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我正在做学校项目，它需要在浏览器中显示一些来自 mysql 数据库的简单数据。我读过，SQLJocky 在浏览器中不起作用，所以我决定让它像服务器客户端应用程序并在服务器端运行 db（在这里获得灵感：https ://dart-lang.github.io/server/codelab /）。但它没有用，无法创建带有消息的客户端 api：

*in ShutdownIsolate: Unhandled exception:
IsolateSpawnException: Unable to spawn isolate: Unhandled exception:
Load Error for "package:sqljocky/sqljocky.dart": No mapping for 'sqljocky' package when resolving 'package:sqljocky/sqljocky.dart'.
#0      _asyncLoadErrorCallback (dart:_builtin:155)
#1      _asyncLoadError (dart:_builtin:566)
#2      _loadPackage (dart:_builtin:605)
#3      _loadData (dart:_builtin:637)
#4      _loadDataAsync (dart:_builtin:657)
#5      _loadScriptCallback (dart:_builtin:153)
#6      _handleLoaderReply (dart:_builtin:370)
#7      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)
'file:///home/alenka/dart-pokusy/server-side-app/one-hour-codelab/server/7-serve/lib/server/dbConnector.dart': error: line 1 pos 1: library handler failed
import 'package:sqljocky/sqljocky.dart';
^
#0      Isolate.spawnUri.<spawnUri_async_body> (dart:isolate-patch/isolate_patch.dart)
#1      _asyncErrorWrapperHelper.<anonymous closure> (dart:async-patch/async_patch.dart:34)
#2      _RootZone.runBinary (dart:async/zone.dart:1154)
#3      _Future._propagateToListeners.handleError (dart:async/future_impl.dart:579)
#4      _Future._propagateToListeners (dart:async/future_impl.dart:641)
#5      _Future._completeError (dart:async/future_impl.dart:432)
#6      _SyncCompleter._completeError (dart:async/future_impl.dart:56)
#7      _Completer.completeError (dart:async/future_impl.dart:27)
#8      Isolate._spawnCommon.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:439)
#9      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:148)*

有谁知道如何解决这个问题，或者如何以不同的方式从浏览器中的数据库获取数据？

添加的代码包含来自 SQLJocky 的内容：

`import 'package:sqljocky/sqljocky.dart';
 import 'dart:async';
...
  @ApiMethod(path: 'connect')
  Future<List<String>> dbConnect() async {
    List<String> rows = [];
    print('called dbConnect');
    var pool = new ConnectionPool(
        host: 'localhost',
        port: 3306,
        user: "root",
        password: null,
        db: 'project',
        max: 5);
    print('connection created');
    var results = await pool.query('select * from User');
    print('gonna write something from db');
    results.forEach( (row){
      print('Name: ${row[0]}, password: ${row[1]}');
      rows.add('Name: ${row[0]}, password: ${row[1]}');
    });
    return rows;
  }
`
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1 回答 1

0

将您的服务器端代码和客户端代码隔离到具有自己的 pubspec.yaml 的单独项目中。

我发现当两者都在 pubspec.yaml 中时，sqljocky 不能与某些客户端库配合使用。

于 2017-09-07T21:30:56.923 回答