first commit

untitled/lib/service/ClassService.dart

@@ -0,0 +1,48 @@
+import 'package:peach/config/_.dart';
+import 'package:peach/entity/_.dart';
+import 'package:peach/db/SQLite.dart';
+import 'package:peach/service/_.dart';
+
+class ClassService {
+
+  static String tableNamePrincipal = "Principal"; // 默认菜单
+  static String tableNameAdditional = "Additional";// 可选菜单
+
+  /// 向指定表插入List数据
+  static Future<void> addList(String tableName, List<Principal> res) async {
+    List<Map<String, dynamic>> data = await ClassService.findAll(tableName);
+    // 如果表中没有数据，执行插入
+    if (data.isEmpty) {
+      var _db = await SQLite().db;
+      res.forEach((e) async {
+        await _db.insert(tableName, e.toJson());
+      });
+    }
+  }
+
+  /// 查询指定表中菜单数据
+  static Future<List<Map<String, dynamic>>> findAll(String tableName) async {
+    var _db = await await SQLite().db;
+    List<Map<String, dynamic>> result = await _db.query(tableName, orderBy: "id DESC");
+    return result.isNotEmpty
+          ? result
+          : [];
+  }
+
+  /// 添加菜单到指定表
+  static Future<int> add({ String tableName , Principal item }) async {
+    var _db = await SQLite().db;
+    return await _db.insert(tableName, item.toJson());
+  }
+
+  /// 从指定表删除菜单
+  static Future<int> delete({ String tableName , Principal item }) async {
+    var _db = await await SQLite().db;
+    return await _db.delete(
+        tableName,
+        where: 'id = ?',
+        whereArgs: [item.id]
+    );
+  }
+
+}