mysql学习记录（十）--存储过程_MySQL
processus
mysql> use test1;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database change
mysql> select * from emp;
+------------+----------+------+--------+
| ename | hiredate | sal | deptno |
+------------+----------+------+--------+
| aaaaa | NULL | NULL | 1 |
| cccccccccc | NULL | NULL | 2 |
| ddddddddd | NULL | NULL | 3 |
| ffffff | NULL | NULL | 4 |
| ggg | NULL | NULL | 5 |
| a1 | NULL | NULL | 5 |
+------------+----------+------+--------+
6 rows in set (0.00 sec)
mysql> show create table emp \G;
*************************** 1. row ***************************
Table: emp
Create Table: CREATE TABLE `emp` (
`ename` varchar(10) DEFAULT NULL,
`hiredate` date DEFAULT NULL,
`sal` decimal(10,2) DEFAULT NULL,
`deptno` int(2) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.01 sec)
ERROR:
No query specified
mysql> DELIMITER &&
mysql> CREATE PROCEDURE num_from_employee (IN input_deptno int, OUT count_num INT )
-> READS SQL DATA
-> BEGIN
-> SELECT COUNT(*) FROM emp WHERE deptno=input_deptno ;
-> END &&
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> call num_from_employee(5,@a);
+----------+
| COUNT(*) |
+----------+
| 2 |
+----------+
1 row in set (0.02 sec)
Query OK, 0 rows affected (0.02 sec)
mysql> call num_from_employee(1,@a);
+----------+
| COUNT(*) |
+----------+
| 1 |
+----------+
1 row in set (0.01 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> create table inventory(
-> film_id int(11),
-> store_id int(11),
-> inventory_in_stock varchar(50)
-> ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.02 sec)
mysql> insert into inventory(film_id,store_id,inventory_in_stock) values (1,2,'aaaaaaaa'), (3,4,'bbbb'), (5,6,'cccccccccc'), (7,8,'dddddd'), (9,10,'fff');
Query OK, 5 rows affected (0.00 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql> select * from inventory;
+---------+----------+--------------------+
| film_id | store_id | inventory_in_stock |
+---------+----------+--------------------+
| 1 | 2 | aaaaaaaa |
| 3 | 4 | bbbb |
| 5 | 6 | cccccccccc |
| 7 | 8 | dddddd |
| 9 | 10 | fff |
+---------+----------+--------------------+
5 rows in set (0.00 sec)
mysql> delimiter $$
mysql> create procedure film_in_stock(in p_film_id int,in p_store_id int,out p_film_count int)
-> reads sql data
-> begin
-> select film_id
-> from inventory
-> where film_id = p_film_id
-> and store_id = p_store_id;
-> select found_rows() into p_film_count;
-> end $$
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> call film_in_stock(5,6,@a);
+---------+
| film_id |
+---------+
| 5 |
+---------+
1 row in set (0.01 sec)
Query OK, 1 row affected (0.01 sec)
mysql> show create procedure film_in_stock \G;
*************************** 1. row ***************************
Procedure: film_in_stock
sql_mode:
Create Procedure: CREATE DEFINER=`root`@`localhost` PROCEDURE `film_in_stock`(in p_film_id int,in p_store_id int,out p_film_count int)
READS SQL DATA
begin
select film_id
from inventory
where film_id = p_film_id
and store_id = p_store_id;
select found_rows() into p_film_count;
end
character_set_client: utf8
collation_connection: utf8_general_ci
Database Collation: utf8_general_ci
1 row in set (0.01 sec)
ERROR:
No query specified
mysql> create table actor(
-> actor_id int(11) NOT NULL AUTO_INCREMENT ,
-> first_name varchar(30),
-> last_name varchar(30),
-> PRIMARY KEY (actor_id)
-> ) engine = innodb charset = utf8;
Query OK, 0 rows affected (0.02 sec)
mysql> delimiter $$
mysql> create procedure actor_insert()
-> begin
-> set @x = 1;
-> insert into actor(actor_id,first_name,last_name) values (201,'Test',201);
-> set @x = 2;
-> insert into actor(actor_id,first_name,last_name) values(1,'Test','1');
-> set @x = 3;
-> end $$
Query OK, 0 rows affected (0.01 sec)
mysql> call actor_insert();
Query OK, 0 rows affected (0.02 sec)
mysql> call actor_insert();
ERROR 1062 (23000): Duplicate entry '201' for key 'PRIMARY'
mysql> select @x;
+------+
| @x |
+------+
| 1 |
+------+
1 row in set (0.00 sec)
mysql> delimiter $$
mysql> create procedure actor_insert_new()
-> begin
-> DECLARE CONTINUE HANDLER FOR SQLSTATE '23000' SET @x2 = 1;
-> set @x = 1;
-> insert into actor(actor_id,first_name,last_name) values (201,'Test',201);
-> set @x = 2;
-> insert into actor(actor_id,first_name,last_name) values(1,'Test','1');
-> set @x = 3;
-> end $$
Query OK, 0 rows affected (0.02 sec)
mysql> delimiter ;
mysql> call actor_insert_new();
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> call actor_insert_new();
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> select @x,@x2;
+------+------+
| @x | @x2 |
+------+------+
| 3 | 1 |
+------+------+
1 row in set (0.00 sec)
mysql> show create table payment \G;
*************************** 1. row ***************************
Table: payment
Create Table: CREATE TABLE `payment` (
`staff_id` int(11) DEFAULT NULL,
`amount` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8
1 row in set (0.01 sec)
ERROR:
No query specified
mysql> select * from payment;
+----------+--------+
| staff_id | amount |
+----------+--------+
| 1 | 10000 |
| 2 | 20000 |
| 3 | 30000 |
| 4 | 400000 |
| 5 | 500000 |
+----------+--------+
5 rows in set (0.01 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
-> declare tmp_name varchar(30) default "";
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> select i_staff_id,d_amount;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> call payment_stat();
+------------+----------+
| i_staff_id | d_amount |
+------------+----------+
| 1 | 10000 |
+------------+----------+
1 row in set (0.01 sec)
+------------+----------+
| i_staff_id | d_amount |
+------------+----------+
| 2 | 20000 |
+------------+----------+
1 row in set (0.01 sec)
+------+------+
| @x1 | @x2 |
+------+------+
| 0 | 0 |
+------+------+
1 row in set (0.01 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> drop procedure payment_stat;
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
-> declare tmp_name varchar(30) default "";
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> set @x1 = @x1+ i_staff_id;
-> else
-> set @x2 = @x2+ d_amount;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.01 sec)
mysql> call payment_stat();
-> $$
+------+-------+
| @x1 | @x2 |
+------+-------+
| 3 | 30000 |
+------+-------+
1 row in set (0.01 sec)
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
->
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> set @x1 = @x1+ i_staff_id + 1;
-> else
-> set @x2 = @x2+ d_amount ;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter ;
mysql> call payment_stat();
+------+-------+
| @x1 | @x2 |
+------+-------+
| 3 | 30000 |
+------+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> drop procedure payment_stat;
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
->
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> set @x1 = @x1+ i_staff_id;
-> else
-> set @x2 = @x2+ d_amount;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter ;
mysql> call payment_stat();
+------+-------+
| @x1 | @x2 |
+------+-------+
| 3 | 30000 |
+------+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
->
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> set @x1 = @x1+ i_staff_id + 1;
-> else
-> set @x2 = @x2+ d_amount;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> call payment_stat();
+------+-------+
| @x1 | @x2 |
+------+-------+
| 5 | 30000 |
+------+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> drop procedure payment_stat;
Query OK, 0 rows affected (0.02 sec)
mysql> delimiter $$
mysql> create procedure payment_stat()
-> begin
-> DECLARE i_staff_id int;
-> DECLARE d_amount int;
->
-> DECLARE cur_payment cursor for select staff_id,amount from payment;
-> DECLARE EXIT HANDLER FOR NOT FOUND CLOSE cur_payment;
->
-> set @x1 = 0 ;
-> set @x2 = 0 ;
->
-> open cur_payment;
-> fetch cur_payment into i_staff_id,d_amount;
-> while(i_staff_id <=3 )
-> do
-> if i_staff_id < 3 then
-> set @x1 = @x1+ i_staff_id + 6;
-> else
-> set @x2 = @x2+ d_amount + 5;
-> end if;
-> fetch cur_payment into i_staff_id,d_amount;
-> end while;
-> close cur_payment;
->
-> select @x1,@x2;
-> end;
-> $$
Query OK, 0 rows affected (0.01 sec)
mysql> delimiter ;
mysql> call payment_stat();
+------+-------+
| @x1 | @x2 |
+------+-------+
| 15 | 30005 |
+------+-------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER $$
mysql>
mysql> CREATE PROCEDURE addNum()
-> BEGIN
-> DECLARE x INT;
-> SET x = 0;
-> for_loop : LOOP
-> SET x = x + 1;
-> IF x > 30 THEN
-> LEAVE for_loop;
-> END IF;
-> IF mod(x,2) = 0 then
-> select "num:",x;
-> ITERATE for_loop;
-> END IF;
-> END LOOP;
-> select "count:",x;
-> END $$
Query OK, 0 rows affected (0.01 sec)
mysql> call addNum();
-> $$
+------+------+
| num: | x |
+------+------+
| num: | 2 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 4 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 6 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 8 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 10 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 12 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 14 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 16 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 18 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 20 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 22 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 24 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 26 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 28 |
+------+------+
1 row in set (0.00 sec)
+------+------+
| num: | x |
+------+------+
| num: | 30 |
+------+------+
1 row in set (0.00 sec)
+--------+------+
| count: | x |
+--------+------+
| count: | 31 |
+--------+------+
1 row in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
mysql> delimiter $$
mysql> create procedure repeatPractise()
-> begin
-> set @v = 0 ;
-> REPEAT
-> set @v = @v+ 1;
-> UNTIL @v >=5
-> END REPEAT;
-> END
-> $$
Query OK, 0 rows affected (0.01 sec)
mysql> call repeatPractise();
-> $$
Query OK, 0 rows affected (0.00 sec)
mysql> select @v;
-> $$
+------+
| @v |
+------+
| 5 |
+------+
1 row in set (0.00 sec)Copier après la connexion
Déclaration de ce site Web
Le contenu de cet article est volontairement contribué par les internautes et les droits d'auteur appartiennent à l'auteur original. Ce site n'assume aucune responsabilité légale correspondante. Si vous trouvez un contenu suspecté de plagiat ou de contrefaçon, veuillez contacter admin@php.cn
Outils d'IA chauds
Undresser.AI Undress
Application basée sur l'IA pour créer des photos de nu réalistes
AI Clothes Remover
Outil d'IA en ligne pour supprimer les vêtements des photos.
Undress AI Tool
Images de déshabillage gratuites
Clothoff.io
Dissolvant de vêtements AI
AI Hentai Generator
Générez AI Hentai gratuitement.
Article chaud
R.E.P.O. Crystals d'énergie expliqués et ce qu'ils font (cristal jaune)
2 Il y a quelques semaines
By 尊渡假赌尊渡假赌尊渡假赌
Combien de temps faut-il pour battre Split Fiction?
1 Il y a quelques mois
By DDD
R.E.P.O. Enregistrer l'emplacement du fichier: où est-il et comment le protéger?
1 Il y a quelques mois
By DDD
R.E.P.O. Meilleurs paramètres graphiques
2 Il y a quelques semaines
By 尊渡假赌尊渡假赌尊渡假赌
Assassin's Creed Shadows: Solution d'énigmes de coquille
1 Il y a quelques semaines
By DDD
Outils chauds
Bloc-notes++7.3.1
Éditeur de code facile à utiliser et gratuit
SublimeText3 version chinoise
Version chinoise, très simple à utiliser
Envoyer Studio 13.0.1
Puissant environnement de développement intégré PHP
Dreamweaver CS6
Outils de développement Web visuel
SublimeText3 version Mac
Logiciel d'édition de code au niveau de Dieu (SublimeText3)
Sujets chauds
Comment modifier une table dans MySQL en utilisant l'instruction ALTER TABLE?
Mar 19, 2025 pm 03:51 PM
L'article discute de l'utilisation de l'instruction ALTER TABLE de MySQL pour modifier les tables, notamment en ajoutant / abandon les colonnes, en renommant des tables / colonnes et en modifiant les types de données de colonne.
Comment configurer le cryptage SSL / TLS pour les connexions MySQL?
Mar 18, 2025 pm 12:01 PM
L'article discute de la configuration du cryptage SSL / TLS pour MySQL, y compris la génération et la vérification de certificat. Le problème principal est d'utiliser les implications de sécurité des certificats auto-signés. [Compte de caractère: 159]
Comment gérez-vous les grands ensembles de données dans MySQL?
Mar 21, 2025 pm 12:15 PM
L'article traite des stratégies pour gérer de grands ensembles de données dans MySQL, y compris le partitionnement, la rupture, l'indexation et l'optimisation des requêtes.
Quels sont les outils de GUI MySQL populaires (par exemple, MySQL Workbench, PhpMyAdmin)?
Mar 21, 2025 pm 06:28 PM
L'article traite des outils de GUI MySQL populaires comme MySQL Workbench et PhpMyAdmin, en comparant leurs fonctionnalités et leur pertinence pour les débutants et les utilisateurs avancés. [159 caractères]
Comment déposez-vous une table dans MySQL à l'aide de l'instruction TABLE DROP?
Mar 19, 2025 pm 03:52 PM
L'article discute de la suppression des tables dans MySQL en utilisant l'instruction TABLE DROP, mettant l'accent sur les précautions et les risques. Il souligne que l'action est irréversible sans sauvegardes, détaillant les méthodes de récupération et les risques potentiels de l'environnement de production.
Comment représentez-vous des relations en utilisant des clés étrangères?
Mar 19, 2025 pm 03:48 PM
L'article discute de l'utilisation de clés étrangères pour représenter les relations dans les bases de données, en se concentrant sur les meilleures pratiques, l'intégrité des données et les pièges communs à éviter.
Comment créez-vous des index sur les colonnes JSON?
Mar 21, 2025 pm 12:13 PM
L'article discute de la création d'index sur les colonnes JSON dans diverses bases de données comme PostgreSQL, MySQL et MongoDB pour améliorer les performances de la requête. Il explique la syntaxe et les avantages de l'indexation des chemins JSON spécifiques et répertorie les systèmes de base de données pris en charge.
Comment sécuriser MySQL contre les vulnérabilités communes (injection SQL, attaques par force brute)?
Mar 18, 2025 pm 12:00 PM
L'article discute de la sécurisation MySQL contre l'injection SQL et les attaques brutales à l'aide de déclarations préparées, de validation des entrées et de politiques de mot de passe solides (159 caractères)
