117 lines
2.7 KiB
Plaintext
117 lines
2.7 KiB
Plaintext
---
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title: Conception de la Base de Données
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description: MCD, MLD et MPD de MemeGoat.
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---
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## Modèle Conceptuel des Données (MCD)
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Le MCD définit les entités et leurs relations.
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```mermaid
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erDiagram
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UTILISATEUR ||--o{ MEME : "crée"
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UTILISATEUR ||--o{ COMMENTAIRE : "écrit"
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MEME ||--o{ COMMENTAIRE : "reçoit"
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MEME }o--o{ TAG : "possède"
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UTILISATEUR {
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string pseudo
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string email
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string mot_de_passe
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datetime date_creation
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}
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MEME {
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string titre
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string url_image
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datetime date_creation
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}
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TAG {
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string nom
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}
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COMMENTAIRE {
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string contenu
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datetime date_creation
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}
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```
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## Modèle Logique des Données (MLD)
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Le MLD traduit le MCD en tables avec les clés étrangères.
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```mermaid
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erDiagram
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users ||--o{ memes : "user_id"
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users ||--o{ comments : "user_id"
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memes ||--o{ comments : "meme_id"
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memes ||--o{ meme_tags : "meme_id"
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tags ||--o{ meme_tags : "tag_id"
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users {
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uuid id PK
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varchar username
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varchar email
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text password_hash
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timestamp created_at
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}
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memes {
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uuid id PK
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varchar title
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text image_url
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uuid user_id FK
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timestamp created_at
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}
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tags {
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uuid id PK
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varchar name
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}
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meme_tags {
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uuid meme_id FK
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uuid tag_id FK
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}
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comments {
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uuid id PK
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text content
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uuid user_id FK
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uuid meme_id FK
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timestamp created_at
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}
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```
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## Modèle Physique des Données (MPD)
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Implémentation SQL pour PostgreSQL.
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```sql
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CREATE TABLE users (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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username VARCHAR(50) UNIQUE NOT NULL,
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email VARCHAR(255) UNIQUE NOT NULL,
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password_hash TEXT NOT NULL,
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created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE memes (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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title VARCHAR(255) NOT NULL,
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image_url TEXT NOT NULL,
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user_id UUID REFERENCES users(id) ON DELETE SET NULL,
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created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE tags (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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name VARCHAR(50) UNIQUE NOT NULL
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);
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CREATE TABLE meme_tags (
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meme_id UUID REFERENCES memes(id) ON DELETE CASCADE,
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tag_id UUID REFERENCES tags(id) ON DELETE CASCADE,
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PRIMARY KEY (meme_id, tag_id)
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);
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CREATE TABLE comments (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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content TEXT NOT NULL,
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user_id UUID REFERENCES users(id) ON DELETE SET NULL,
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meme_id UUID REFERENCES memes(id) ON DELETE CASCADE,
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created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
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);
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```
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