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Storing Image Data for offline web application (client-side storage database)

I have an offline web application using appcaching. I need to provide it about 10MB - 20MB of data that it will save (client-side) consisting mainly of PNG image files. The operation is as follows: ...
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What is the difference between BIT and TINYINT in MySQL?

In which cases would you use which? Is there much of a difference? Which I typically used by persistence engines to store booleans? ...
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Rails: Using build with a has_one association in rails

In this example, I create a user with no profile , then later on create a profile for that user. I tried using build with a has_one association but that blew up. The only way I see this working is using has_many . The user is supposed to only have at most one profile . ...
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What is the difference between persist() and merge() in JPA and Hibernate?

...e entered into the database at or before transaction commit or as a result of the flush operation. If X is a preexisting managed entity, it is ignored by the persist operation. However, the persist operation is cascaded to entities referenced by X, if the relationships from X to th...
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Add margin above top ListView item (and below last) in Android

This is a pretty fine question about the layout of items in a ListView in Android. 5 Answers ...
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What is the difference between '>' and a space in CSS selectors?

What's the point using this syntax 5 Answers 5 ...
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Create list of single item repeated N times

... You can also write: [e] * n You should note that if e is for example an empty list you get a list with n references to the same list, not n independent empty lists. Performance testing At first glance it seems that repeat...
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Django-DB-Migrations: cannot ALTER TABLE because it has pending trigger events

I want to remove null=True from a TextField: 5 Answers 5 ...
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Anonymous recursive PHP functions

Is it possible to have a PHP function that is both recursive and anonymous? This is my attempt to get it to work, but it doesn't pass in the function name. ...
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What does it mean for a data structure to be “intrusive”?

I've seen the term intrusive used to describe data structures like lists and stacks, but what does it mean? 2 Answers ...