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Questions tagged [object-persistence]

147 questions
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Using Persistent Store in BlackBerry

I am developing a BlackBerry application. I want to store the details of multiple users in my mobile. I have to store data like username, first name, last name ,email id ,phone number for each user. Can any one please provide me a sample code for…
user469999
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ASP.Net EF not updating relationships

I've got a table which contains a bunch of assets that are organized into multiple hierarchies such that the table has a many-to-many relationship with itself (each asset can have multiple children AND multiple parents). I'm using the following…
Trevor
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Fine-grained object model in hibernate

In the Hibernate in Action (Manning publication), A major objective of the Hibernate project is support for fine-grained object models, which we isolated as the most important requirement for rich domain model. In crude term, fine-grained means…
Abimaran Kugathasan
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db4o multiple store() and one close() doesn't work?

Hi I'm using db4o in an android application. I want to store multiple objects in a database so I have a loop that adds my objects in the db but if I don't put the close() IN the loop (after each store()), all the objects won't persist the next time…
Alexis
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DB4O close() wipe the DB?

I'm using db4o to store different objects in an android application. I get json contents from a sever then them into Objects (contacts here) that I store in a db4o file. ObjectContainer mainDB = Db4oEmbedded.openFile(dbConfig(),…
Alexis
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Load Object from MongoDB with JPA (hibernate)

I created an @Entity and stored it in a MongoDB via Hibernate using the Java Peristence API (JPA) to be able to switch to another JPA implementation (like DataNucleus, EclipseLink etc.), but now I cannot load it in anymore. I get:…
loresIpsos
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Which is better - relying on delegates or persisting through objects - iOS

After doing some reading I notice Apple pushes the use of delegates on controllers communicating with one another. So say I have a Menu controller which needs to communicate with the help controller (and they need to share info - lol don't ask me…
dbobrowski
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Restarting app without worrying about onSaveInstanceState

How do I simply just restart my ENTIRE app instead of trying to worry about saving the instance perfectly in onSaveInstanceState and reinitializing everything perfectly when resumed/restored in onRestoreInstanceState? (this can quickly become error…
zdanman
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How do I persist data managed by NSArrayController without Core Data or NSKeyedArchiver?

I hope you'll excuse the seemingly broad nature of this question, but it gets quite specific. I'm building a document-based Cocoa application that works like most others except that I am using SQLCipher for my data store (a variant of SQLite),…
Billy Gray
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In python, how to make a list or dictionary persist across sessions without being overwritten immediately the code is run?

This is my first question on StackOverflow so please excuse any deficiencies. I am trying to make a leaderboard for a game. It needs to add +1 to the rankings for the player that beats the game, then save the rankings to a file. I've tried playing…
SAnderson
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How to retry a lock wait timeout using java persistence?

I need some clarification on the right way to retry a "retryable" exception (e.g. something like lock wait timeout) when using java persistence. For example, with pseudocode like: EntityTransaction tx = em.getTransaction(); tx.begin(); for (a bunch…
denishaskin
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How to save the values if the app when its closed

i am new to iPhone programming.. my app is just like a quiz.. it has different type of quizs and many question in each quiz type i want to save the values like strings(quiz name) and integers(question number) when an application is closed so when…
rockey
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Second level Cache in hibernate disabled by default

The session factory Cache needs to be explicitly configured in hibernate to fine tune the query performances. Is there a relevant reason that can be agreed upon, why first level Cache(session specific) is enabled out of the box in hibernate while…
Karma-yogi
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Are POCO objects just "persistent ignorant" or something more?

RPM1984 in this question speaks about POCO are "persistent ignorant" objects. But he doen´t speak about how much logic can hold. For example: class Person { public string FirstName { get; set; } } Or this: class Person { private string…
Andoni Ripoll Jarauta
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cPickle class with data save to file

I've big class in Python it's "DataBase-like" class. I want to save it to file - all including data. This is input(example to show the issue, in script database is like 10000 records): import cPickle # DataBase-like class class DataBase: class…
Rafal
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