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In a django model custom save() method, how should you identify a new object?
I want to trigger a special action in the save() method of a Django model object when I'm saving a new record (not updating an existing record.)
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How to add hyperlink in JLabel?
What is the best way to add a hyperlink in a JLabel? I can get the view using html tags, but how to open the browser when the user clicks on it?
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Patterns for handling batch operations in REST web services?
What proven design patterns exist for batch operations on resources within a REST style web service?
8 Answers
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Semantic Diff Utilities [closed]
I'm trying to find some good examples of semantic diff/merge utilities. The traditional paradigm of comparing source code files works by comparing lines and characters.. but are there any utilities out there (for any language) that actually consider the structure of code when comparing files?
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getApplication() vs. getApplicationContext()
I couldn't find a satisfying answer to this, so here we go: what's the deal with Activity/Service.getApplication() and Context.getApplicationContext() ?
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Should I learn C before learning C++? [closed]
I visited a university CS department open day today and in the labs tour we sat down to play with a couple of final-year projects from undergraduate students. One was particularly good - a sort of FPS asteroids game. I decided to take a peek in the src directory to find it was done in C++ (most of...
linux上SVN conflict冲突解决的办法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...改了同一个文件的相同位置？Bing！冲突来了。
工程师A修改了a.txt的第一行，提交了。
工程师B也修改了a.txt的第一行，然后执行svn up，这时SVN提示了：（以下，你开始扮演工程师B的角色了）
$ svn up
在 “a.txt” 中发现冲突...
What's the difference between %s and %d in Python string formatting?
I don't understand what %s and %d do and how they work.
12 Answers
12
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What are MVP and MVC and what is the difference?
When looking beyond the RAD (drag-drop and configure) way of building user interfaces that many tools encourage you are likely to come across three design patterns called Model-View-Controller , Model-View-Presenter and Model-View-ViewModel . My question has three parts to it:
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How do I create a unique constraint that also allows nulls?
I want to have a unique constraint on a column which I am going to populate with GUIDs. However, my data contains null values for this columns. How do I create the constraint that allows multiple null values?
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