fix: 因應資料庫欄位修改

1. 使用Username作為primary key
2. Username, Email 皆可作為登入依據

lib/main.dart

@@ -5,6 +5,8 @@ import 'package:topic/HomePage.dart';
 import 'package:mysql_client/mysql_client.dart';
 import 'package:topic/NoSwipeBackRoute.dart';
 import 'package:topic/RegisterPage.dart';
+import 'package:validators/validators.dart' as validator;
+
 
 void main() {
   runApp(MaterialApp(
@@ -92,10 +94,20 @@ class _LoginPageState extends State<LoginPage> {
       print('输入的密碼: $password');
 
       // 查詢數據庫，检查是否有匹配的帳號
-      var result = await conn.execute(
+      IResultSet result;
-        'SELECT * FROM HomeLogin WHERE homeEmail = :email AND homePassword = :password',
+      if (validator.isEmail(email)) {
-        {'email': email, 'password': password},
+        result = await conn.execute(
-      );
+          'SELECT * FROM HomeLogin WHERE homeEmail = :email AND homePassword = :password',
+          {'email': email, 'password': password},
+        );
+      }
+      else{
+        result = await conn.execute(
+          'SELECT * FROM HomeLogin WHERE homeUserName = :email AND homePassword = :password',
+          {'email': email, 'password': password},
+        );
+        email = result.rows.first.colByName("homeEmail").toString();
+      }
 
       print('查詢結果行數: ${result.rows.length}');
 
@@ -167,7 +179,7 @@ class _LoginPageState extends State<LoginPage> {
                         border: OutlineInputBorder(),
                         prefixIcon: Icon(Icons.email_outlined),
                         //https://www.fluttericon.cn/v
-                        labelText: '電子信箱',
+                        labelText: '電子信箱/帳號',
                       ),
                     ), //電子信箱
                     SizedBox(height: 20),
@@ -220,6 +232,7 @@ class _LoginPageState extends State<LoginPage> {
                       },
                       child: Text('立即註冊'),
                       style: TextButton.styleFrom(
+                        // TODO: In physical devices, the background color of the button is transparent
                         backgroundColor: Colors.transparent, // 無背景颜色
                         textStyle: TextStyle(fontSize: 18),
                         shadowColor: Colors.transparent, // 去除陰影