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How do I update if exists, insert if not (AKA “upsert” or “merge”) in MySQL?
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191
Use INSERT ... ON DUPLICATE KEY UPDATE. For example:
INSERT INTO `usage`
(`thing_id`, `times_...
UILabel with text of two different colors
...ame
value:[UIColor redColor]
range:NSMakeRange(10, 1)];
[label setAttributedText: text];
I created a UILabel extension to do it.
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Django connection to PostgreSQL: “Peer authentication failed”
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221
I took a peek at the exception, noticed it had to do with my connection settings. Went back to s...
How does one make a Zip bomb?
...the Wikipedia page on the topic. The article mentions an example of a 45.1 kb zip file that decompresses to 1.3 exabytes.
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Convert character to ASCII code in JavaScript
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Plot logarithmic axes with matplotlib in python
...de would look like:
import pylab
import matplotlib.pyplot as plt
a = [pow(10, i) for i in range(10)]
fig = plt.figure()
ax = fig.add_subplot(2, 1, 1)
line, = ax.plot(a, color='blue', lw=2)
ax.set_yscale('log')
pylab.show()
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Calling clojure from java
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167
Update: Since this answer was posted, some of the tools available have changed. After the orig...
How do you add an array to another array in Ruby and not end up with a multi-dimensional result?
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17 Answers
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c++提取复数的实部和虚部 - C/C++ - 清泛网 - 专注C/C++及内核技术
...p, 0, sizeof(COMPLEX));
char buf[MAX_BUF_LEN];
int signPos = -1, // +/-号位置
iPos = -1; // 结尾的i的位置
for (int i = len-1; i >-1; i--)
{
if ('i' == strCplx[i])
iPos = i;
else if ('+' == strCplx[i] || '-' == strCplx[...
How to position a div in the middle of the screen when the page is bigger than the screen
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16 Answers
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