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Bonjour,
J’ai une question en POO pour un site web réalisé en .net (c# 3.5).
J’ai une classe MySQL qui gère tous les échanges avec le SGBD MySQL 5. 1, la
connexion est ouverte dans la constructeur et fermée dans le destructeur :
using System;
using
System.Data;
using
MySql.Data.MySqlClient;
namespace
MyTools.Data.MySql
{
///
<summary>
///
Pour requêter et mettre à jour une base de données MySQL
///
</summary>
public
class
MySqlConnector
{
///
<summary>
///
Connection à la BD
///
</summary>
private
MySqlConnection connection;
///
<summary>
///
Pour envoyer des commandes SQL
///
</summary>
private
MySqlCommand command;
///
<summary>
///
Adapteur MySQL
///
</summary>
private
MySqlDataAdapter adapter = newMySqlDataAdapter();
///
<summary>
///
Contructeur de requêtes
///
</summary>
MySqlCommandBuilder
sqlBuilder;
///
<summary>
///
Contructeur
///
</summary>
///
Serveur où se
trouve la base
///
Base de données à
utilisée
///
Utilisateur
///
Mot de passe
public
MySqlConnector(string server, string dataBase, string
uid, string password)
{
connection = newMySqlConnection("server="
+ server + ";database=" + dataBase
+ ";uid=" + uid + ";password=" + password + ";");
command = connection.CreateCommand();
sqlBuilder = newMySqlCommandBuilder(adapter);
connection.Open();
}
///
<summary>
///
Destructeur
///
</summary>
~MySqlConnector()
{
try
{
connection.Close();
}
catch { }
}
[autres méthodes pour faire select, update, …]
Dans mon métier, j’ai une classe qui utilise le patern Singleton :
using
System;
using
MyTools.Data.MySql;
using
System.Configuration;
namespace
Toto.Core
{
public
class
Core
{
///
<summary>
///
Connecteur à la base de données MySQL
///
</summary>
private
static
MySqlConnector
mysql;
///
<summary>
///
Connecteur à la base de données MySQL
///
</summary>
public
static
MySqlConnector
Mysql {
get {
if
(mysql == null)
mysql = newMySqlConnector(ConfigurationSettings.AppSettings["mysqlServer"],
ConfigurationSettings.AppSettings["mysqlDataBase"],
ConfigurationSettings.AppSettings["mysqlUid"],
ConfigurationSettings.AppSettings["mysqlPassword"]);
return
mysql;
}
}
}
}
Mon problème est que l’exécution ne passe jamais par le
destructeur de MySQL à la fin du chargement de chaque page. Du coup la
connexion à MySQL reste ouverte.
A quel moment la référence « mysql » de la classe Core est détruite ?
Peut-être faut-il alors que je gère la connexion et la déconnexion dans chacune
des méthodes de ma classe MySQL mais cela altère considérablement les
performances … Je préfèrerai que la connexion soit ouverte au chargement de la
page et se referme une fois la page chargée.
De plus je tiens absolument à garde cette architecte Singleton pour pouvoir
appeler la référence à MySQL dans toutes mes classes métiers, je n’ai pas envie
de devoir créer mon objet MySQL à chaque fois que j’en ai besoin …
J’avoue que je suis un peu perdu … si quelqu’un avait des pistes à me proposer
pour résoudre mon problème.
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