356 lines
11 KiB
Python
356 lines
11 KiB
Python
"""
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Couche d'abstraction pour la base de données.
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Pattern similaire aux interfaces Java avec implémentations multiples.
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"""
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import os
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from abc import ABC, abstractmethod
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from typing import Any, List, Optional, Tuple
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class DatabaseBackend(ABC):
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"""Interface abstraite pour les backends de base de données (comme une interface Java)"""
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@abstractmethod
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def connect(self):
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"""Établit une connexion à la base de données"""
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pass
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@abstractmethod
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def execute(self, query: str, params: Tuple = ()) -> Any:
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"""Exécute une requête et retourne le curseur"""
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pass
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@abstractmethod
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def fetchone(self, query: str, params: Tuple = ()) -> Optional[Tuple]:
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"""Exécute une requête et retourne une ligne"""
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pass
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@abstractmethod
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def fetchall(self, query: str, params: Tuple = ()) -> List[Tuple]:
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"""Exécute une requête et retourne toutes les lignes"""
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pass
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@abstractmethod
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def commit(self):
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"""Commit la transaction en cours"""
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pass
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@abstractmethod
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def close(self):
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"""Ferme la connexion"""
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pass
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@abstractmethod
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def get_placeholder(self) -> str:
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"""Retourne le placeholder pour les requêtes paramétrées"""
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pass
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@abstractmethod
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def recreate_database(self):
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"""Recrée complètement la base de données"""
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pass
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@abstractmethod
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def get_create_users_table_sql(self) -> str:
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"""Retourne le SQL pour créer la table Users"""
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pass
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@abstractmethod
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def get_create_ue_table_sql(self) -> str:
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"""Retourne le SQL pour créer la table UE"""
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pass
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@abstractmethod
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def get_create_matieres_table_sql(self) -> str:
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"""Retourne le SQL pour créer la table Matieres"""
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pass
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@abstractmethod
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def get_create_notes_table_sql(self) -> str:
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"""Retourne le SQL pour créer la table Notes"""
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pass
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class SQLiteBackend(DatabaseBackend):
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"""Implémentation SQLite du backend de base de données"""
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def __init__(self, db_path: str = "cours.db"):
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self.db_path = db_path
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self.connection = None
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self.cursor = None
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def connect(self):
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import sqlite3
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self.connection = sqlite3.connect(self.db_path)
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self.cursor = self.connection.cursor()
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return self.connection
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def execute(self, query: str, params: Tuple = ()) -> Any:
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if not self.connection:
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self.connect()
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self.cursor.execute(query, params)
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return self.cursor
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def fetchone(self, query: str, params: Tuple = ()) -> Optional[Tuple]:
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self.execute(query, params)
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return self.cursor.fetchone()
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def fetchall(self, query: str, params: Tuple = ()) -> List[Tuple]:
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self.execute(query, params)
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return self.cursor.fetchall()
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def commit(self):
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if self.connection:
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self.connection.commit()
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def close(self):
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if self.cursor:
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self.cursor.close()
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if self.connection:
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self.connection.close()
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self.connection = None
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self.cursor = None
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def get_placeholder(self) -> str:
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return "?"
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def recreate_database(self):
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"""Pour SQLite, on supprime juste le fichier"""
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import os
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if os.path.exists(self.db_path):
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os.remove(self.db_path)
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def get_create_users_table_sql(self) -> str:
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return """
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CREATE TABLE IF NOT EXISTS Users (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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login VARCHAR(50) UNIQUE NOT NULL,
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password VARCHAR(255) NOT NULL,
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role VARCHAR(10) NOT NULL CHECK(role IN ('prof', 'eleve')),
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nom VARCHAR(100),
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prenom VARCHAR(100)
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)
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"""
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def get_create_ue_table_sql(self) -> str:
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return """
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CREATE TABLE IF NOT EXISTS UE (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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code VARCHAR(20) UNIQUE NOT NULL,
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nom VARCHAR(100) NOT NULL,
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description TEXT
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)
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"""
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def get_create_matieres_table_sql(self) -> str:
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return """
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CREATE TABLE IF NOT EXISTS Matieres (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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code VARCHAR(20) UNIQUE NOT NULL,
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nom VARCHAR(100) NOT NULL,
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ue_id INTEGER NOT NULL,
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coefficient REAL DEFAULT 1.0,
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FOREIGN KEY (ue_id) REFERENCES UE(id) ON DELETE CASCADE
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)
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"""
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def get_create_notes_table_sql(self) -> str:
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return """
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CREATE TABLE IF NOT EXISTS Notes (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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eleve_id INTEGER NOT NULL,
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matiere_id INTEGER NOT NULL,
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note REAL NOT NULL CHECK(note >= 0 AND note <= 20),
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date_creation TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (eleve_id) REFERENCES Users(id) ON DELETE CASCADE,
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FOREIGN KEY (matiere_id) REFERENCES Matieres(id) ON DELETE CASCADE
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)
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"""
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class MariaDBBackend(DatabaseBackend):
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"""Implémentation MariaDB/MySQL du backend de base de données"""
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def __init__(
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self,
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host: str = "mariadb",
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user: str = "root",
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password: str = "un-bon-mdp-solide",
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database: str = "APPNOTE",
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):
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self.config = {
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"host": host,
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"user": user,
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"password": password,
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"database": database,
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}
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self.database_name = database
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self.connection = None
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self.cursor = None
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def connect(self):
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import mysql.connector
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self.connection = mysql.connector.connect(**self.config)
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self.cursor = self.connection.cursor()
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return self.connection
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def execute(self, query: str, params: Tuple = ()) -> Any:
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if not self.connection:
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self.connect()
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self.cursor.execute(query, params)
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return self.cursor
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def fetchone(self, query: str, params: Tuple = ()) -> Optional[Tuple]:
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self.execute(query, params)
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return self.cursor.fetchone()
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def fetchall(self, query: str, params: Tuple = ()) -> List[Tuple]:
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self.execute(query, params)
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return self.cursor.fetchall()
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def commit(self):
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if self.connection:
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self.connection.commit()
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def close(self):
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if self.cursor:
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self.cursor.close()
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if self.connection:
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self.connection.close()
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self.connection = None
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self.cursor = None
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def get_placeholder(self) -> str:
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return "%s"
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def recreate_database(self):
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"""Pour MariaDB, on drop/create la base"""
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import mysql.connector
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# Connexion sans spécifier la base
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config_without_db = {
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"host": self.config["host"],
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"user": self.config["user"],
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"password": self.config["password"],
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}
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con = mysql.connector.connect(**config_without_db)
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cur = con.cursor()
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cur.execute(f"DROP DATABASE IF EXISTS {self.database_name}")
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cur.execute(f"CREATE DATABASE {self.database_name}")
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cur.execute(f"USE {self.database_name}")
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con.commit()
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cur.close()
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con.close()
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def get_create_users_table_sql(self) -> str:
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return """
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CREATE TABLE Users (
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id INT AUTO_INCREMENT PRIMARY KEY,
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login VARCHAR(50) UNIQUE NOT NULL,
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password VARCHAR(255) NOT NULL,
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role ENUM('prof', 'eleve') NOT NULL,
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nom VARCHAR(100),
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prenom VARCHAR(100)
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)
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"""
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def get_create_ue_table_sql(self) -> str:
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return """
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CREATE TABLE UE (
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id INT AUTO_INCREMENT PRIMARY KEY,
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code VARCHAR(20) UNIQUE NOT NULL,
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nom VARCHAR(100) NOT NULL,
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description TEXT
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)
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"""
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def get_create_matieres_table_sql(self) -> str:
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return """
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CREATE TABLE Matieres (
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id INT AUTO_INCREMENT PRIMARY KEY,
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code VARCHAR(20) UNIQUE NOT NULL,
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nom VARCHAR(100) NOT NULL,
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ue_id INT NOT NULL,
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coefficient DECIMAL(5,2) DEFAULT 1.0,
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FOREIGN KEY (ue_id) REFERENCES UE(id) ON DELETE CASCADE
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)
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"""
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def get_create_notes_table_sql(self) -> str:
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return """
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CREATE TABLE Notes (
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id INT AUTO_INCREMENT PRIMARY KEY,
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eleve_id INT NOT NULL,
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matiere_id INT NOT NULL,
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note DECIMAL(4,2) NOT NULL CHECK(note >= 0 AND note <= 20),
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date_creation TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (eleve_id) REFERENCES Users(id) ON DELETE CASCADE,
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FOREIGN KEY (matiere_id) REFERENCES Matieres(id) ON DELETE CASCADE
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)
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"""
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class Database:
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"""Wrapper pour le backend avec context manager (pattern Facade)"""
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def __init__(self, backend: DatabaseBackend):
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self.backend = backend
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def execute(self, query: str, params: Tuple = ()) -> Any:
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"""Exécute une requête"""
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return self.backend.execute(query, params)
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def fetchone(self, query: str, params: Tuple = ()) -> Optional[Tuple]:
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"""Exécute et retourne une ligne"""
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return self.backend.fetchone(query, params)
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def fetchall(self, query: str, params: Tuple = ()) -> List[Tuple]:
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"""Exécute et retourne toutes les lignes"""
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return self.backend.fetchall(query, params)
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def commit(self):
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"""Commit la transaction"""
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self.backend.commit()
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def close(self):
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"""Ferme la connexion"""
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self.backend.close()
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def __enter__(self):
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"""Support du context manager"""
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self.backend.connect()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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"""Ferme automatiquement la connexion"""
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if exc_type is None:
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self.commit()
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self.close()
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def get_database() -> Database:
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"""
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Factory pour créer le bon backend selon la configuration.
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Pattern Factory Method.
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"""
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db_type = os.getenv("DB_TYPE", "mariadb").lower()
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if db_type == "sqlite":
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db_path = os.getenv("SQLITE_DB_PATH", "cours.db")
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backend = SQLiteBackend(db_path)
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else: # mariadb par défaut
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host = os.getenv("DB_HOST", "mariadb")
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user = os.getenv("DB_USER", "root")
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password = os.getenv("DB_PASSWORD", "caca")
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database = os.getenv("DB_NAME", "APPNOTE")
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backend = MariaDBBackend(host, user, password, database)
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return Database(backend)
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