Question

我尝试一次保存一组图像。这些图像保存成功，但每个图像都有一个名称+路径。这个数据保存在MySQL数据库中，但问题是保存过程重复多次。这意味着如果我保存两张图片，我会在数据库中发现图片已经保存了四次。

这种类型的图像：

现在，如果我选择两个图像并单击发送按钮，我将在数据库 4 行中找到图像的名称。第一个和第二个是唯一字段，另外两个是第二个的重复名称。




void main() {
  runApp(
    MyApp(),

  );
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: PickImages(),
    );
  }
}
class PickImages extends StatefulWidget {
  @override
  _PickImagesState createState() => _PickImagesState();
}

class _PickImagesState extends State<PickImages> {
  static final String uploadEndPoint = 'https://******************.php';
  List<Object> images = List<Object>();
  Future<File> _imageFile;
  bool _isVisible = false;
  String base64Image;
  List imagecode=[];
  List name=[];
  Future _onAddImageClick(int index, int type) async {
    if (images != null)
      setState(() {
        // ignore: deprecated_member_use
        _imageFile = ImagePicker.pickImage(
          source: type == 1 ? ImageSource.camera : ImageSource.gallery,
          imageQuality: 50,
        );
        getFileImage(index);
      });
  }

  void getFileImage(int index) async {
    _imageFile.then((file) async {
      setState(() {
        ImageUploadModel imageUpload = new ImageUploadModel();
        imageUpload.imageFile = file;
        images.replaceRange(index, index + 1, [imageUpload]);
      });
    });
  }

  void showImageBox() {
    setState(() {
      _isVisible = !_isVisible;
    });
  }

  @override
  void initState() {
    super.initState();
    setState(() {
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
      images.add("Add Image");
    });
  }


  startUpload() {
    for(int i=0;i<imagecode.length;i++){
      http.post(uploadEndPoint, body: {
        "image": imagecode[i],
        "NameImage": name[i],

      }).then((result) {
        print('showall ${ imagecode[i]}');
        if (result.statusCode == 200) {
          print('anydata ${result.statusCode}');
        } else {

        }
      });
    }
  }


  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Post Images'),
      ),
      body: Column(
        children: <Widget>[
          Container(
            //padding: EdgeInsets.only(right: 5),
            child: Card(
              elevation: 5,
              child: ListTile(
                trailing: Icon(Icons.attachment),
                title: Text('Attachments'),
                onTap: () {
                  showImageBox();
                },
              ),
            ),
          ),
          Visibility(
            visible: _isVisible,
            child: Padding(
              padding: const EdgeInsets.only(top: 5.0, right: 5.0),
              child: GridView.count(
                shrinkWrap: true,
                crossAxisCount: 3,
                childAspectRatio: 1,
                children: List.generate(images.length, (index) {
                  if (images[index] is ImageUploadModel) {
                    ImageUploadModel uploadModel = images[index];
                    if(uploadModel.imageFile!=null){

                      //base64 image
                      List<int> imageBytes = uploadModel.imageFile.readAsBytesSync();
                      // base64Image = base64Encode(snapshot.data.readAsBytesSync());
                      base64Image = base64Encode(imageBytes); //'base64Image' holds the base64 image string
                      imagecode.add(base64Image);
                      name.add(uploadModel.imageFile.path.split("/").last);}
                    return Card(
                      clipBehavior: Clip.antiAlias,
                      child: Stack(
                        children: <Widget>[
                          Image.file(
                            uploadModel.imageFile,
                            fit: BoxFit.cover,
                            width: 300,
                            height: 300,
                          ),
                          Positioned(
                            right: 5,
                            top: 5,
                            child: InkWell(
                              child: Icon(
                                Icons.remove_circle,
                                size: 20,
                                color: Colors.red,
                              ),
                              onTap: () {
                                setState(() {
                                  images.replaceRange(
                                      index, index + 1, ['Add Image']);
                                });
                              },
                            ),
                          ),

                        ],
                      ),
                    );
                  } else {
                    return Card(
                      child: IconButton(
                        icon: Icon(Icons.camera_alt),
                        onPressed: () {
                          showModalBottomSheet(
                            context: context,
                            builder: (BuildContext context) {
                              return SafeArea(
                                child: Container(
                                  child: new Wrap(
                                    children: <Widget>[
                                      new ListTile(
                                        leading: new Icon(Icons.photo_camera),
                                        title: new Text('Camera'),
                                        onTap: () {
                                          _onAddImageClick(index, 1);
                                          Navigator.of(context).pop();
                                        },
                                      ),
                                      new ListTile(
                                          leading:
                                          new Icon(Icons.photo_library),
                                          title: new Text('Gallery'),
                                          onTap: () {
                                            _onAddImageClick(index, 2);
                                            Navigator.of(context).pop();
                                          }),
                                    ],
                                  ),
                                ),
                              );
                            },
                          );
                        },
                      ),
                    );
                  }
                }),
              ),
            ),
          ),
          RaisedButton(
            child: Text('send'),
            onPressed: () {
              startUpload();
            },
          ),
        ],
      ),
    );
  }
}

class ImageUploadModel {
  File imageFile;

  ImageUploadModel({
    this.imageFile,
  });
}

Answer 1

在您的代码中的某处，您可能会将条目复制到您正在迭代发送的列表中，您可以通过使用 HashMap 而不是使用地图键作为您正在使用的唯一值来避免这种麻烦作为键名 + 路径。

从颤振插入后数据库中的数据重复

1 个答案: