight_nr
       and DEP_ARP_CD    = given_arp_dep
       and ARR_ARP_CD    = given_arp_arr
       and S_TIME_DEP    = given_time_dep
       and S_TIME_ARR    = given_time_arr
       and OP_AIRLINE_CD = given_op_airline_cd
       and given_leg_sequence_nr = given_leg_sequence_nr)
     then TW_LEG_ID
     else -1
     end as tmp_var

**Marc_3** · 23/03/2016, 12h44

Merci pour la réponse,
oui en fait c'est bien plus simple ainsi

**Artemus24** · 23/03/2016, 15h16

Salut Marc_3.

Voici ta procédure stockée sous deux écritures différentes, l'une avec un "if" et l'autre avec la fonction "ifnull".

Code :

Sélectionner tout - Visualiser dans une fenêtre à part

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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 `tw_leg`
--------------
 
--------------
CREATE TABLE `tw_leg`
( `tw_leg_id`        integer unsigned  NOT NULL AUTO_INCREMENT primary key,
  `airline_cd`       char(03)          NOT NULL,
  `flight_number`    integer           NOT NULL,
  `dep_arp_cd`       char(03)          NOT NULL,
  `arr_arp_cd`       char(03)          NOT NULL,
  `s_time_dep`       time              NOT NULL,
  `s_time_arr`       time              NOT NULL,
  `op_airline_cd`    char(03)          NOT NULL,
  `leg_sequence_nr`  integer           NOT NULL
) ENGINE=InnoDB
  DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
  ROW_FORMAT=COMPRESSED
--------------
 
--------------
DROP PROCEDURE IF EXISTS `is_leg_id_in_database_1`
--------------
 
--------------
CREATE PROCEDURE `is_leg_id_in_database_1` (
  IN  given_airline_cd       char(3),
  IN  given_flight_nr        integer,
  IN  given_arp_dep          char(3),
  IN  given_arp_arr          char(3),
  IN  given_time_dep         time,
  IN  given_time_arr         time,
  IN  given_op_airline_cd    CHAR(3),
  IN  given_leg_sequence_nr  integer,
  OUT id_leg                 integer
)
DETERMINISTIC
NO SQL
BEGIN
  DECLARE tmp_var integer default null;
 
  SELECT TW_LEG_ID into tmp_var
  FROM   TW_LEG
  WHERE  AIRLINE_CD      = given_airline_cd
    AND  FLIGHT_NUMBER   = given_flight_nr
    AND  DEP_ARP_CD      = given_arp_dep
    AND  ARR_ARP_CD      = given_arp_arr
    AND  S_TIME_DEP      = given_time_dep
    AND  S_TIME_ARR      = given_time_arr
    AND  OP_AIRLINE_CD   = given_op_airline_cd
    AND  leg_sequence_nr = given_leg_sequence_nr;
 
  IF (tmp_var > 0) then
       SET id_leg = tmp_var;
  ELSE SET id_leg = -1;
  END IF;
END
--------------
 
--------------
DROP PROCEDURE IF EXISTS `is_leg_id_in_database_2`
--------------
 
--------------
CREATE PROCEDURE `is_leg_id_in_database_2` (
  IN  given_airline_cd       char(3),
  IN  given_flight_nr        integer,
  IN  given_arp_dep          char(3),
  IN  given_arp_arr          char(3),
  IN  given_time_dep         time,
  IN  given_time_arr         time,
  IN  given_op_airline_cd    CHAR(3),
  IN  given_leg_sequence_nr  integer,
  OUT id_leg                 integer
)
DETERMINISTIC
NO SQL
BEGIN
SELECT IFNULL ((
  SELECT   TW_LEG_id
    FROM   TW_LEG
   WHERE   AIRLINE_CD    = given_airline_cd
     and   FLIGHT_NUMBER = given_flight_nr
     and   DEP_ARP_CD    = given_arp_dep
     and   ARR_ARP_CD    = given_arp_arr
     and   S_TIME_DEP    = given_time_dep
     and   S_TIME_ARR    = given_time_arr
     and   OP_AIRLINE_CD = given_op_airline_cd
     and   leg_sequence_nr = given_leg_sequence_nr
), -1) into id_leg;
END
--------------
 
--------------
INSERT INTO `tw_leg` (`tw_leg_id`,`airline_cd`,`flight_number`,`dep_arp_cd`,`arr_arp_cd`,`s_time_dep`,`s_time_arr`,`op_airline_cd`,`leg_sequence_nr`) VALUES
  (17,'xxx', 235, 'yyy', 'zzz', '15:00:00', '17:25:00', 'ttt', 5)
--------------
 
--------------
select * from tw_leg
--------------
 
+-----------+------------+---------------+------------+------------+------------+------------+---------------+-----------------+
| tw_leg_id | airline_cd | flight_number | dep_arp_cd | arr_arp_cd | s_time_dep | s_time_arr | op_airline_cd | leg_sequence_nr |
+-----------+------------+---------------+------------+------------+------------+------------+---------------+-----------------+
|        17 | xxx        |           235 | yyy        | zzz        | 15:00:00   | 17:25:00   | ttt           |               5 |
+-----------+------------+---------------+------------+------------+------------+------------+---------------+-----------------+
--------------
set @toto = null
--------------
 
--------------
call `is_leg_id_in_database_1` ('xxx', 235, 'yyy', 'zzz', '15:00:00', '17:25:00', 'ttt', 5, @toto)
--------------
 
--------------
select @toto
--------------
 
+-------+
| @toto |
+-------+
|    17 |
+-------+
--------------
call `is_leg_id_in_database_1` ('xxx', 235, 'yyy', 'zzz', '15:00:00', '17:25:00', 'ttt', 1, @toto)
--------------
 
--------------
select @toto
--------------
 
+-------+
| @toto |
+-------+
|    -1 |
+-------+
--------------
set @toto = null
--------------
 
--------------
call `is_leg_id_in_database_2` ('xxx', 235, 'yyy', 'zzz', '15:00:00', '17:25:00', 'ttt', 5, @toto)
--------------
 
--------------
select @toto
--------------
 
+-------+
| @toto |
+-------+
|    17 |
+-------+
--------------
call `is_leg_id_in_database_2` ('xxx', 235, 'yyy', 'zzz', '15:00:00', '17:25:00', 'ttt', 1, @toto)
--------------
 
--------------
select @toto
--------------
 
+-------+
| @toto |
+-------+
|    -1 |
+-------+
--------------
COMMIT
--------------
 
--------------
SET AUTOCOMMIT = 1
--------------
 
 
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Probleme avec retour de procedure

SQL Procédural MySQL

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