笔记功能初步完善

lib/utils/book_dao.dart

@@ -6,25 +6,17 @@ import 'database_helper.dart';
 class BookDao {
   final DatabaseHelper _dbHelper = DatabaseHelper.instance;
 
-  // 获取所有书籍记录
+  // 获取所有未删除的书籍记录
   Future<List<Book>> getAllBooks() async {
     final db = await _dbHelper.database;
-    final List<Map<String, dynamic>> maps = await db.query('books');
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: 'is_deleted = ?',
+      whereArgs: [0],
+      orderBy: 'updated_at DESC',
+    );
 
-    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'],
-      );
-    });
+    return List.generate(maps.length, (i) => Book.fromJson(maps[i]));
   }
 
   // 根据状态筛选书籍记录
@@ -32,24 +24,25 @@ class BookDao {
     final db = await _dbHelper.database;
     final List<Map<String, dynamic>> maps = await db.query(
       'books',
-      where: 'status = ?',
-      whereArgs: [status],
+      where: 'status = ? AND is_deleted = ?',
+      whereArgs: [status, 0],
+      orderBy: 'updated_at DESC',
     );
 
-    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'],
-      );
-    });
+    return List.generate(maps.length, (i) => Book.fromJson(maps[i]));
+  }
+
+  // 根据ID获取书籍
+  Future<Book?> getBookById(String id) async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: 'id = ? AND is_deleted = ?',
+      whereArgs: [id, 0],
+    );
+
+    if (maps.isEmpty) return null;
+    return Book.fromJson(maps.first);
   }
 
   // 添加书籍记录
@@ -69,7 +62,21 @@ class BookDao {
     );
   }
 
-  // 删除书籍记录
+  // 软删除书籍记录
+  Future<int> softDeleteBook(String id) async {
+    final db = await _dbHelper.database;
+    return await db.update(
+      'books',
+      {
+        'is_deleted': 1,
+        'updated_at': DateTime.now().toIso8601String(),
+      },
+      where: 'id = ?',
+      whereArgs: [id],
+    );
+  }
+
+  // 彻底删除书籍记录
   Future<int> deleteBook(String id) async {
     final db = await _dbHelper.database;
     return await db.delete(
@@ -78,4 +85,43 @@ class BookDao {
       whereArgs: [id],
     );
   }
+
+  // 搜索书籍（标题、别名）
+  Future<List<Book>> searchBooks(String query) async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: '(title LIKE ? OR alternate_titles LIKE ?) AND is_deleted = ?',
+      whereArgs: ['%$query%', '%$query%', 0],
+      orderBy: 'updated_at DESC',
+    );
+
+    return List.generate(maps.length, (i) => Book.fromJson(maps[i]));
+  }
+
+  // 根据作者筛选
+  Future<List<Book>> getBooksByAuthor(String author) async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: 'authors LIKE ? AND is_deleted = ?',
+      whereArgs: ['%$author%', 0],
+      orderBy: 'updated_at DESC',
+    );
+
+    return List.generate(maps.length, (i) => Book.fromJson(maps[i]));
+  }
+
+  // 根据类型筛选
+  Future<List<Book>> getBooksByGenre(String genre) async {
+    final db = await _dbHelper.database;
+    final List<Map<String, dynamic>> maps = await db.query(
+      'books',
+      where: 'genres LIKE ? AND is_deleted = ?',
+      whereArgs: ['%$genre%', 0],
+      orderBy: 'updated_at DESC',
+    );
+
+    return List.generate(maps.length, (i) => Book.fromJson(maps[i]));
+  }
 }