Is it possible to append an already existing file/object in open stack swift.
If Yes, which version of swift supports it.
Also is it possible to boost the read/write performance in swift.
The answer to your first question is no. You cannot append to an existing object in Object Storage. You can only replace the object that is there.
The answer to your second question is too broad and vague to be answered in this forum.
Related
This question has been asked a few times on stack but I am not finding a solution for my particular situation and I have been stuck for a few hours now.
My question is: How do I Fetch, Update and Save a record Using Core Data?
edit: This question has been modified to fit the title, which is what influenced the only answer that was received. Since Stack Overflow advises against deleting posts so I decided to revise this one to benefit future readers.
Documentation to create a new core data entity in swift.
Documentation to save an NSManagedObjectContext in swift.
To change the value of settingsSwitch simply change it to what it is not... so add that code to your didChangeSwitchState function.
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I have been trying to learn scala. One thing that I have noticed is the quality of the docs. They seem to miss out on a lot of methods. Is this intentional? I feel like I am missing something because they can't be this bad.
For example:
Blog post on reading files with scala. The blog post recommends using a scala.io.Source.fromFile(..) method to read a file. It provides an iterator. Looks very nice to use. I want to get a better understanding of the class, so I go to the scala docs on scala.io.Source.
No where in the docs does it show the method for scala.io.Source.fromFile(..). When I go to my IDE, it does try to autocomplete Source.fromFile(..), and it even works in the code.
This happened to me before when I was trying to use scala's database api. Am I missing something? Is there a secret button that pulls up this method? Have I gone my whole life being blind without realizing it? Or are the scaladocs really this bad?
fromFile is not a method of class Source, it's a method of object Source. I.e. you can't write
val source: Source = ...
source.fromFile(...)
You are looking at the documentation for the class, which doesn't list the object's methods.
The link to the object's documentation is the circle with C near the class name at the top.
What is meant by Core Data in iPhone? Why we need it? What is the basic methods in it?
Thanks in Advance
It is essentially an ORM for the iPhone SDK, allowing you to define objects that act as a model which can be created, updated, and deleted through the use of OO and without writing SQL.
If you want more detail I would suggest accepting answers on your other posts like others have already suggested.
I need some understanding about using Core Data.
Can it be used to save and retrieve all of my objects used in my program?
Is there any simple example demonstrating this ?
I am having hard time finding one online.
Thanks for any replies.
They have to be managed objects, but you can convert them all to be - it's just that you still have to define the data model for them.
This might not be the answer you ultimately vote up or mark as accepted, but it may prove useful if you haven't seen it already:
Apple: Core Data
I found it endlessly useful personally.
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Closed 10 years ago.
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Relational UML Diagram inspired by SO
I have developed my homework from the post.
Problem: to do posts similarly as in SO so that the first post is the question and the other posts are replies after the question.
Question: How would you improve the interfaces? Would some simpler data structure make things easier?
Your first question confuses me. UML makes me think of objects and "Posts-table" makes me think of relational databases. Which one do you mean? I'll assume that you want objects.
You need an interface or abstraction that represents both questions and answers - maybe that's the Post interface. It'll have attributes like text and author and a timestamp when it was posted.
Since the question will never come before an answer, if you have a collection of Post instances it'll be in the proper order if you sort it by timestamp.
UPDATE: UML means object-oriented programming. Python is both an object-oriented and a functional language. So that means you'll be thinking about the problem in terms of objects first.
Thinking in terms of objects means setting aside concerns about user interface and database. You design the objects to provide the kind of behavior that you need. You can have a simple text interface at first, and object serialization will do for persistence. But get the objects right first.
When you say "interface", I think of Java interfaces. They declare the signature of the class, but say nothing about implementation. So your Post interface might have Question and Answer implementations.
What contains all the Post instances? What owns them? I'd have another object called KnowledgeExchange to own the collection of Posts. Let it hide all the implementation details and provide methods to getQuestion and getAnswers. Don't force your clients to have to know all those details or even whether or not you implement it as a stack or list.
Like I said, don't worry about tables or persistence just yet. Think about objects. Best to make the whole problem in terms of objects instead of just Post, Question, and Answer.