Design Patterns MCP Server

{ "id": "active-record", "name": "Active Record", "category": "Enterprise", "description": "Object that wraps a row in database table, encapsulates database access and adds domain logic", "when_to_use": "Simple domain logic\nDatabase-driven design\nRapid development", "benefits": "Simple implementation\nDirect mapping\nEasy to understand", "drawbacks": "Tight coupling\nTesting difficulties\nLimited flexibility", "use_cases": "Simple CRUD applications\nPrototyping\nDatabase-centric apps", "complexity": "Low", "tags": [ "enterprise", "data-source", "coupling" ], "examples": { "typescript": { "language": "typescript", "code": "// Active Record: domain object with database logic\nclass User {\n id?: string;\n email: string;\n name: string;\n \n constructor(data: { id?: string; email: string; name: string }) {\n this.id = data.id;\n this.email = data.email;\n this.name = data.name;\n }\n \n async save(): Promise<void> {\n if (this.id) {\n await db.query(\n 'UPDATE users SET email = ?, name = ? WHERE id = ?',\n [this.email, this.name, this.id]\n );\n } else {\n const result = await db.query(\n 'INSERT INTO users (email, name) VALUES (?, ?)',\n [this.email, this.name]\n );\n this.id = result.insertId;\n }\n }\n \n async delete(): Promise<void> {\n if (this.id) {\n await db.query('DELETE FROM users WHERE id = ?', [this.id]);\n }\n }\n \n static async find(id: string): Promise<User | null> {\n const row = await db.query('SELECT * FROM users WHERE id = ?', [id]);\n return row ? new User(row) : null;\n }\n \n static async findByEmail(email: string): Promise<User | null> {\n const row = await db.query('SELECT * FROM users WHERE email = ?', [email]);\n return row ? new User(row) : null;\n }\n}\n\n// Usage\nconst user = new User({ email: 'user@example.com', name: 'John' });\nawait user.save();\n\nconst found = await User.find(user.id!);\nfound.name = 'Jane';\nawait found.save();" } } }