🎉 init: 小龙的工作空间

cases/mealprep-v3/backend/src/services/product.ts

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+// Auto-generated Product service
+import { queryAll, queryOne, execute } from "../db/client.js";
+import type { Product, CreateProductInput, UpdateProductInput } from "../types/index.js";
+
+export class ProductService {
+  /** List all products */
+  list(): Product[] {
+    return queryAll<Product>("SELECT * FROM products ORDER BY created_at DESC");
+  }
+
+  /** Get by ID */
+  getById(id: string): Product | undefined {
+    return queryOne<Product>("SELECT * FROM products WHERE id = ?", [id]);
+  }
+
+  /** Create */
+  create(input: CreateProductInput): Product {
+    const id = crypto.randomUUID();
+    const now = new Date().toISOString();
+    const hasCreatedAt = true;
+    const hasUpdatedAt = false;
+    const cols = ["id", "title", "price", "stock", "images", "category_id", "created_at"];
+    const placeholders = cols.map(() => "?").join(", ");
+    const values = [id, input.title ?? null, input.price ?? null, input.stock ?? null, input.images ?? null, input.categoryId ?? null, now];
+
+    execute(`INSERT INTO products (${cols.join(", ")}) VALUES (${placeholders})`, values);
+    return this.getById(id)!;
+  }
+
+  /** Update */
+  update(id: string, input: UpdateProductInput): Product | undefined {
+    const existing = this.getById(id);
+    if (!existing) return undefined;
+
+    const sets: string[] = [];
+    const values: unknown[] = [];
+    if (input.title !== undefined) { sets.push("title = ?"); values.push(input.title); }
+    if (input.price !== undefined) { sets.push("price = ?"); values.push(input.price); }
+    if (input.stock !== undefined) { sets.push("stock = ?"); values.push(input.stock); }
+    if (input.images !== undefined) { sets.push("images = ?"); values.push(input.images); }
+    if (input.categoryId !== undefined) { sets.push("category_id = ?"); values.push(input.categoryId); }
+
+    if (sets.length === 0) return existing;
+
+    
+
+    values.push(id);
+    execute(`UPDATE products SET ${sets.join(", ")} WHERE id = ?`, values);
+    return this.getById(id)!;
+  }
+
+  /** Delete */
+  delete(id: string): boolean {
+    const result = execute("DELETE FROM products WHERE id = ?", [id]);
+    return result.changes > 0;
+  }
+}