The persistence tag has no wiki summary.
3
votes
1answer
285 views
Patterns for a tree of persistent data with multiple storage options?
I have a real-world problem which I'll try to abstract into an illustrative example.
So imagine I have data objects in a tree, where parent objects can access children, and children can access ...
2
votes
3answers
172 views
Does 'consider returning Null Object' apply to a DAO read method?
I was looking for an answer to the question of what the dao should return when a search end up to be for a nn entity that does not exist.
There are some generic previous questions related to ...
0
votes
1answer
64 views
The best approach to building a mobile service that's also available when the connection drops?
Hopefully this question will be a good suit for P.SE since it is a whiteboard-level 'how can this be done' conceptual question.
I'm trying to build a product that needs to be available to someone on ...
3
votes
4answers
302 views
Is storing types in the database an anti pattern?
A little background on where this question is coming from. In my current .NET application I'm working on some features related to archiving a certain type of business entity called a "Project". ...
3
votes
5answers
230 views
Senior team members want to move query-relevant persistent data from DB to cache. Does this make sense?
I am a young engineer recently employed at a small company that sells products to the general public. We use Ruby On Rails and MySQL. Our database has a lot of customer data, but a great deal more of ...
15
votes
9answers
1k views
Should I try persistence in flat file before database?
Somebody explained to me that since in agile development, policy and the application logic should be more important than details such as persistence method, persistence decision should be taken at the ...
5
votes
3answers
169 views
How do I design a DAL when I have to deal with relationships?
Say I'm developing a bug tracker, where a ticket belongs to at most one milestone, and a milestone can have many tickets. When a milestone is deleted (from the database), all tickets associated with ...
7
votes
2answers
280 views
Persisting natural language processing parsed data
I've recently started experimenting with natural language processing (NLP) using Stanford's CoreNLP, and I'm wondering what are some of the standard ways to store NLP parsed data for something like a ...
1
vote
1answer
221 views
Sample domain model for online store
We are a group of 4 software development students currently studying at the Cape Peninsula University of Technology. Currently, we are tasked with developing a web application that functions as a ...
2
votes
1answer
90 views
Separating validation from persistence in models?
Models in an MVC application gets kind of hard to test when validation of data and persistence of data is baked together in the model. I would like to test those separately to prevent doing ...
2
votes
2answers
364 views
Caching factory design
I have a factory class XFactory that creates objects of class X. Instances of X are very large, so the main purpose of the factory is to cache them, as transparently to the client code as possible. ...
4
votes
3answers
296 views
Clojure state and persistence
I'm learning Clojure to see if it's something I can leverage at my current job, and more importantly, how I can convince my bosses that Clojure has a 'killer feature' over java that makes it worth the ...
5
votes
2answers
475 views
Are Persistence-Ignorant objects able to implement lazy loading?
Persistence Ignorance is an application of single responsibility principle, which in practice means that Domain Objects (DO) shouldn't contain code related to persistence, instead they should only ...
1
vote
1answer
172 views
Best Persistence choice for J2EE-App with frequently changing Data Model [closed]
Whenever I develop a J2EE-Application, I at some point decide to switch from my dummy Persistence (Simply Using Lists and other Data Structures) to some Sort of Database Persistence. Mostly when I ...
1
vote
1answer
158 views
Are separate business objects needed when persistent data can be stored in a usable format?
I have a system where data is stored in a persistent store and read by a server application. Some of this data is only ever seen by the server, but some of it is passed through unaltered to clients.
...
0
votes
1answer
217 views
What is a good design pattern and terminology for decoupling output? [closed]
I have a program where I want to save some data record. And I want the output type to be flexible such that I could save the data record to a text file, xml file, database, push to a webservice.
My ...
0
votes
2answers
132 views
Persistent Storage format for (update+read)-intensive data
I am developing a Java application. While using the application, data would be generated that needs to be stored on disk. I am looking for an embedded database appropriate for a average use-case of ...
16
votes
6answers
837 views
INI files or Registry or personal files?
I want to save the configuration of my project which includes
Screen size
Screen position
Folder paths
Users settings and so on.
The standard places where you can save these are configuration ...
4
votes
3answers
269 views
Strategy for backwards compatibility of persistent storage
In my experience, trying to ensure that new versions of an application retain compatibility with data storage from previous versions can often be a painful process.
What I currently do is to save a ...
5
votes
2answers
270 views
How to define the seams between the domain layer and a database full of stored procedures?
We have a legacy database full of stored procedures.
These stored procedures are somewhat CRUD-categorized but upon inspection of some procedures, they are not "simple" as they might update, delete, ...
3
votes
2answers
2k views
Is Spring + Hibernate prefered instead of EJB 3?
It is my perception that whenever new JEE projects start (where these technologies would be applicable), people prefer to use a combination of Spring + Hibernate instead of EJB 3.
It seems junior ...
3
votes
1answer
254 views
ORM Tools and advantages of circular references in entities
Let me demonstrate a simple example,
Class Organization
ID type Number,
Name type String,
HAS A -> Collection
Class Facility
ID type Number,
Name type String,
...
6
votes
4answers
494 views
Does EF mean you might never have to use SQL or design database tables again?
Does Entity Framework mean you might never have to use SQL or design database tables again?
Is this what "persistence ignorance" means?
I am new to EF and ORMs in general, and I would like to ...
3
votes
4answers
536 views
Which framework is durable and has a HA message bus?
I'm looking for a messaging framework for a distributed financial application that should meet the following requirements:
No data loss or duplication, hence, a message should be sent exactly once ...
4
votes
2answers
149 views
What are the different considerations to make when determining persistent data format? [duplicate]
I've recently been struggling with the concept of what file structure to use when creating save-files for a desktop applications. When I say "save-files" I mean something like *.doc files. Files that ...
1
vote
1answer
277 views
WPF: Reloading app parts to handle persistence as well as memory management
I created a app using Microsoft's WPF. It mostly handles data reading and input as well as associating relations between data within specific parameters.
As a total beginner I made some bad design ...
