基础功能

lib/utils/book_dao.dart

@@ -0,0 +1,81 @@
+import 'package:sqflite/sqflite.dart';
+import '../models/data_models.dart';
+import 'database_helper.dart';
+
+/// 书籍数据访问对象
+class BookDao {
+  final DatabaseHelper _dbHelper = DatabaseHelper.instance;
+
+  // 获取所有书籍记录
+  Future<List<Book>> getAllBooks() async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query('books');
+
+    return List.generate(maps.length, (i) {
+      return Book(
+        id: maps[i]['id'].toString(),
+        title: maps[i]['title'],
+        author: maps[i]['author'],
+        cover: maps[i]['cover'],
+        rating: maps[i]['rating']?.toDouble(),
+        status: maps[i]['status'],
+        readDate: maps[i]['read_date'] != null 
+            ? DateTime.parse(maps[i]['read_date']) 
+            : null,
+        note: maps[i]['note'],
+      );
+    });
+  }
+
+  // 根据状态筛选书籍记录
+  Future<List<Book>> getBooksByStatus(String status) async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: 'status = ?',
+      whereArgs: [status],
+    );
+
+    return List.generate(maps.length, (i) {
+      return Book(
+        id: maps[i]['id'].toString(),
+        title: maps[i]['title'],
+        author: maps[i]['author'],
+        cover: maps[i]['cover'],
+        rating: maps[i]['rating']?.toDouble(),
+        status: maps[i]['status'],
+        readDate: maps[i]['read_date'] != null 
+            ? DateTime.parse(maps[i]['read_date']) 
+            : null,
+        note: maps[i]['note'],
+      );
+    });
+  }
+
+  // 添加书籍记录
+  Future<int> insertBook(Book book) async {
+    final db = await _dbHelper.database;
+    return await db.insert('books', book.toJson());
+  }
+
+  // 更新书籍记录
+  Future<int> updateBook(Book book) async {
+    final db = await _dbHelper.database;
+    return await db.update(
+      'books',
+      book.toJson(),
+      where: 'id = ?',
+      whereArgs: [book.id],
+    );
+  }
+
+  // 删除书籍记录
+  Future<int> deleteBook(String id) async {
+    final db = await _dbHelper.database;
+    return await db.delete(
+      'books',
+      where: 'id = ?',
+      whereArgs: [id],
+    );
+  }
+}