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Fastest check if row exists in PostgreSQL
...nch of rows that I need to insert into table, but these inserts are always done in batches. So I want to check if a single row from the batch exists in the table because then I know they all were inserted.
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Why can't C# interfaces contain fields?
...ar interface and that all implementations will contain the field Year . Does this mean that every implementation has to separately declare Year ? Wouldn't it be nicer to simply define this in the interface?
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Maintain git repo inside another git repo
...y: it won't push all content of repoA: only A plus a reference to B. But I don't criticize your answer, I was rushing writing pretty much the same when I re-read the OP's question ;)
– VonC
Jan 11 '11 at 16:06
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CSS checkbox input styling
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With CSS 2 you can do this:
input[type='checkbox'] { ... }
This should be pretty widely supported by now. See support for browsers
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How to get the day of week and the month of the year?
I don't know much about Javascript, and the other questions I found are related to operations on dates, not only getting the information as I need it.
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android pick images from gallery
...tyForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE);
Don't forget also to create the constant PICK_IMAGE, so you can recognize when the user comes back from the image gallery Activity:
public static final int PICK_IMAGE = 1;
@Override
public void onActivityResult(int requestC...
Jenkins Git Plugin: How to build specific tag?
...s to build a specified tag. The tag is part of a parametrized build, but I do not know how to pass this through to the git plugin to just build that tag. This has been taking 3 hours of my day and I have conceded defeat to the masters at stack overflow.
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In which situations do we need to write the __autoreleasing ownership qualifier under ARC?
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You're right. As the official documentation explains:
__autoreleasing to denote arguments that are passed by reference (id *) and are autoreleased on return.
All of this is very well explained in the ARC transition guide.
In your NSError example, t...
Node.js and CPU intensive requests
...ue is the workers can be written in a different language. Just pop a task, do the work, and write the response back.
something like this https://github.com/resque/resque
Here is an article from github about why they built it http://github.com/blog/542-introducing-resque
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How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?
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If you find yourself doing things like this regularly it may be worth investigating the object-oriented interface to matplotlib. In your case:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(5)
y = np.exp(x)
fig1, ax1 = plt.sub...