I did not able to store json response from API in sqflite database but i already parsed json response in list and also i stored similar data in sqflite database.
To stored locally i got success and able to perform CRUD operation and sending it to server, similarly i also able to perform CRUD operation on API data but problem arises on synchronization between local and json data.
the below code id for calling json data
Future<List<Activities>> getData() async {
List<Activities> list;
var res = await http
.post("http://xxxx/get-activity", headers: {
HttpHeaders.authorizationHeader: "Bearer " + _token.toString()
});
if (res.statusCode == 200) {
var data = json.decode(res.body);
var rest = data["data"] as List;
// print(rest);
list = rest.map<Activities>((json) => Activities.fromJson(json)).toList();
// print('okay, ${rest[0]}!');
} else {
print('something error');
}
print("List Size: ${list.length}");
return list;
}
solved
var data = json.decode(res.body);
var activities= data["data"] as List;
for (var activity in activities) {
Activity actData = Activity.fromMap(activity);
batch.insert(actTable, actData.toMap());
}
Solution! Please use this flutter plugin json_store
Related
I have flutter app where user input data and that data is stored on mysql.
Everything works perfect on my PHP, HTML on web. But in flutter I can't get session of user.
Future getData() async {
var url = 'https://azer.maverus.ba/api/read.php';
var response = await http.get(Uri.parse(url));
return json.decode(response.body);
}
I have that script and it read only data that I type inside flutter. And can't read data from database from curent user.
You have to add header to pass Authorization key to the API check the code below
Future getData() async {
var url = 'https://azer.maverus.ba/api/read.php';
var response = await http.get(Uri.parse(url),headers: <String, String>{
"Authorization" : "YOUR KEY HERE"
});
return json.decode(response.body);
}
I have this API where go to fetch data.
For each "date" I have a JSON Object.
What I want to do is fetch objects from let's say 5 years and get them on the same final JSON http response.
So I don't have to display only a day at the time.
Future<List<Schedule>> getFromEspnSchedule(String sport) async {
final url = 'http://myserver.com/api/$date'; //the $date would be e.g. 2010, 2011, 2012, ...
final response = await http.get(url);
if (response.statusCode == 200) {
List jsonResponse = json.decode(response.body);
return jsonResponse.map((data) {
return new Schedule.fromJson(data);
}).toList();
}
}
What is the best way to implement this?
If your API returns just a single Schedule object, you need to modify your method to get a single element.
Future<Schedule> getFromEspnSchedule(String sport) async {
final url = 'http://myserver.com/api/$date';
final response = await http.get(url);
if (response.statusCode == 200) {
return Schedule.fromJson(json.decode(response.body));
} else {
// make sure you return API error here
}
}
After you do this, you can go ahead and chain this into multiple calls made at the same time to achieve getting the data faster:
List<Schedule> responseList = await Future.wait([
getFromEspnSchedule('football'),
getFromEspnSchedule('volleyball'),
getFromEspnSchedule('basketball'),
getFromEspnSchedule('chess'),
]);
// responseList objects are listed the same way they are called above.
Schedule footballSchedule = responseList[0];
Schedule volleyballSchedule = responseList[1];
Schedule basketballSchedule = responseList[2];
Schedule chessSchedule = responseList[3];
I've create Board List function by fetching json url via flutter
First I've crated into window exe it works properly like this below
But when I want to production via chrome or android
It is not working as this below
This is my code to fetch json url what did I do wrong?
Future<List<Schedule>> fetchBoardList() async {
final response = await http.get('http://192.168.10.109:8888/mcschedule/machine/');
String logResponse = response.statusCode.toString();
if (response.statusCode == 200){
//print('ResponseStatusCode: $logResponse'); // Check Status Code = 200
//print('ResponseBody: ' + response.body); // Read Data in Array
List<dynamic> responseJson = json.decode(response.body);
return responseJson.map((e) => new Schedule.fromJson(e)).toList();
} else {
throw Exception('error :(');
}
}
I am working in NodeJS with CouchDB 2.1.1.
I'm using the http.request() method to set various config settings using the CouchDB API.
Here's their API reference, yes, I've read it:
Configuration API
Here's an example of a working request to set the logging level:
const http = require('http');
var configOptions = {
host: 'localhost',
path: '/_node/couchdb#localhost/_config/',
port:5984,
header: {
'Content-Type': 'application/json'
}
};
function setLogLevel(){
configOptions.path = configOptions.path+'log/level';
configOptions.method = 'PUT';
var responseString = '';
var req = http.request(configOptions, function(res){
res.on("data", function (data) {
responseString += data;
});
res.on("end", function () {
console.log("oldLogLevel: " + responseString);
});
});
var data = '\"critical\"';
req.write(data);
req.end();
}
setLogLevel();
I had to escape all the quotes and such, which was expected.
Now I'm trying to get CouchDb to accept a setting for compaction.
The problem is that I'm attempting to replicate this same request to a different setting but that setting doesn't have a simple structure, though it appears to be "just a String" as well.
The CouchDB API is yelling at me about invalid JSON formats and I've tried a boatload of escape sequences and attempts to parse the JSON in various ways to get it to behave the way I think it should.
I can use Chrome's Advanced Rest Client to send this payload, and it is successful:
Request Method: PUT
Request URL: http://localhost:5984/_node/couchdb#localhost/_config/compactions/_default
Request Body: "[{db_fragmentation, \"70%\"}, {view_fragmentation, \"60%\"}, {from, \"23:00\"}, {to, \"04:00\"}]"
This returns a "200 OK"
When I execute the following function in my node app, I get a response of:
{"error":"bad_request","reason":"invalid UTF-8 JSON"}
function setCompaction(){
configOptions.path = configOptions.path+'compactions/_default';
configOptions.method = 'PUT';
var responseString = '';
var req = http.request(configOptions, function(res){
res.on("data", function (data) {
responseString += data;
});
res.on("end", function () {
console.log("oldCompaction: " + responseString);
});
});
var data = "\"[{db_fragmentation, \"70%\"}, {view_fragmentation, \"60%\"}, {from, \"23:00\"}, {to, \"04:00\"}]\"";
req.write(data);
req.end();
}
Can someone point at what I'm missing here?
Thanks in advance.
You need to use node's JSON module to prepare the data for transport:
var data = '[{db_fragmentation, "70%"}, {view_fragmentation, "60%"}, {from, "23:00"}, {to, "04:00"}]';
// Show the formatted data for the requests' payload.
JSON.stringify(data);
> '"[{db_fragmentation, \\"70%\\"}, {view_fragmentation, \\"60%\\"}, {from, \\"23:
00\\"}, {to, \\"04:00\\"}]"'
// Format data for the payload.
req.write(JSON.stringify(data));
I want to send file and json data from HttpClient to web api server.
I cant seem to access the json in the server via the payload, only as a json var.
public class RegulationFilesController : BaseApiController
{
public void PostFile(RegulationFileDto dto)
{
//the dto is null here
}
}
here is the client:
using (var client = new HttpClient())
{
using (var content = new MultipartFormDataContent())
{
client.BaseAddress = new Uri(ConfigurationManager.AppSettings["ApiHost"]);
content.Add(new StreamContent(File.OpenRead(#"C:\\Chair.png")), "Chair", "Chair.png");
var parameters = new RegulationFileDto
{
ExternalAccountId = "1234",
};
JavaScriptSerializer serializer = new JavaScriptSerializer();
content.Add(new StringContent(serializer.Serialize(parameters), Encoding.UTF8, "application/json"));
var resTask = client.PostAsync("api/RegulationFiles", content); //?ApiKey=24Option_key
resTask.Wait();
resTask.ContinueWith(async responseTask =>
{
var res = await responseTask.Result.Content.ReadAsStringAsync();
}
);
}
}
this example will work:HttpClient Multipart Form Post in C#
but only via the form-data and not payload.
Can you please suggest how to access the file and the submitted json And the file at the same request?
Thanks
I have tried many different ways to submit both file data and metadata and this is the best approach I have found:
Don't use MultipartFormDataContent, use only StreamContent for the file data. This way you can stream the file upload so you don't take up too much RAM on the server. MultipartFormDataContent requires you to load the entire request into memory and then save the files to a local storage somewhere. By streaming, you also have the benefit of copying the stream into other locations such as an Azure storage container.
This solves the issue of the binary data, and now for the metadata. For this, use a custom header and serialize your JSON into that. Your controller can read the custom header and deserialize it as your metadata dto. There is a size limit to headers, see here (8-16KB), which is a large amount of data. If you need more space, you could do two separate requests, one to POST the minimum need, and then a PATCH to update any properties that needed more than a header could fit.
Sample code:
public class RegulationFilesController : BaseApiController
{
public async Task<IHttpActionResult> Post()
{
var isMultipart = this.Request.Content.IsMimeMultipartContent();
if (isMultipart)
{
return this.BadRequest("Only binary uploads are accepted.");
}
var headerDto = this.GetJsonDataHeader<RegulationFileDto>();
if(headerDto == null)
{
return this.BadRequest("Missing X-JsonData header.");
}
using (var stream = await this.Request.Content.ReadAsStreamAsync())
{
if (stream == null || stream.Length == 0)
{
return this.BadRequest("Invalid binary data.");
}
//save stream to disk or copy to another stream
var model = new RegulationFile(headerDto);
//save your model to the database
var dto = new RegulationFileDto(model);
var uri = new Uri("NEW URI HERE");
return this.Created(uri, dto);
}
}
private T GetJsonDataHeader<T>()
{
IEnumerable<string> headerCollection;
if (!this.Request.Headers.TryGetValues("X-JsonData", out headerCollection))
{
return default(T);
}
var headerItems = headerCollection.ToList();
if (headerItems.Count() != 1)
{
return default(T);
}
var meta = headerItems.FirstOrDefault();
return !string.IsNullOrWhiteSpace(meta) ? JsonConvert.DeserializeObject<T>(meta) : default(T);
}
}