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Postgres and Indexes on Foreign Keys and Primary Keys
...he referencing table for
rows matching the old value, it is often a good idea to index the
referencing columns. Because this is not always needed, and there are
many choices available on how to index, declaration of a foreign key
constraint does not automatically create an index on the refer...
What's so bad about Template Haskell?
...l, on the other hand, is just macros. It's not abstraction at the level of ideas, but abstraction at the level of ASTs, which is better, but only modestly, than abstraction at the level of plain text.*
It ties you to GHC. In theory another compiler could implement it, but in practice I doubt this wi...
Frame Buster Buster … buster code needed
...iframe your site just to take a peek at it, though not to allow use of it. Ideally, I think a screenshot of the site's homepage should be used, with some explanation of why it can't be used in the iframe overlaid on top.
– wheresrhys
Feb 11 '10 at 18:19
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What is the documents directory (NSDocumentDirectory)?
...n't use the approach with @"~/Documents". Hardcoding paths is never a good idea. It may work now, but if Apple ever chooses to rename or move the Documents directory, your app will break. NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); will always give you the correc...
Difference between Covariance & Contra-variance
...and I rephrased following examples.
What does “consistency” mean? The idea is to design type-safe type hierarchies with highly substitutable types. The key to get this consistency is sub type based conformance, if you work in a statically typed language. (We'll discuss the Liskov Substitution P...
ImageUtil 扩展：图像工具扩展，提供图像处理和变换功能 · App Inventor 2 中文网
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ImageUtil 扩展
ImageUtil 是一个非可视扩展，为内置的 Image 组件提供额外的图像处理工具。
包名：com.gordonlu.imageutil.aix
版本：5
发布日期：2022年3月8日
最低 API：19 (Android 4.4 KitKat)
下载链...
Simultaneously merge multiple data.frames in a list
...
yes. whenever i have an idea, i always check if @hadley has already done it, and most of the times he has :-)
– Ramnath
Nov 11 '11 at 15:33
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How to emulate GPS location in the Android Emulator?
...his looks so awesome I think Google should tell the world about it. Simple ideas are always the best. Why did no one think of this?
– tiktak
Mar 28 '14 at 19:24
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How do I focus on one spec in jasmine.js?
... expect(true).toBeFalsy();
});
});
However, I don't really like the idea of editing my tests (fit and fdescribe) to run them selectively. I prefer to use a test runner like karma which can filter out tests using a regular expression.
Here's an example using grunt.
$ grunt karma:dev watch --...
Identity increment is jumping in SQL Server database
...option 'ResetOrderIdentityAfterRestart', 'startup', 'on';
This is a good idea if you have few tables. but if you have to do for many tables, this method still works but not a good idea.
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