difference between firebase .on("value") and .once("value") - firebase-realtime-database

On updating a child firebase runs one more time when using ".once" to fetch the value from firebase and add a new row in application. But when using ".on" the code works on updating a child But not working on adding a new child as it removes the row from application though it adds to the firebase But we are able to view that only when we refreshes the page. My question here is what to how to fetch new data from firebase after adding or updating.

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Entity framework on updating model giving an error

I am trying to update the model by selecting a newly added stored procedure, till now I have added with out any issues but when I am adding the one which is newly created I am getting an error as attached
Can some one help me. If i remove all the code inside stored procedure and adding then it is adding to the model but not with the code I want

iOS-How to keep update Sqlite Database with new version

In my new version add some new table and some new fields is existing .How to save to crashed and keep update with new version.
When you application working with sqlite, before insert/update data in to table you can check that new row is already exist on table or not. if not you can add it new row in existing table.
Same way Table already exist or not you can check before any operation in table.Bashed on that you can create new table or update in existing one.
You have to do some logics to maintain the version updates.
First in your new version, check the code(Xcode) version number with the App Store version by using this code, refer check current app version. (Apple api is available)
If the version mismatches, then you have to update the database and get all the datas from server whichever needed for new version.
This process you have to check in appdelegate.
Note: Instead of api call, you can store the version number in the database, and compare the Xcode version.

CoreData Issue: There was an error creating or loading the application's saved data

My CoreData Worked before when I had an entity with one attribute called test, I tried to add a new attribute in the data model and I also defined it in my data.swift file but when I launch the application, it crashes on the loading screen every time, what am I not doing right? I can provide my code as needed.
When you run the application and then change the CoreDataModel, the next time you run the application it will give you an error indicating that the data model used has changed. To fix this, you can either remove the old version from the simulator (or device) and run the app again, or you can create a new CoreData version.
If just testing before the app has been released, deleting and running the app again works fine...

update sqlite table on next release ios

I have created a table on my app. On the next build I am adding some more column and changing the name of one column.
Because the table is already created it will not create the table again, hence the changes are also not get reflected.
How to deal with this problem? please help me..

dhtmlxScheduler using ASP.NET MVC Refresh Error

I am getting an error about incorrect html when I return from the Save view which means the displayed scheduler is not being refreshed to fix the last set of data. Having made a change or addition, it is displayed correctly if I close the website and open it again, so the update has been saved in the table. It is just the refreshing of the currennt view that I am having problems with. Does anybody have any suggestions as to where I might look?
As usual, this was my mistake. I had created a new project and copied the Save.aspx view from another project. The Inherits="System.Web.Mvc.ViewPage<RLSBCWebSite.Controllers.CalendarActionResponseModel>" still referred to the old project.
Make sure you create a new page in your project and copy just the contenets from old projects!

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