<p>首先，我想从 MySQL Workbench 中的本地主机获取数据，我已经创建了虚拟数据库并将表放入其中，但是当我要使用 mysql1 包获取数据时，出现错误</p> <pre class="brush:php;toolbar:false;">E/flutter (15888): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: SocketException: Connection refused (OS Error: Connection refused, errno = 111), address = localhost, port = 60332 E/flutter (15888): #0 _NativeSocket.startConnect (dart:io-patch/socket_patch.dart:694:35) E/flutter (15888): #1 _NativeSocket.connect (dart:io-patch/socket_patch.dart:960:12) E/flutter (15888): #2 _RawSocket.connect (dart:io-patch/socket_patch.dart:1843:26) E/flutter (15888): #3 RawSocket.connect (dart:io-patch/socket_patch.dart:21:23) E/flutter (15888): #4 BufferedSocket.defaultSocketFactory buffered_socket.dart:72 E/flutter (15888): #5 BufferedSocket.connect buffered_socket.dart:89 E/flutter (15888): #6 MySqlConnection.connect single_connection.dart:139 E/flutter (15888): #7 Mysql.getConnection mysql.dart:11 E/flutter (15888): #8 _MyHomePageState._getCustomer main.dart:37 E/flutter (15888): #9 _InkResponseState.handleTap ink_well.dart:1096 E/flutter (15888): #10 GestureRecognizer.invokeCallback recognizer.dart:253 E/flutter (15888): #11 TapGestureRecognizer.handleTapUp tap.dart:627 E/flutter (15888): #12 BaseTapGestureRecognizer._checkUp tap.dart:306 E/flutter (15888): #13 BaseTapGestureRecognizer.acceptGesture tap.dart:276 E/flutter (15888): #14 GestureArenaManager.sweep arena.dart:163 E/flutter (15888): #15 GestureBinding.handleEvent binding.dart:464 E/flutter (15888): #16 GestureBinding.dispatchEvent binding.dart:440 E/flutter (15888): #17 RendererBinding.dispatchEvent binding.dart:336 E/flutter (15888): #18 GestureBinding._handlePointerEventImmediately binding.dart:395 E/flutter (15888): #19 GestureBinding.handlePointerEvent binding.dart:357 E/flutter (15888): #20 GestureBinding._flushPointerEventQueue binding.dart:314 E/flutter (15888): #21 GestureBinding._handlePointerDataPacket binding.dart:295 E/flutter (15888): #22 _invoke1 (dart:ui/hooks.dart:164:13) E/flutter (15888): #23 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:361:7) E/flutter (15888): #24 _dispatchPointerDataPacket (dart:ui/hooks.dart:91:31) E/flutter (15888):</pre> <p>我尝试了很多参考资料，告诉我将代码中的端口更改为 127.0.0.1 或 10.0.2.2，但仍然遇到相同的错误</p> <pre class="lang-dart prettyprint-override"><code>import 'package:mysql1/mysql1.dart'; class Mysql { Future<MySqlConnection> getConnection() async { var settings = ConnectionSettings( host: 'localhost', port: 3306, user: 'root', password: '', db: 'company'); return await MySqlConnection.connect(settings); } } </code></pre> <p>这是我用来从用户获取数据的代码</p> <pre class="lang-dart prettyprint-override"><code> void _getCustomer() { db.getConnection().then((conn) { String sql = 'select mail from company.customer where id = 10;'; conn.query(sql).then((results) { for (var row in results) { setState(() { mail = row[0]; print(row[0]); }); print(results); } }); }); } </code></pre> <p>那里没有打印任何内容</p> <p>这是我的 SQL Server 配置并且它正在运行 </p> <p>尝试重新启动 SQL Server，但仍然得到相同的结果。但是当我尝试在我的工作台上使用相同的命令时，肯定会给我一个响应</p>