I have always seen that in all tutorials, databases are made in the form of code-first, but already there is a sqlite database that I want to use in my project. And I want to use entity 7 too. To do so, I made some classes from my database by means of a dll but it didn't work. In fact, I made these classes so that I could use my own database. I didn't want it to create a new database. Any suggestions? Can you recommend me any links,because I couldn't find any useful link
I install Install-Package EntityFramework.SQLite –Pre and Install-Package EntityFramework.Commands –Pre and Install-Package SQLite.Net.Async-PCL /next step: with Extension ،SQL Server Compact/SQLite Toolbox generate classes from db and import my db into project in visual studio and set buildaction to content and in final add
private async Task CopyDatabase()
{
bool isDatabaseExisting = false;
try
{
StorageFile storageFile = await ApplicationData.Current.LocalFolder.GetFileAsync("people.db");
isDatabaseExisting = true;
}
catch
{
isDatabaseExisting = false;
}
if (!isDatabaseExisting)
{
StorageFile databaseFile = await Package.Current.InstalledLocation.GetFileAsync("people.db");
await databaseFile.CopyAsync(ApplicationData.Current.LocalFolder);
}
}
into pp.xaml
Related
I developed demo web app with Flutter and upload it on my server and I used Hive database to store some data on web app.
Recently I found that when I open web app and store some data on it,
if I use different browser again I can't see the previously stored data,
it seems that Hive on Flutter web will store data somewhere on client side cache.
I have 3 questions now:
Where is the location of hive database and how can I access it manually?
How can I fix this problem and store data on my server with Flutter web that every user could see the same data?
Should I use Dart for server side to achieve this goal? If yes, where can I start and find good documents?
Here is my code to save and load data:
void _initHiveDB() async {
if (_isDBInited) {
return;
}
if(!kIsWeb){
final documentsDirectory = await Path_Provider.getApplicationDocumentsDirectory();
Hive.init(documentsDirectory.path);
}
Hive.registerAdapter(ComplaintModelAdapter(), 0);
_isDBInited = true;
}
Future<bool> saveNewComplaint(ComplaintModel complaintModel)async{
try{
if(_complaintBox==null||!_complaintBox.isOpen){
_complaintBox = await Hive.openBox('Complaints');
}
else{
_complaintBox = Hive.box('Complaints');
}
_complaintBox.add(complaintModel);
return true;
}
catch(exc){
return false;
}
}
Future<List<ComplaintModel>> loadAllComplaints() async {
try{
if(_complaintBox==null||!_complaintBox.isOpen){
_complaintBox = await Hive.openBox('Complaints');
}
else{
_complaintBox = Hive.box('Complaints');
}
//Box<ComplaintModel> complaintBox = await Hive.openBox('Complaints');
//Box<ComplaintModel> complaintBox = await Hive.box('Complaints');
List<ComplaintModel> complaints = _complaintBox.values.toList();
return complaints;
}
catch(exc){
return null;
}}
Hive does its job correctly, it is an embedded database and must have different databases for different browsers. If you need this information to be shared in the cloud you should look for another type of database. A cloud database would be the solution. There are free solutions among the google tools for example, or to create your API connecting to a Database SQL for example.
I have a .net core 3.0 application using the Microsoft.Azure.Batch 12.0.0 C# nuget package.
I create a job containing one task with a resource file like this (pseudo codeish):
var source = ResourceFile.FromStorageContainerUrl(settings.Input.Container.GetAccessUrl());
var cloudTask = new CloudTask(_taskId, commandline)
{
...
ResourceFiles = new[] { source, },
...
}
await _batchClient.JobOperations.AddTaskAsync("jobid", cloudTask,
cancellationToken: cancellationToken);
when i now request the status of the task
var cloudJob = await _batchClient.JobOperations.GetJobAsync("jobId", cancellationToken:
cancellationToken);
var cloudTask = cloudJob.ListTasks().SingleOrDefault();
var code = cloudTask.ExecutionInformation.FailureInformation,Code
code can be of value "ResourceContainerAccessDenied" if indeed we do not have access to the ResourceCondainer - "ResourceContainerAccessDenied" is not
a member of Microsoft.Azure.Batch.Common.TaskFailureInformationCodes and not documented anywhere as far as i can see.
Is this a bug in the Azure Batch C# SDK? Am i overlooking something? Where can i get a list of all possible code values?
The fact that this error code is not included in the C# SDK is indeed a bug.
I will be fixing this bug as part of an upcoming SDK release (ETA ~1 week).
I have a problem creating a unit test with EF Core (2.0.1).
I create my db with the following options:
var options = new DbContextOptionsBuilder<MyContext>()
.UseInMemoryDatabase(Guid.NewGuid().ToString())
.ConfigureWarnings((b) =>
{
b.Ignore(InMemoryEventId.TransactionIgnoredWarning);
})
.Options;
The code I want to test looks something like this:
using (IDbContextTransaction transaction = await context.Database.BeginTransactionAsync())
{
await context.Database.ExecuteSqlCommandAsync("DELETE FROM fooSchema.Customers WHERE ID = {0}", id);
await context.SaveChangesAsync();
// Other stuff...
context.Customers.Add(fooCustomer);
await context.SaveChangesAsync();
}
First I had the issue with InMemory not supporting transactions. I solved it using ConfigureWarnings as shown in the code. But then it turns out InMemory doesn't handle ExecuteSqlCommandAsync. So then I tried SQLLite, but it doesn't handle custom schemas instead.
How do I create a DbContext, without any "real" DB, that handles transactions, schema and ExecuteSqlCommandAsync?
It is OK to suppress the error from ExecuteSqlCommandAsync. But I cannot find the EventId for it. In reality it works great, this is just for the unit test.
strong text [Plugin error at Note entity][1]
[1]: http://i.stack.imgur.com/hRIi9.png
Hi,Anyone resolved my issue i got a Plug-in error which i worked at Update of "Note" entity.Basically i want a Plugin which converted pre-exiting Note attachment XML file into new .MMP extension file with the same name.
I have done following procedure firstly i created a "Converter_Code.cs" dll which contains Convert() method that converted XML file to .MMP file here is the constructor of the class.
public Converter(string xml, string defaultMapFileName, bool isForWeb)
{
Xml = xml;
DefaultMapFileName = defaultMapFileName;
Result = Environment.NewLine;
IsForWeb = isForWeb;
IsMapConverted = false;
ResultFolder = CreateResultFolder(MmcGlobal.ResultFolder);
}
In ConvertPlugin.cs Plug-in class firstly i retrieved Note entity attachment XML file in a string using following method in
IPluginExecutionContext context =(IPluginExecutionContext)serviceProvider.
GetService (typeof(IPluginExecutionContext));
IOrganizationServiceFactory serviceFactory= (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
IOrganizationService service = serviceFactory.CreateOrganizationService
(context.UserId);
if (context.InputParameters.Contains("Target")
&& context.InputParameters["Target"] is Entity)
{
// Obtain the target entity from the input parameters.
Entity entity = (Entity)context.InputParameters["Target"];
var annotationid = entity.GetAttributeValue<Guid>("annotationid");
if (entity.LogicalName != "annotation")
{
return;
}
else
{
try
{
//retrieve annotation file
QueryExpression Notes = new QueryExpression { EntityName ="annotation"
,ColumnSet = new ColumnSet("filename", "subject", "annotationid",
"documentbody") };
Notes.Criteria.AddCondition("annotationid", ConditionOperator.Equal,
annotationid);
EntityCollection NotesRetrieve = service.RetrieveMultiple(Notes);
if (NotesRetrieve != null && NotesRetrieve.Entities.Count > 0)
{
{
//converting document body content to bytes
byte[] fill = Convert.FromBase64String(NotesRetrieve.Entities[0]
.Attributes["documentbody"].ToString());
//Converting to String
string content = System.Text.Encoding.UTF8.GetString(fill);
Converter objConverter = new Converter(content, "TestMap", true);
objConverter.Convert();
}
}
}
catch (FaultException<OrganizationServiceFault> ex)
{
throw new InvalidPluginExecutionException("something is going wrong");
}
}
}
}
and than A string is passed to "Converter" constructor as a parameter.
finally i merged all dll using ILMerge following method:
ilmerge /out:NewConvertPlugin.dll ConvertPlugin.dll Converter_Code.dll
and NewConvertPlugin is registered successfully but while its working its generate following error:
Unexpected exception from plug-in (Execute): ConverterPlugin.Class1: System.Security.SecurityException: That assembly does not allow partially trusted callers.
i also debug the plugin using Error-log but its not worked so i could not get a reason whats going wrong.
The error is caused by the library you merged inside your plugin.
First of all you are using CRM Online (from your screenshot) and with CRM Online you can use only register plugins inside sandbox.
Sandbox means that your plugins are limited and they run in a partial-trust environment.
You merged an external library that requires full-trust permissions, so your plugin can't work and this is the reason of your error.
Because you are in CRM Online, or you find another library (the Converter) that requires only partial-trust, hoping that the merge process will work, or you include (if you have it) the source code of the converter library directly inside your plugin.
I am trying to make a very simple application that looks up values in a database by using polymer elements to get input.
My main polymer class looks like this:
library index;
import 'package:polymer/polymer.dart';
import 'lookup.dart';
import 'dart:html';
#CustomTag('auth-input')
class AuthInput extends PolymerElement {
#observable String username = '';
#observable String password = '';
AuthInput.created() : super.created();
void login(Event e, var detail, Node target)
{
int code = (e as KeyboardEvent).keyCode;
switch (code) {
case 13:
{
Database.lookUp(username, password);
break;
}
}
}
}
and a secondary database helper class looks like this:
library database;
import 'package:mongo_dart/mongo_dart.dart';
class Database {
static void lookUp(String username, String password) {
print("Trying to look up username: " + username + " and password: " + password);
DbCollection collection;
Db db = new Db("mongodb://127.0.0.1/main");
db.open();
collection = db.collection("auth_data");
var val = collection.findOne(where.eq("username", username));
print(val);
db.close();
}
}
I keep getting this error and I cannot think of a way around it:
The requested built-in library is not available on Dartium.'package:mongo_dart/mongo_dart.dart': error: line 6 pos 1: library handler failed
import 'dart:io';
The strange thing is, I don't want to use dart:io. The code works fine either running database processes or running polymer processes. I can't get them to work together. I don't see why this implementation of the code will not run.
The first line at https://pub.dartlang.org/packages/mongo_dart says
Server-side driver library for MongoDb implemented in pure Dart.
This means you can't use it in the browser. Your error message indicates the same. The code in the package uses dart:io and therefore can't be used in the browser.
Also mongodb://127.0.0.1/main is not an URL that can be used from within the browser.
You need a server application that does the DB access and provides an HTTP/WebSocket API to your browser client.