I am learning PhoneGap for an app project and need to use the database for certain aspects, I am trying out the Nova Data framework,
https://cordova.codeplex.com/wikipage?title=How%20to%20use%20nova.data
I am trying to use my code to put together a test entity, but I am getting a db error telling me there is a missing table. The documentation does not specify that the database should be created beforehand, but I am starting to think that may be the case. Has anyone out there used the Nova framework in a project? I just need a little guidance.
Here is my code I am using to kick off the DB Context:
var DataContext = function () {
nova.data.DbContext.call(this, "HealthDb", "1.0", "Health DB", 1000000);
this.Temperatures = new nova.data.Repository(this, Temperature, "Temperatures");
};
DataContext.prototype = new nova.data.DbContext();
DataContext.constructor = DataContext;
And my entity (Temperature) :
var Temperature = function () {
nova.data.Entity.call(this);
this.Value = 101;
};
Temperature.prototype = new nova.data.Entity();
Temperature.constructor = Temperature;
It is creating an empty database with the proper name, just no tables! I am grateful for any assistance!
Thanks for using our library. I have made the html5 sqlite as a standalone library. Please get it from github.
A live demo link is also available there. And the documentation is more complete. The lib itself has also been updated and a few bugs fixed.
Thanks,
Leo
Turns out I was trying to start up the dbcontext before I defined my entity classes....
Changed the order of my js files and it works.
Related
I am trying to set up an ASP.NET Core 3.1 Web API to test the elk stack using Serilog v2.9 and Serilog.Sinks.Elasticsearch v8.0.1. This is all new to me and I'm just trying to figure things out. I seem to have everything working and can log simple things all day long and see them in both ES and Kibana. Trouble is I can't seem to destructure anything except anonymous types. To illustrate:
var data = new
{
SampleData = "Hello World!"
};
_logger.LogInformation("Destructured anonymous object: {#data}", data);
Produces the expected result. A nice shiny log entry with the object "data" serialized perfectly. Whereas:
var test = new TestClass
{
Guid = Guid.NewGuid(),
Timestamp = DateTime.UtcNow,
Title = "Testing this serialization!"
};
_logger.LogInformation("Destructred discrete type. {#test}", test);
Produces nothing at all. No exception, no entry in ElasticSearch. Nothing. TestClass is a simple class with only those 3 properties, all of which should serialize just fine. I can't figure this out. Here is my LoggerConfiguration:
Log.Logger = new LoggerConfiguration()
.Enrich.FromLogContext()
.Enrich.WithExceptionDetails()
.WriteTo.Elasticsearch(new ElasticsearchSinkOptions(new Uri(elasticUri))
{
AutoRegisterTemplate = true,
AutoRegisterTemplateVersion = AutoRegisterTemplateVersion.ESv6,
CustomFormatter = new ExceptionAsObjectJsonFormatter(renderMessage: true)
})
.CreateLogger();
What am I missing? Do I have to like, produce a property map or something to destructre non-anonymous objects? Is .Net Core 3.1 too new? I'm at a loss. Every example I've seen online says this should be working.
I finally figured this out after banging my head against the problem for a few more hours. My problem is that I was using the plain old Serilog NuGet Package instead of Serilog.AspNetCore. Once I installed the latter it began working as expected.
Welp. I hope this might help anyone else in my position who is following along with the otherwise excellent guide here: https://www.humankode.com/asp-net-core/logging-with-elasticsearch-kibana-asp-net-core-and-docker
EF People,
My understanding is that the newly made public APIs for metadata will allow us to add enough metadata in to the model so that TVF can be called and be composable.
If anyone can point me in the right direction I would greatly appreciate it. Without Composable TVF I have to jump through some major work a rounds.
From looking at the unit test it looks like something a long this line of thought:
var functionImport = EdmFunction.Create()
"Foo", "Bar", DataSpace.CSpace,
new EdmFunctionPayload
{
IsComposable = true,
IsFunctionImport = true,
ReturnParameters = new[]
{
FunctionParameter.Create("functionname", EdmType.GetBuiltInType()
EdmConstants.ReturnType,
TypeUsage.Create(collectionTypeMock.Object),
ParameterMode.ReturnValue),
}
});
...
entityContainer.AddFunctionImport(functionImport);
Thanks,
Brian F
Yes, it is now possible in EF6.1. I actually created a custom model convention which allows using store functions in CodeFirst using the newly opened mapping API. The convention is available on NuGet http://www.nuget.org/packages/EntityFramework.CodeFirstStoreFunctions. Here is the link to the blogpost containing all the details: http://blog.3d-logic.com/2014/04/09/support-for-store-functions-tvfs-and-stored-procs-in-entity-framework-6-1/. The project is open source and you can get sources here: https://codefirstfunctions.codeplex.com/
I want to create a very simple query to look up a sqlite db using greendao. 2 fields, one is the ID and the other 'affirmation'.
i am sorry to be such a beginner, but i am not sure how to use greendao including what to import etc.. All i have been able to do so far is add the greendao libraries but i cant find a good tutorial to just do a query. Basically i want it to be a random ID that calls up a random affirmation and return it to my main activity.. Once again i am sorry but i am really trying and getting nowhere..
Greendao is a ORM-framework. If you don't know what this means you should look up this first.
Greendao generally works as follows:
You create a java-project that generates your sourcecode for your real app. You have to include DaoCore and DaoGenerator in this project.
You add the generated sourcecode to your android-project and include DaoCore in it. DaoGemerator is not neccessary.
For examples how to generate the code and define your entities the greendao-website is a good place to go.
According to your description you need an entity with id-property and a string-property (affirmation).
In your android-project you then use the DevOpenHelper to get a session and from the session you can get the dao (Data Access Object) for your entity. The dao includes the very basic query to load data by id (load ()).
Please notice that the DevOpenHelper is only meant for development process. For your final release you should extend OpenHelper and costumize your actions to be taken on DB-schema update.
Here is some example code I have in my application.
DaoHelper.getInstance().getDaoSession().clear();
OperationDao dao = DaoHelper.getInstance().getDaoSession().getOperationDao();
String userId = "some id"
WhereCondition wc1 = new WhereCondition.PropertyCondition(OperationDao.Properties.UserId,
" = " + userId);
WhereCondition wc2 = new WhereCondition.PropertyCondition(OperationDao.Properties.Priority,
" > " + 4);
// Uncached is important if your data may have changed recently.
List<Operation> answer = dao.queryBuilder().where(wc1, wc2).listLazyUncached();
This is a decent tutorial on how to learn greendao. Make sure you follow the links to the further parts.
You can use:
daoMaster = new DaoMaster(db);
daoSession = daoMaster.newSession();
yourDao = daoSession.getYourDao();
Random() random = new Random();
List<YourObject> objects = yourDao.loadAll();
YourObject yourObject = objects.get(random.nextInt(objects.size());
i am using db4o 8 with c# 3.5, The TA and TP is enabled on all of my domain model classes.
the problem is i have my own ID Generator attached to creating event with following code:
IEventRegistry eventRegistry = EventRegistryFactory.ForObjectContainer(Container);
eventRegistry.Creating += new EventHandler(eventRegistry_Creating);
i have a USER class containing a list of ORDER.
problem is if i update the USER class, creating event does not fire for new added ORDER objects in USER.ORDERS.
before version 8 i used v7.4 and it worked fine, but today i upgraded it to v8 to gain some performance benefits but this problem occurred.
would you please help me to fix this problem ?
I tried to reproduce the issue and it worked for me fine. Are you sure that the added order is actually stored? What kind of collection are you using? The db4o activatable collections or the regular CLR collections? And which version did you use?
Here my little test-case which worked:
var eventRegistry = EventRegistryFactory.ForObjectContainer(container);
var expectFireCreated = false;
eventRegistry.Created += (sender, args) =>
{
expectFireCreated = true;
};
var costumer = (from Constumer c in container
select c).First();
costumer.Orders.Add(new Order("55"));
container.Commit();
Assert.IsTrue(expectFireCreated);
I am using EF4 Self Tracking Entities (VS2010 Beta 2 CTP 2 plus new T4 generator). But when I try to update entity information it does not update to database as expected.
I setup 2 service calls. one for GetResource(int id) which return a resource object. the second call is SaveResource(Resource res); here is the code.
public Resource GetResource(int id)
{
using (var dc = new MyEntities())
{
return dc.Resources.Where(d => d.ResourceId == id).SingleOrDefault();
}
}
public void SaveResource(Resource res)
{
using (var dc = new MyEntities())
{
dc.Resources.ApplyChanges(res);
dc.SaveChanges();
// Nothing save to database.
}
}
//Windows Console Client Calls
var res = service.GetResource(1);
res.Description = "New Change"; // Not updating...
service.SaveResource(res);
// does not change anything.
It seems to me that ChangeTracker.State is always show as "Unchanged".
anything wrong in this code?
This is probably a long shot... but:
I assume your Service is actually in another Tier? If you are testing in the same tier you will have problems.
Self Tracking Entities (STEs) don't record changes until when they are connected to an ObjectContext, the idea is that if they are connected to a ObjectContext it can record changes for them and there is no point doing the same work twice.
STEs start tracking once they are deserialized on the client using WCF, i.e. once they are materialized to a tier without an ObjectContext.
If you look through the generated code you should be able to see how to turn tracking on manually too.
Hope this helps
Alex
You have to share assembly with STEs between client and service - that is the main point. Then when adding service reference make sure that "Reuse types in referenced assemblies" is checked.
The reason for this is that STEs contain logic which cannot be transfered by "Add service reference", so you have to share these types to have tracing logic on client as well.
After reading the following tip from Daniel Simmons, the STE starts tracking. Here is the link for the full article. http://msdn.microsoft.com/en-us/magazine/ee335715.aspx
Make certain to reuse the Self-Tracking Entity template’s generated entity code on your client. If you use proxy code generated by Add Service Reference in Visual Studio or some other tool, things look right for the most part, but you will discover that the entities don’t actually keep track of their changes on the client.
so in the client make sure you don't use add service reference to get the proxy instead access service through following code.
var svc = new ChannelFactory<IMyService>("BasicHttpBinding_IMyService").CreateChannel();
var res = svc.GetResource(1);
If you are using STEs without WCF you may have to call StartTracking() manually.
I had the same exact problem and found the solution.
It appears that for the self-tracking entities to automatically start tracking, you need to reference your STE project before adding the service reference.
This way Visual Studio generates some .datasource files which does the final trick.
I found the solution here:
http://blogs.u2u.be/diederik/post/2010/05/18/Self-Tracking-Entities-with-Validation-and-Tracking-State-Change-Notification.aspx
As for starting the tracking manually, it seems that you do not have these methods on the client-side.
Hope it helps...