🎉 init: 小龙的工作空间

cases/bookshelf-v3/backend/src/services/book.ts

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