🎉 init: 小龙的工作空间

cases/mealprep-v2/backend/src/services/order_item.ts

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